I'm not new to reloading but over the years I've only loaded a few thousand standard 55gr FMJ's for AR's and some .308 for both a Remington 700P and a couple AR10's....not a ton of experience but I have the basics down.
I just got into SBR's within the last year and now have 10.5, 11.5, and 12.5 AR barrels to try to work up some loads for. I just bought a couple thousand mixed lot 69-77gr Sierra Matchking bullets along with a couple thousand unbranded 62gr bonded soft points from RMR and I'm looking for opinions on powders that will push these bullets relatively fast.
With Black Hills factory 77gr Matchking (5.56), I'm getting 2414 fps in 10.5" and 2503 fps in a 12.5" barrel.
With Fusion MSR factory 62gr I'm getting 2515 fps in 10.5" and 2657 fps in 12.5" barrels.
Anyone have opinions on some good powders to try to approach these velocities in short barrels? I currently have H335, TAC, Varget, and H4895 on hand. I'm planning on buying a couple more powders to try and was thinking CFE223 and 8208XBR. Other suggestions?
I did a couple searches and didn't find much info!