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Rifle · Wildcat

.45 Raptor

11.5x46mm

A big-bore cartridge for the AR-10/AR-308 platform, created by Arne Brennan in 2014 by necking up a .308 Winchester case to .452 caliber with .460 S&W Magnum-derived geometry.

Identity
Introduced
2014
Type
Rifle
Origin
United States
Inventor
Arne Brennan
Manufacturer
Loud Boom Ballistics
Standard
Wildcat
Status
Active
Availability
Limited
Dimensions
Bullet ⌀
0.452″
Case length
1.8″
Overall length
2.26″
Base ⌀
0.473″
Twist
1:18
Primer
Large Rifle
Case type
Rimless
Performance
Max pressure
40,000 psi
Eff. range
300 yd
Max range
1500 yd
Recoil
18–28 ft·lb

Ballistics

Representative trajectory · 100 yd zero0–800 yd
100 yd · zero0″−108″108″ drop @ 800 yd0400800Open in Ballistic Compare ↗
Velocity
2,200–3,000 fps
Energy
2,900–3,600 ft·lb
Parent case
.308 Winchester

Representative trajectory — modeled from a single velocity input, not a measured load.

Dimensions

.45 Raptor cartridge dimensions diagram

Reloading cost

Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.

Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.

Lineage

Immediate parent
.308 Winchester
Size vs parent — to scale.45 Raptor · 2.26″ OAL.308 Winchester · 2.8″ OAL

Drawn to one scale from published dimensions. Bottleneck shape is approximate (shoulder geometry not recorded).

Family TreeOpen .45 Raptor in the interactive cartridge family tree↗

Connected reference

FirearmsFirearms in .45 Raptor↗ToolCompare ballistics↗

History

Brennan — whose earlier 6.5 PPC work fed into the 6.5 Grendel — designed the .45 Raptor to give AR-10 shooters a big-bore that feeds from modified .308 magazines and uses common .451/.452 pistol bullets. It caught on with hunters wanting semi-auto stopping power and shooters in straight-wall-friendly regions.

FAQs

What twist rate does .45 Raptor use?
.45 Raptor typically uses a 1:18 twist rate.
What bullet diameter is .45 Raptor?
.45 Raptor uses a 0.452″ (11.481 mm) diameter bullet.
Is .45 Raptor still in production?
.45 Raptor is active; typical availability is limited.
What is .45 Raptor used for?
.45 Raptor is primarily used for hunting.
What is .45 Raptor based on?
.45 Raptor is derived from the .308 Winchester case.

Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. Spotted an error? Report it →