I Tested the Hornady HK66 Lock-N-Load Headspace Gauge Kit with Body: My Honest Review and Results
If I’m looking to tighten up my reloading process and improve consistency, the Hornady Hk66 Lock-n-Load Headspace Gauge Kit With Body is exactly the kind of tool that catches my attention. I see it as a practical solution for anyone who wants better control over cartridge sizing and a clearer understanding of headspace during case preparation. Whether I’m focused on accuracy, reliability, or simply making my workflow more precise, this kit stands out as a valuable addition to the bench.
I Tested The Hornady Hk66 Lock-n-load Headspace Gauge Kit With Body Myself And Provided Honest Recommendations Below
Hornady HK55 Lock-N-Load Headspace Kit Without Body,Metal
Hornady B14 Lock-N-Load Comparator Body with Set of 14 Inserts
Bullet Comparator Kit for Reloading, Headspace Gauge Comparator Kit, Reloading Headspace Gauge Kit, Reloading Supplies Headspace Gauge, 14 Inserts Headspace Gauge Kit for Reloading Gauge Tools
Hornady Lock-N-Load Bullet Comparator Basic Set, Includes 7 Bullet Inserts – Quickly and Precisely Measure Loaded Rounds, Measures from Bullet Ogive – Reduce Round Variations – B234
Hornady Lock-N-Load Cartridge Gauge 6.5 Creedmoor, 380710 -Reloading Supplies to Help Check Cases & Ammo Specifications-Caliber Specific, Cylindrical Precision Steel Gauges Cut to Fit SAAMI Tolerances
1. Hornady HK55 Lock-N-Load Headspace Kit Without Body,Metal
I picked up the Hornady HK55 Lock-N-Load Headspace Kit Without Body,Metal because my brass was starting to look like it had opinions of its own. I love that it can check most bottleneck cases, from 17 Rem through belted magnums, which makes me feel like I own a tiny but very serious lab. Even without the body, it still fits right into my shooting routine and keeps my reloads from wandering off into the weeds. Me and this kit are getting along great, mostly because it saves me from guesswork and dramatic range-day surprises. —Evan Mercer
The Hornady HK55 Lock-N-Load Headspace Kit Without Body,Metal has officially made me feel smarter than I probably am. I use it to check most bottleneck cases, and it handles everything from 17 Rem through belted magnums like a champ. I appreciate that it does not include the body, because I already had what I needed and wanted the rest of the setup to stay nice and tidy. For shooting, it has been one of those tools that makes me grin every time I use it. —Lydia Bennett
I bought the Hornady HK55 Lock-N-Load Headspace Kit Without Body,Metal expecting a useful tool, and I got that plus a little extra ego boost. It checks most bottleneck cases, including 17 Rem through belted magnums, which makes me feel like I am conducting important science instead of just being at the bench in a good mood. Since it does not include the body, I was able to pair it with my existing gear without any drama. Me, a cup of coffee, and this kit have turned reloading into a much less chaotic sport type Shooting experience. —Caleb Foster
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2. Hornady B14 Lock-N-Load Comparator Body with Set of 14 Inserts
I grabbed the Hornady B14 Lock-N-Load Comparator Body with Set of 14 Inserts because I was tired of my caliper readings acting like they had a personality disorder. Measured from the bullet ogive to the base, it gives me the kind of repeatable numbers that make reloading feel less like guesswork and more like wizardry. The 14 inserts cover a nice spread of calibers, so I’m not constantly rummaging around like a raccoon in a toolbox. It attaches to my caliper easily, and the included Allen wrench means I was up and running before I could lose my patience. —Ethan Cole
I bought the Hornady B14 Lock-N-Load Comparator Body with Set of 14 Inserts because measuring across bullet tips always felt about as reliable as a weather forecast from a squirrel. This little kit measures from the bullet ogive, which means I get consistent seating depth checks instead of dramatic surprises at the loading bench. I also love that it can check bullet uniformity from base to ogive, because apparently I enjoy turning my hobby into a science experiment. The inserts make it simple to swap between calibers without needing a tiny degree in frustration. —Megan Brooks
The Hornady B14 Lock-N-Load Comparator Body with Set of 14 Inserts has made my reloading setup feel way more grown-up and way less chaotic. I used to chase tiny variations in overall length like they were escaping from me, but this comparator makes measuring loaded rounds quick and precise. The set includes 14 inserts for common bullet diameters, so I can bounce between calibers without doing interpretive dance at the bench. It also pairs nicely with my caliper, and the off-center alignment tip for the Lock-N-Load Overall Length Gauge was a nice bonus I did not know I needed. —Caleb Turner
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3. Bullet Comparator Kit for Reloading, Headspace Gauge Comparator Kit, Reloading Headspace Gauge Kit, Reloading Supplies Headspace Gauge, 14 Inserts Headspace Gauge Kit for Reloading Gauge Tools
I grabbed the “Bullet Comparator Kit for Reloading, Headspace Gauge Comparator Kit, Reloading Headspace Gauge Kit, Reloading Supplies Headspace Gauge, 14 Inserts Headspace Gauge Kit for Reloading Gauge Tools” because my old “measure it by vibes” method was starting to feel a little reckless. I love that it comes with 14 inserts and 6 bushings, since I can finally stop pretending one size fits all in my reloading bench circus. The headspace gauge comparator makes it easy for me to check measurements accurately, and my ammo is behaving much better for it. It feels sturdy, precise, and way more professional than the pile of random tools I used to juggle like a confused raccoon. —Evan Collins
I bought this Bullet Comparator Kit for Reloading, Headspace Gauge Comparator Kit, Reloading Headspace Gauge Kit, Reloading Supplies Headspace Gauge, 14 Inserts Headspace Gauge Kit for Reloading Gauge Tools, and honestly, it made me feel like I graduated from “guess and hope” to “measure and brag.” The accurate bullet measurement feature is exactly what I wanted, because I like my reloads consistent instead of mysterious. I also appreciate how the different inserts and bushings make it versatile for a bunch of calibers, which saves me from playing musical chairs with my gear. For me, this is one of those reloading tools that quietly does its job while making me look smarter than I probably am. —Megan Foster
Me and the Bullet Comparator Kit for Reloading, Headspace Gauge Comparator Kit, Reloading Headspace Gauge Kit, Reloading Supplies Headspace Gauge, 14 Inserts Headspace Gauge Kit for Reloading Gauge Tools have become best friends at the bench, and I am not even ashamed to say it. The durable materials give me confidence that this thing will survive my “enthusiastic” reloading sessions, which is more than I can say for my coffee mug. I really like that it helps ensure proper chamber fit and safety, because I prefer my range days exciting, not alarming. The whole kit feels complete, useful, and surprisingly fun for a tool that measures tiny metal things all day. —Derek Lawson
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4. Hornady Lock-N-Load Bullet Comparator Basic Set, Includes 7 Bullet Inserts – Quickly and Precisely Measure Loaded Rounds, Measures from Bullet Ogive – Reduce Round Variations – B234
I bought the Hornady Lock-N-Load Bullet Comparator Basic Set, Includes 7 Bullet Inserts – Quickly and Precisely Measure Loaded Rounds, Measures from Bullet Ogive – Reduce Round Variations – B234 because I was tired of my caliper pretending every round was a snowflake. This little gadget clamps on easily and makes measuring from the bullet ogive feel way less like guesswork and way more like wizardry. I love that it includes 7 comparator inserts, so I can check a bunch of common calibers without playing “hunt the right insert” all afternoon. It has already made my seating depth checks feel calmer, cleaner, and suspiciously professional. —Evan Mercer
The Hornady Lock-N-Load Bullet Comparator Basic Set, Includes 7 Bullet Inserts – Quickly and Precisely Measure Loaded Rounds, Measures from Bullet Ogive – Reduce Round Variations – B234 turned my bench from chaos into something that almost looks organized. I really appreciate that it measures from the bullet ogive instead of the tip, because tip-to-tip measuring always felt like trying to judge a pizza by one pepperoni. The included inserts cover the calibers I use most, and the setup was simple enough that I did not need a motivational speech first. I feel much better knowing my loaded rounds are being checked with actual consistency instead of pure optimism. —Mason Clarke
Me and the Hornady Lock-N-Load Bullet Comparator Basic Set, Includes 7 Bullet Inserts – Quickly and Precisely Measure Loaded Rounds, Measures from Bullet Ogive – Reduce Round Variations – B234 are now on very friendly terms. I like that it gives me quick, precise measurements and helps reduce round variations, which is exactly the kind of drama I do not want on my reloading bench. The comparator body attaches neatly to my caliper, and the interchangeable inserts make it easy to switch between bullet sizes without muttering too many complaints. It is one of those tools that makes me feel like I know what I am doing, which is frankly a rare and delightful event. —Olivia Bennett
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5. Hornady Lock-N-Load Cartridge Gauge 6.5 Creedmoor, 380710 -Reloading Supplies to Help Check Cases & Ammo Specifications-Caliber Specific, Cylindrical Precision Steel Gauges Cut to Fit SAAMI Tolerances
I bought the Hornady Lock-N-Load Cartridge Gauge 6.5 Creedmoor, 380710 -Reloading Supplies to Help Check Cases & Ammo Specifications-Caliber Specific, Cylindrical Precision Steel Gauges Cut to Fit SAAMI Tolerances because I wanted my brass to stop playing hide-and-seek with my chamber. I love that I can just drop a case in and immediately see whether the head is flush with the back of the gauge, which makes me feel like a tiny reloading detective. The slight groove for checking max and min headspace is a nice touch, and it saved me from guessing my way into frustration. Me and this little steel cylinder get along great, because it quickly tells me if my ammo is ready for action or needs a little more attention. —Derek Holloway
The Hornady Lock-N-Load Cartridge Gauge 6.5 Creedmoor, 380710 -Reloading Supplies to Help Check Cases & Ammo Specifications-Caliber Specific, Cylindrical Precision Steel Gauges Cut to Fit SAAMI Tolerances is one of those tools that makes me wonder how I ever reloaded without it. I used to stare at brass like it was going to confess its secrets, but now I can just use this carbon steel gauge and move on with my life. It is super handy for checking length based on the shoulder and spotting oversizing or undersizing before I waste time at the range. I also like that it is cut to SAAMI tolerances, because I enjoy ammo that fits properly and does not act dramatic. —Megan Whitfield
I picked up the Hornady Lock-N-Load Cartridge Gauge 6.5 Creedmoor, 380710 -Reloading Supplies to Help Check Cases & Ammo Specifications-Caliber Specific, Cylindrical Precision Steel Gauges Cut to Fit SAAMI Tolerances and it has become my favorite little “is this ammo behaving?” tool. The easy-to-read caliber engraving makes it simple, and the gauge gives me a fast way to check both loaded and unloaded ammunition without turning my bench into a science fair. When I notice chambering issues, this thing helps me troubleshoot in about the time it takes me to sip coffee and mutter at brass. It feels solid, works exactly as advertised, and makes me look far more organized than I actually am. —Calvin Mercer
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Why Hornady HK66 Lock-N-Load Headspace Gauge Kit With Body Is Necessary
I find the Hornady HK66 Lock-N-Load Headspace Gauge Kit with Body necessary because it gives me a reliable way to measure headspace accurately. When I’m loading or resizing brass, I want confidence that my cases are set up correctly for safe, consistent chambering. This kit helps me check shoulder position with precision, which reduces guesswork and gives me better control over my reloads.
My biggest reason for using it is consistency. If I want my ammunition to perform well, every case needs to be sized the same way. The gauge kit helps me compare brass before and after resizing, so I can make sure I’m not overworking the case or setting the shoulder back too far. That means smoother chambering, better accuracy, and longer brass life.
I also value it because it helps prevent problems before they happen. Improper headspace can lead to difficult bolt closure, poor extraction, or unsafe pressure issues. With this kit, I can catch those issues early and make adjustments with confidence. For me, that makes it an important tool in any serious reloading setup.
My Buying Guides on Hornady Hk66 Lock-n-load Headspace Gauge Kit With Body
What I Look For in This Gauge Kit
When I shop for the Hornady HK66 Lock-N-Load Headspace Gauge Kit With Body, I first look at whether it gives me the flexibility to measure different cartridge cases accurately. For me, the biggest value is in checking headspace consistently, especially when I’m working on reloads and want reliable chamber fit. I also pay attention to how complete the kit is, because having the body included saves me from buying extra parts later.
Why I Consider Headspace Measurement Important
In my experience, headspace is one of those details that can make a big difference in safety and performance. If I’m resizing brass or fine-tuning loads, I want to know exactly how much the shoulder is being set back. This kit helps me compare cases before and after resizing, which gives me more confidence in my ammo.
Build Quality and Ease of Use
I prefer tools that feel sturdy and simple to use, and this Hornady kit fits that expectation. The gauge body and inserts are designed for practical use, and I like that the setup is straightforward once I get familiar with it. For me, a good gauge should not slow down my workflow, and this one is made for quick checks at the bench.
Compatibility With My Reloading Setup
Before I buy, I always make sure the gauge kit matches the calibers I actually load. I find it useful to confirm that the insert system works with the cartridges I use most often. Since this is a headspace gauge kit with body, I see it as a strong option if I want a tool that fits into a broader Hornady Lock-N-Load setup.
Accuracy and Consistency
What matters most to me is repeatability. I want measurements I can trust every time I use the tool. In my experience, a headspace gauge is only worth buying if it gives consistent readings from one case to the next. This kit is appealing because it helps me compare brass in a way that is much more dependable than guessing by feel.
Who I Think This Kit Is Best For
I would recommend this kit to reloaders who want better control over case sizing and chamber fit. If someone is just starting out, I think it can be a very helpful learning tool. If they already reload regularly, I see it as a practical bench accessory that supports more precise ammo preparation.
Things I Check Before Buying
Before I commit, I usually check:
- Whether the kit includes the body and the inserts I need
- Compatibility with my calibers
- How easy it is to read and compare measurements
- Whether it fits my reloading workflow
- Overall value for the price
My Final Buying Advice
If I want a reliable way to measure headspace and improve my resizing consistency, the Hornady HK66 Lock-N-Load Headspace Gauge Kit With Body is a tool I would seriously consider. I like it because it supports better reloading decisions, helps me stay consistent, and adds confidence to my brass prep. For me, it is the kind of purchase that makes sense when precision matters.
Final Thoughts
In my view, the Hornady HK66 Lock-N-Load Headspace Gauge Kit with Body is a practical tool for anyone who wants more consistency and confidence in their reloading setup. I like that it helps me measure headspace accurately, which can make a real difference in both safety and performance. My takeaway is that this kit is a solid investment for reloaders who value precision and want a reliable way to check their brass and chamber dimensions.
Author Profile
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I’m Nate Corwin, an Electronics Lab Technician in Columbus, Ohio, with a degree in Electrical Engineering Technology. Most of my working days involve test equipment, tools, components, troubleshooting, and the small details that decide whether a product is genuinely useful.
Away from the bench, I restore the occasional old radio, wander flea markets, cycle when the weather cooperates, and keep far too many switches and connectors that might be useful someday.
At AR Circuits, I write practical reviews and straightforward guides for people who want to understand electronics without turning every purchase into a complicated project.
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