Originally Posted by 7stw
Jstruck, I'm pretty sure it is a 1-14 twist as was mentioned. Winchester makes a 45 grain HP that is advertised to be at 4000 fps. I have not chronoed them, but they are surprisingly accurate in my gun which is similar to yours, except mine is a BDL configuration.
I shot a chipmunk at OVER 200 yards, and all I saw was red mist. Wal Mart sells them. The brass is decent too. Again, a surprise! These are in a 40 round box.
I've bought the win 45 grain factories for my striker pistol in 22-250. They will hold moa for 5 shots and do 3500 fps out of a 14" barrel. No recoil either.