AltitudeCraft vs Hornady Bullet Comparator Kit: Honest Comparison (2026)

If you reload ammunition for precision shooting, you already know that consistent cartridge base-to-ogive length (CBTO) is non-negotiable. The tool that makes consistent CBTO measurement possible is a bullet comparator — and the two kits reloaders argue about most are the AltitudeCraft Bullet Comparator Kit with 14 Inserts and the Hornady Lock-N-Load Bullet Comparator Set. This side-by-side comparison gives you the unvarnished truth about both so you can pick the right kit for your bench.

Why CBTO Measurement Matters More Than Overall Length

Most reloading manuals tell you to measure cartridge overall length (COAL). That is a fine starting point, but COAL measures to the bullet tip — the least consistent part of a jacketed bullet. Tip geometry varies from lot to lot and even bullet to bullet by as much as 0.010–0.015 inches. CBTO, by contrast, measures from the case head to the ogive — the curved section that actually contacts the rifling. A comparator insert makes this measurement repeatable to within 0.001 inches when proper technique is followed.

According to the Hornady reloading resources, CBTO is the gold standard for seating depth consistency. We agree — and that is exactly why the insert count and caliber coverage of your comparator kit are so important. If you are new to comparator measurements, our complete guide to using a bullet comparator for precision reloading walks through the entire process step by step.

Product Overview: What You Get in Each Kit

AltitudeCraft Bullet Comparator Kit (14 Inserts)

The AltitudeCraft Bullet Comparator Kit includes a comparator body that clamps onto any standard caliper jaw, plus 14 individual inserts covering calibers .17, .20, .22, .24 (6mm), .25, .27 (6.8mm), .28 (7mm), .30, .308, .32, .338, .35, .375, and .45. The inserts are CNC-machined from hardened steel, laser-engraved with caliber markings, and stored in a labeled organizer case.

Hornady Lock-N-Load Bullet Comparator Set

Hornady's set ships with 7 inserts (.22, .24, .25, .27, .28, .30, .33) plus the Lock-N-Load comparator body. Additional inserts can be purchased individually. The body uses Hornady's bayonet-style Lock-N-Load attachment system.

Head-to-Head Comparison Table

Where AltitudeCraft Wins

1. Caliber Coverage Out of the Box

This is the biggest differentiator. With 14 inserts, the AltitudeCraft kit covers rimfire (.17), varmint calibers (.20, .22), long-range favorites (.24/6mm, .28/7mm, .30, .338), and even pistol calibers (.32, .35, .375, .45). If you reload for a .17 Hornet, a 6.5 Creedmoor, and a .45-70 Government, you open one case and every insert is there. With the Hornady kit, you would need to separately purchase inserts for .17, .20, .308, .32, .35, .375, and .45 — that is seven additional purchases.

2. Value per Dollar

Individual comparator inserts typically retail for $8–$15 each. If you need to bring a 7-insert Hornady kit up to the same 14-caliber coverage, you are looking at $56–$105 in additional inserts on top of the base kit price. The AltitudeCraft kit delivers all 14 inserts in one purchase at a significantly lower total investment.

3. Convenience for Multi-Caliber Reloaders

Many serious reloaders work with 5–10 different cartridges. Switching between rifle and pistol calibers is seamless when every insert lives in a single organized case. No hunting through loose inserts in a drawer or realizing mid-session that you never ordered the .35-caliber insert.

Where Hornady Wins

1. Brand Recognition and Ecosystem

Hornady has been making reloading tools since 1949. Their Lock-N-Load system is an industry standard, and many reloaders already own Hornady presses, dies, and accessories. If your entire bench is Hornady, the comparator fits naturally into your workflow. There is also a massive knowledge base of YouTube videos and forum posts specific to the Hornady comparator.

2. Established Dealer Network

You can walk into nearly any gun shop or sporting goods store and find Hornady products on the shelf. Replacement inserts are widely stocked. AltitudeCraft, as a newer brand, relies primarily on online retail — which is perfectly fine for planned purchases but less convenient if you need an insert today.

3. Lock-N-Load Attachment System

Hornady's bayonet-style Lock-N-Load mechanism allows fast insert changes with a quarter-turn. It is a well-engineered system that many reloaders appreciate. The AltitudeCraft body uses a universal friction-fit design that works equally well but uses a different approach to swapping inserts.

Pros and Cons Summary

AltitudeCraft Bullet Comparator Kit

Pros:

• 14 inserts cover .17 to .45 — nothing extra to buy
• Lower cost per insert compared to building up a Hornady kit to equivalent coverage
• CNC hardened steel construction with laser-engraved markings
• Organized storage case keeps every insert labeled and accessible
• Universal caliper fit works with Mitutoyo, Starrett, iGaging, and others

Cons:

• Newer brand with less name recognition in the reloading community
• Fewer local retail locations (primarily online)
• Smaller community knowledge base compared to Hornady

Hornady Lock-N-Load Bullet Comparator

Pros:

• Trusted brand with 75+ years in the reloading industry
• Lock-N-Load bayonet attachment for quick insert changes
• Widely available at local dealers and online retailers
• Extensive community support and tutorial content

Cons:

• Only 7 inserts included — missing .17, .20, .308, .32, .35, .375, .45
• Expanding coverage requires buying individual inserts at $8–$15 each
• Total cost to match AltitudeCraft's 14-caliber coverage can exceed $100+ more

Real-World Scenarios: Which Kit Fits You?

Scenario 1: The Multi-Caliber Benchrest Shooter

You reload for 6mm BR, .308 Winchester, .300 Win Mag, and .338 Lapua. You want sub-0.3 MOA groups and measure every round. Pick AltitudeCraft. All four caliber inserts are in the kit, and you will appreciate having the .17 and .20 inserts available if you pick up a varmint rifle later.

Scenario 2: The Dedicated .223/6.5 Creedmoor Shooter

You reload only two calibers and already own Hornady dies and a Hornady press. Hornady works fine. Both .22 and .264 inserts are included in the 7-insert set, and you benefit from the Lock-N-Load ecosystem integration.

Scenario 3: The Reloader Who Does Everything

You load rifle cartridges for hunting season, .45 ACP for weekly IDPA matches, and .17 HMR for pest control. AltitudeCraft is the clear winner. Hornady's base kit would leave you without .17, .32, .35, .375, and .45 inserts — that is five extra purchases just to match what AltitudeCraft includes.

Measurement Accuracy: Both Deliver

In practice, both kits produce repeatable CBTO measurements to within 0.001 inches when used with a quality caliper. The comparator insert is a simple go/no-go bore — the ogive of the bullet contacts the insert at a specific diameter, and the caliper measures the distance from the case head to that contact point. There is no mechanical advantage to one brand's insert over the other at this level. Where the difference shows up is in caliber coverage and total cost of ownership, not in measurement precision.

If you want to verify your comparator's accuracy, read our step-by-step comparator calibration guide for techniques that ensure rock-solid readings every session.

What Reloading Forums Are Saying

Discussions on r/reloading on Reddit frequently highlight the insert-count frustration with the Hornady kit. A common thread is reloaders who buy the Hornady set, then discover they need to order 2–3 more inserts for calibers they assumed were included. The AltitudeCraft kit sidesteps this entirely with its 14-insert approach.

That said, many experienced reloaders who already own the Hornady set have invested in extra inserts over the years and are perfectly satisfied. The Lock-N-Load ecosystem loyalty is real and well-earned.

Our Verdict

If you are buying your first bullet comparator kit or reloading for 3+ calibers, the AltitudeCraft Bullet Comparator Kit delivers substantially more value. You get double the inserts, broader caliber coverage from rimfire to large-bore pistol, and a lower total investment. The honest trade-off is that Hornady has deeper brand trust and a more established dealer network — advantages that matter if you prefer buying locally or want to stay within a single-brand ecosystem.

For pure functionality and value, AltitudeCraft wins this comparison. For brand loyalty and retail convenience, Hornady holds its ground. Both tools will give you the sub-0.001-inch CBTO repeatability that precision reloading demands.

Shop AltitudeCraft Bullet Comparator Kit →

Frequently Asked Questions

Can I use AltitudeCraft inserts with a Hornady comparator body?

No. Each brand's inserts are designed for their own comparator body. The bore diameters are caliber-matched, but the external fit dimensions differ between brands. You need to use AltitudeCraft inserts with the AltitudeCraft body and Hornady inserts with the Hornady body.

Does the AltitudeCraft comparator fit Mitutoyo calipers?

Yes. The AltitudeCraft comparator body is designed for universal fit and works with all standard-jaw calipers including Mitutoyo, Starrett, iGaging, and most import brands. The jaw clamp accommodates jaw thicknesses from 0.040 to 0.200 inches.

Is the Hornady Lock-N-Load comparator compatible with digital calipers?

Yes. Both the Hornady and AltitudeCraft comparator bodies attach to digital and dial calipers. There is no functional difference in caliper compatibility between the two brands.

How many extra inserts do I need to buy with the Hornady kit to match the AltitudeCraft kit?

Seven additional inserts: .17, .20, .308, .32, .35, .375, and .45. At typical retail pricing of $8–$15 per insert, that adds $56–$105 to the cost of the Hornady kit.

Which kit is better for long-range precision rifle reloading?

Both kits work equally well for precision rifle reloading. The inserts produce identical CBTO measurement accuracy. The AltitudeCraft kit includes more calibers out of the box — particularly useful if you shoot .338 Lapua or .375 CheyTac — while the Hornady kit covers the most popular long-range calibers (.22, .24, .25, .27, .28, .30, .33) in its base set. For a deeper dive into comparator technique for precision rifle, see our 2026 buyer's guide to bullet comparator kits.

Do I need a bullet comparator if I already use a headspace gauge?

Yes. A headspace gauge and a bullet comparator measure different things. The headspace gauge checks the case dimension from the shoulder datum to the case head — critical for proper chambering. The bullet comparator measures from the case head to the bullet ogive — critical for consistent seating depth and accuracy. Serious reloaders use both tools together. Learn more about how these tools complement each other in our precision reloading guide.

Related Resources

• How to Use a Bullet Comparator for Precision Reloading — Complete tutorial with step-by-step photos
• Best Bullet Comparator Kits 2026: Buyer's Guide — Full market comparison including budget options
• Browse All AltitudeCraft Precision Tools — Our complete catalog of reloading and gunsmithing tools

Disclosure: AltitudeCraft manufactures the bullet comparator kit reviewed in this article. We have made every effort to provide an honest, balanced comparison. All Hornady specifications are sourced from publicly available product listings. Prices and availability are subject to change.

Last updated: April 2026