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Hornady HK66 Lock-N-Load Headspace Gauge Kit with Body

4.8 4.8 out of 5 stars 563 ratings

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  • Includes lock n load headspace gauge, product manual
  • Extends brass life
  • Improves accuracy
  • Allows for comparisons between fire-formed brass and re-sized brass
  • Sport type: Shooting

From the manufacturer

comparator gauge with body

Lock-N-Load Headspace Comparator Body with 5 Bushing Set | Item #HK66

The Lock-N-Load Headspace Comparator extends brass life, improves accuracy, and enhances safety. The gauge measures variations in brass before and after firing or re-sizing. It allows for headspace comparison between fire-formed brass and re-sized brass.

The five bushings that come with the Lock-N-Load Headspace Comparator provide the ability to check most bottleneck cases, from .17 Rem through belted magnums. Ackley Improved chambers use the same bushing size as the parent case. See chart provided or consult product instructions for cartridge/bushing size details.

Determining the proper bushing diameter:

If you add the neck diameter and the shoulder diameter and divide that number by two, use the bushing closest to that number.

Headspace Bushings Chart
hornady logo

About Us

'Ten bullets through one hole' was the philosophy of Joyce Hornady, the company's founder.

Founded in 1949, Hornady Manufacturing has become a world-leading innovator of bullet, ammunition, reloading tool and accessory design and manufacturing. At Hornady, ammunition is more than their livelihood. It's a major part of their daily life.

Hornady acquired SnapSafe in 2015 to complement and expand their offerings in the security products market segment.

Product Description

The Lock N Load headspace gauge is the best method we've found to extend brass life, improve accuracy and enhance safety. The gauge measures variations in your brass before and after firing or resizing. It allows for comparison between fire-formed brass from your gun and your re-sized brass. Any of five interchangeable bushing are attached to your caliper using the same body as found on our Comparator. This kit comes with five bushings that allow the user to check most bottleneck cases, from .17Remington through the belted magnums. Ackley improved chambers use the same bushing as the parent case.

Product information

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Hornady HK66 Lock-N-Load Headspace Gauge Kit with Body


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Legal Disclaimer

This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Customer reviews

4.8 out of 5 stars
4.8 out of 5
563 global ratings

Customers say

Customers like the quality, ease of use, measurement, value, and accuracy of the product. For example, they mention it works great, it's simple to set up, and it provides very accurate measurements. That said, they say it'll help you set up your dies and is a great buy.

AI-generated from the text of customer reviews

56 customers mention56 positive0 negative

Customers are satisfied with the quality of the product. They mention it's a very useful product, works great, and is a good tool to have around. Customers also say it'll be a great addition for serious ammo reloaders.

"...Hornady makes good quality and it works well for me. I do recommend this product." Read more

"This set of headspace gauges are great. They're cheap, they work and they're light...." Read more

"...A very useful product, quality manufacture, with clear easily followed instructions. What else can you ask for??" Read more

"For the serious shooter these are well designed to help determine the proper head spaceing when reloading your bullets." Read more

17 customers mention17 positive0 negative

Customers find the product simple to use and clear in instructions. They also say it helps set up their case trimmer and figure out what cases need full case resizing.

"I like this tool. Easy to use and very accurate. I use it in conjunction with Hornady's caliper anvil...." Read more

"...It is pretty quick and easy but I think a few changes would make it even better...." Read more

"...A very useful product, quality manufacture, with clear easily followed instructions. What else can you ask for??" Read more

"...Once you figure it out they are awesome and quick! Helped me set up my case trimmer and figure out what cases needed full case resizing or just..." Read more

12 customers mention12 positive0 negative

Customers find the measurement of the product to be accurate, simple, and consistent. They also say it's great for measuring headspace, simplifies headspace measurements, and works perfectly. Customers also mention that the set of headspace gauges is great, functional, and covers many calibers.

"This set of headspace gauges are great. They're cheap, they work and they're light...." Read more

"Easy to use. Provides more precise measurement for setting dies for shoulder bump when resizing." Read more

"Product allows user to measure relative headspace from a neck datum to case head on almost all cases." Read more

"Simplifies headspace measurements. Recommended" Read more

10 customers mention10 positive0 negative

Customers appreciate the value of the reloading tool. They say it's an inexpensive, easy tool that works well.

"Great price." Read more

"This set of headspace gauges are great. They're cheap, they work and they're light...." Read more

"...unfired case and the Hornady headspace gage fills that need at a reasonable price, plus it comes with the most popular inserts (for checking datum)..." Read more

"Great price seem to work pretty good too. Must have for long range shooting" Read more

9 customers mention9 positive0 negative

Customers like the accuracy of the product. They say it's a great tool for precision reloading, and range time showed huge gains in accuracy after separating fire formed from full case resized brass. Customers also say it is a must for handloading with any precision, and a necessary tool to fine-tune re-loads.

"I like this tool. Easy to use and very accurate. I use it in conjunction with Hornady's caliper anvil...." Read more

"...This set will pay for itself in brass life and also help with accuracy. I should have bought it years ago...." Read more

"...Range time showed huge gains in accuracy after separating fire formed from full case resized brass!" Read more

"It is a necessary tool to fine-tune our reloads, if you are into precision shooting." Read more

Must have for Reloaders !!!!!
5 Stars
Must have for Reloaders !!!!!
Reloading the 30-30 for my Marlin 336 I was getting really dismal accuracy results with every component combination I tried and telltale signs of excess case expansion. What this headspace Gauge has revealed is that these cases are stretching a whopping .029" after firing. I will obviously no longer full length size my cases for use in this rifle as this will surely result in a case separation after not too many reloads. I am hoping this helps with my accuracy issue also.
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