That’s the max load for 223 Remington chamber. I’m running a Wylde chamber and can run to 5.56 pressures. the hornady manual they have 5.56 data for AR comp, that’s where i got my start point. the Sierra has a lot less bearing surface than the 75gr eld-m as well so using hornady data shouldn’t be an issue.. For those that are using 223 remimgtons I would definitely back off my load or get your chamber cut to a 223 Wylde chamber.

Last edited by 79S; 04/29/20.

Originally Posted by Bricktop
Then STFU. The rest of your statement is superflous bullshit with no real bearing on this discussion other than to massage your own ego.

Suckin' on my titties like you wanted me.