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Forum: 300 Whisper Rifles and Pistols

10-09-2010, 05:11 PM

Replies: 13

Short Stroking in Subsonic AR15

Views: 3,402

Posted By RobRat

Tried the H4198 under the 200SMK's - and it...

Tried the H4198 under the 200SMK's - and it cycled wonderfully! The slower powder is doing the trick, If I can only get some AA1680!!!

The range was crowded, and I was only able to set the chrono...

Forum: 300 Whisper Rifles and Pistols

10-03-2010, 10:17 PM

Replies: 13

Short Stroking in Subsonic AR15

Views: 3,402

Posted By RobRat

Checked my TP555 gas block, mine is (going...

Checked my TP555 gas block, mine is (going clockwise) closed, then partially open, then fully open. Talked to the 'smith that installed it, he didn't remember the size of the port, but he says he...

Forum: 300 Whisper Rifles and Pistols

08-26-2010, 11:42 PM

Replies: 13

Short Stroking in Subsonic AR15

Views: 3,402

Posted By RobRat

Update - its working better.... I switched...

Update - its working better....

I switched the lower to a A2 stocked lower w/rifle buffer, and got short stroking about every 3 rounds. I'm going to try to load up some rounds with AA1680 (if I...

Forum: 300 Whisper Rifles and Pistols

07-25-2010, 09:05 PM

Replies: 13

Short Stroking in Subsonic AR15

Views: 3,402

Posted By RobRat

Short Stroking in Subsonic AR15

I had a local gunsmith build an AR15 upper for me in 300/221, and a matching barrel on a Savage bolt action. Specs on the AR barrel - 16.5", 1:8 twist McGowan barrel, TP555 3 position gas block in...

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