Achieve unparalleled accuracy and consistency in your reloading process with the Modular Headspace Comparator Kit. This meticulously engineered kit is designed for reloaders who demand the highest levels of precision in their ammunition. Whether you’re measuring headspace or bullet seating depth, this comparator kit delivers repeatable and reliable results, round after round.
Key Features of the Modular Headspace Comparator Kit
This comprehensive kit is built to last and designed for ease of use, making it an essential tool for any serious reloader.
Durable Stainless Steel Construction
Each component of our headspace comparator kit, including both the comparator bodies and bullet inserts, is expertly machined from premium 17-4 stainless steel. This robust material choice ensures exceptional durability and resistance to wear, guaranteeing that your inserts will maintain their precision even after extensive use. Unlike kits made with less durable materials, our stainless steel construction provides a long-lasting solution for your reloading needs.
Enhanced Measurement Consistency
What truly sets our Modular Headspace Comparator Kits apart from the competition is their unwavering commitment to measurement consistency. The comparator bodies are precisely engineered with a slight tolerance or “play” built into the insert interface. This intentional design element allows all components to settle perfectly during measurement, eliminating inconsistencies and ensuring accurate readings for both headspace and bullet seating depth. This meticulous attention to detail translates directly into more consistent and predictable ammunition performance.
Caliber-Specific Bullet Inserts for Optimal Precision
Our bullet inserts are not generic; they are machined to the precise bore diameter of the specific caliber you are reloading for. For example, if you select a .243″ (6mm) caliber bullet insert, it will feature a .237″ bore hole. This exact sizing is crucial as it perfectly matches the lands of your barrel, providing a true and accurate measurement point on the bullet ogive. Furthermore, each bullet insert incorporates a 3° lead machined into its mouth. This angle is specifically designed to accommodate the ogive shape of commonly used bullets, ensuring proper alignment and preventing any deformation during measurement.
Headspace Comparator Compatibility Guide
To ensure you select the correct headspace comparator for your needs, please consult the following compatibility list. The Headspace Comparator Model is listed first, followed by the compatible cartridges.
204 Ruger
- 204 Ruger
223 Rem
- 223 Remington and 5.56mm NATO
- 222 Remington
- Wildcat Cartridges necked down from the 223 Remington
22 Cal x 28°
- 22-250 Remington
- Wildcat Cartridges necked down from the 22-250 Remington
22 Cal x 30°
- 22 Creedmoor
- 224 Valkyrie
- 22 ARC
22 Cal x 35°
- 22 GT (6GT necked down to 22 caliber)
- FN 5.7x28mm
22 Cal x 40°
- 22 Dasher (Non-Alpha Chamber)
- 22 BRA
- 22-250 Ackley Improved
- 223 Ackley Improved
22 Alpha Dasher
- .22 Cal Dasher with an Alpha Legacy Reamed Chamber
6mm x 20°
- 243 Winchester
- Wildcat Cartridges necked down from the 243 Winchester
6mm x 26°
- 6mm Remington
6mm x 30°
- 6mm Creedmoor
- 6 x 47 Lapua
- 6BR
- 6BRX
- 6mm Super LR
- 6 ARC
- 6 PRC
- 6 XC
- 6 PPC
6mm x 35°
- 6GT
- 6mm x 284 Winchester
6mm x 40° 273” Neck Diameter, .060” Neck Shoulder Radius
- 6mm Dasher
- 6BRA (6mm BR Ackley Improved)
- 243 Ackley Improved
- Any 6mm Cartridge with 40° Shoulder and a fired neck diameter smaller than .273”
6mm x 40° .275” Neck Diameter, .060” Neck Shoulder Radius
- 6mm Dasher
- 6BRA (6mm BR Ackley Improved)
- 243 Ackley Improved
- Any 6mm Cartridge with 40° Shoulder and a fired neck diameter smaller than .275”
6mm x 40° 279″ neck Diameter
- 6mm Ackley Improved cartridges with a fired neck diameter over .275″
6mm Alpha Dasher
- 6mm Dasher with an Alpha Legacy Reamed Chamber
25 Cal x 30°
- 25 Creedmoor
- 25 x 47 Lapua
- 25 PRC
- 25 SAUM
- 25 SST
25-06 Remington
- 25-06 Remington
6.5mm x 20°
- 260 Remington
6.5mm x 25°
- 264 Winchester Magnum
6.5mm x 30°
- 6.5 Creedmoor
- 6.5 x 47 Lapua
- 6.5 PRC
- 6.5 SAUM
- 6.5 Grendel
6.5mm x 35°
- 6.5 Winchester Short Magnum
- 6.5 x 284 Winchester
- 26 Nosler
6.5mm x 40°
- 260 Ackley Improved
- 6.5mm Wildcat cartridges with a 40 degree shoulder
6.5-06 Springfield
- 6.5-06 Springfield
6.5mm x 55mm Swedish
- 6.5mm x 55mm Swedish
270 Winchester
- 270 Winchester
27 Cal x 30°
- 277 Sig Fury
- 6.8x51mm
27 Cal x 35°
- 6.8 Western
- 270 WSM
280 Remington
- 280 Remington
7mm x 20°
- 7mm-08
7mm x 25°
- 7mm Remington Magnum
- 7mm STW
7mm x 30°
- 7mm SAUM
- 7mm Creedmoor
- 7mm LRM
- 7mm PRC
7mm x 35°
- 28 Nosler
- 284 Winchester
- 7mm WSM
- 7mm/300 WSM
- 284 Shehane
7mm x 40°
- 7mm-08 Ackley Improved
- 280 Ackley Improved
- 7mm Wildcat cartridges with a 40 degree shoulder
- 7 TCU
7mm Sherman Short
- 7mm Sherman Short, 40° Shoulder, .125” Neck/Shoulder Radius
.30 Cal x 20°
- 308 Winchester
- Wildcat Cartridges necked down from the 308 Winchester
.30 Cal x 30°
- 300 Remington Ultra Mag
- 300 SAUM
- 300 PRC
- 30 BR
.30 Cal x 35°
- 300 Winchester Short Magnum
.30 Cal x 40°
- 300 Norma Magnum Ackley Improved
- .30 Caliber Wildcat cartridges with a 40 degree shoulder
300 Blackout
- 300 AAC Blackout
30-06 Springfield
- 30-06 Springfield
300 Winchester Magnum
- 300 Winchester Magnum
300 Norma Magnum
- 300 Norma Magnum
300 Norma Magnum Improved 33°
- 300 Norma Magnum Improved 33°
338 Cal x 20°
- 338 Federal
338 Cal x 25°
- 338 Winchester Magnum
338 Cal x 35°
- 33 Nosler
338 Cal x 40°
- 338 Lapua Magnum Ackley Improved
- 338 Norma Ackley Improved
- 300 Norma Ackley Improved
338 Lapua Magnum
- 338 Lapua Magnum
- Wildcat Cartridges necked down from the 338 Lapua Magnum
338 Norma Magnum
- 338 Norma Magnum
- Wildcat Cartridges necked down from the 338 Norma Magnum
33XC
- 33XC
37XC
- 37XC
375 Cheytac
- 375 Cheytac
375 Enabler
- 375 Enabler
Datum Gauge Inserts for Reamer Print Measurements
For reloaders who require headspace measurements based on reamer prints, our kit offers a selection of Datum Gauge inserts. These precision-machined inserts allow for accurate headspace measurements when referencing reamer specifications.
Datum Gauge Compatibility List
Datum A .330″
- 17 Remington
- 204 Ruger
- 220 Swift
- 221 Remington Fireball
- 222 Remington
- 222 Remington Magnum
- 223 Remington
Datum B .350″
- 22 PPC
- 22-250 Remington
- 6mm PPC
- 6mm Bench Rest Remington
- 250-3000 Savage
- 6mm ARC
- 6.5 Grendel
- 6.8 SPC
- 7mm Bench Rest Remington
- 300 Blackout
Datum C .375″
- 6mm Remington
- 25-06 Remington
- 257 Roberts
- 6.5 X 55mm Swedish
- 6.5 Creedmoor
- 6.5mm X 47 Lapua
- 270 Winchester
- 7 X 57mm Mauser
- 7mm Winchester Short Magnum
- 280 Remington
- 30-40 Krag
- 30-30 Winchester
- 30-06 Springfield
- 300 H & H Magnum
- 7.62 X 39mm, M43
- 32 Special
Datum D .400″
- 223 Winchester Super Short Magnum
- 243 Winchester
- 243 Winchester Super Short Magnum
- 260 Remington
- 270 Winchester Short Magnum
- 7mm-08 Remington
- 300 Savage
- 303 British
- 308 Winchester
- 35 Remington
Datum E .420
- 257 Weatherby
- 6.5mm-284
- 264 Winchester Magnum
- 7mm Remington Magnum
- 7mm Remington Ultra Magnum
- 7mm Remington Short Action Ultra Magnum
- 7mm Shooting Times Westerner
- 8mm Remington Magnum
- 8×57 Mauser
- 8x68mm
- 284 Winchester
- 300 Winchester Short Magnum
- 300 Weatherby Magnum
- 300 Remington Short Action Ultra Magnum
- 300 Winchester Magnum
- 300 Remington Ultra Magnum
- 7.62x54R
- 325 Winchester Short Magnum
- 338 Winchester Magnum
- 338 Remington Ultra Magnum
- 35 Whelen
- 9.32x62mm
- 375 H & H Magnum
Invest in the Modular Headspace Comparator Kit and take your reloading precision to the next level. Ensure consistent headspace and bullet seating depth for improved accuracy and performance with every round you reload.
