Lindcott Armory Rifle · Wildcat
.338 Razorback
Ultra-efficient subsonic AR-15 wildcat: a 10mm Auto pistol case reformed to .338, driving a ~300gr bullet at ~1,000 fps..
- Caliber
- 0.338″ · 8.585 mm
- Case
- Rimless
- Parent
- 10mm Auto
- Primary use
- Hunting, Big Game
- Status
- Limited
- Type
- Rifle
- Origin
- United States
- Inventor
- Unknown / wildcat
- Standard
- Wildcat
- Status
- Limited
- Availability
- Handload Only
- Primer
- Large Rifle
- Case type
- Rimless
- Max pressure
- 60,000 psi
- Eff. range
- 150 yd
- Max range
- 900 yd
Ballistics
- Parent case
- 10mm Auto
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
SAAMI · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 8.59 | 0.338 | ~ |
| Neck ⌀ | — | — | |
| Shoulder ⌀ | — | — | |
| Shoulder angle | — | — | |
| Base ⌀ | 10.79 | 0.425 | ~ |
| Rim ⌀ | 10.79 | 0.425 | ~ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.40 | 0.055 | ~ |
| Neck length | — | — | |
| Case length | 25.20 | 0.992 | ~ |
| Overall length | 55.88 | 2.200 | ~ |
Missing a dimension for .338 Razorback? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.
Reloading costestimate cost per round vs factory
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
Connected reference
History
Introduced in the early 2020s by Underwood Ammo (credited to Jeff Mager); a reformed 10mm Auto case for suppressed subsonic AR-15 use. (DB year 2005 was incorrect.)
FAQs
- What bullet diameter is .338 Razorback?
- .338 Razorback uses a 0.338″ (8.585 mm) diameter bullet.
- Is .338 Razorback still in production?
- .338 Razorback is limited; typical availability is handload only.
- What is .338 Razorback used for?
- .338 Razorback is primarily used for hunting, big game.
- What is .338 Razorback based on?
- .338 Razorback is derived from the 10mm Auto case.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →