*NEW*
I will soon be offering a line of wildcat chamberings based off of the WSSM line! I have dies, reamers and barrel-blanks on order for: 7mm WSSM, .300 WSSM, .338 WSSM and .358 WSSM. The .358 version will be trimmed enough to qualify for being Indiana big-game legal!
UPDATE!
I have just received the dies from Hornady! I chambered a Shilen blank in .358 and fire-formed some cases. I have shot some 200 grain Sierra bullets, seated to the cannelure, and am getting velocities that are exceeding the .358 Winchesters max. loads. Even by exceeding the .358 Winchester by over 100 FPS, I am still getting on signs of high pressure. I will keep you posted as to how this project progresses.
AR-15 uppers in the Winchester Super Short Magnum line.
WSSM bolt and cartridge on left and .223 bolt and cartridge on right.
Left to Right: .223 Rem. .243 Win. .243 WSSM .300 WSM
WSSM upper conversion
The basic custom upper conversion is a stainless ultra match (SUM) barrel with a free-floated aluminum hand-guard. Picatinny gas-block, flat-top upper receiver with forward assist. Upper comes complete with bolt/carrier, charging handle and magazine. These uppers can be used with any, un-modified, mil-spec lower receiver. You can switch from .223 Rem. to .25 WSSM in 20 seconds! I am now using the Magpul anti-tilt followers as a standard feature in all of my WSSM magazines. By using these followers, I have increased the reliable capacity of the magazine and enhanced the reliability of the upper.
$749.00
Options:
- Custom fluting, add $95.00
- Integral compensator, add $119.00
- Ventilated hand-guard, add $50.00
- Extra magazine, add $35.00
- Sling stud/bi-pod stud on handguard, add $15.00
- Norrell's moly-resin on exposed barrel $50.00 (complete barrel, for vented HG. $65.00)
- Shilen stainless hand-lapped select-match barrel $150.00
- Camo! call for details
Weight:
- 22", .25 WSSM, fluted upper, complete: 5.8 lbs
- 24", .25 WSSM, fluted upper, complete: 5.95 lbs
- 22", .25 WSSM, un-fluted upper, complete: 6.23 lbs
- 24", .25 WSSM, un-fluted upper, complete: 6.5 lbs
Note: The .243 WSSM uppers in the same configuration will weigh .15 to .2 lbs more than the .25
Note:
Where all of the Winchester factory loaded ammunition for the .223 and .243 WSSM fit perfectly in the modified AR-15 magazine, some of the .25 WSSM factory loads are slightly longer than will fit the magazine. On the 120 grain power point, I have set the bullet back about .015" and have gotten great accuracy, perfect feed and function without any measurable pressure increase. If you are going to hand-load for the .25 WSSM, the mag-length is not an issue.
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My WSSM magazines hold 7 WSSM rounds.
22", fluted, .25 WSSM
