Nice. I will start loading 77SMK for my 18" Noveske barrel this weekend finally.
Did you load mag length or single feed?
Mag length. Just short enough not to catch on the inner wall.
It's at least a 1:8 twist right?
Yep 1:7. Hope they shoot well, picked up 1,000 of em at Cabelas on sale with coupon.
It's worth noting that Alliant's website has 22.1 as the max for AR Comp. I found a lot of people reporting this was more of an accuracy spec than max. I, along with a lot others didn't find any pressure signs (at least until 23.5 grains) with the loads we tested. I inspected each casing after firing and they all looked normal.
The Hornady 75 BTHP bullets are worth a look since they're almost half the price, but I haven't got them to be as accurate in a couple AR's. I've tested multiple powders and charges with them.