Have you found any difference/effects using faster or slower burning powder?
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The 5.56 is a small capacity case. There's not a whole lot of variance in the burn rates of suitable powders
The Knights Ammament SR-15E3? You've never heard of it? :confused:
It has a reputation for being one of the softest shooting guns around, and does so with a carbine buffer.
Ha! It uses a .308 SR25 gas tube IIRC. This places the gas port about 11.2" (about) from the face of the receiver on a 16" barrel. So longer than mid-length.
i just did basic function testing.. i used tac only, so burn rate was the same throughout. basically i just loaded one round in a mag 20 times and made sure the bolt locked back. definitive function testing would probably require a high speed camera.
one thing i did try several years ago in regard to fast powder was h4198 (i think) which is a very fast burning powder. my cmmg middy (old gun i don't have anymore) functioned fine on it, but the bolt speed was noticeably slower. I'd definitely stick to TAC or h335 or other powders in that range of burn speed when reloading for the ar15.