Is it the interlock bullet?
If so, I think the expansion envelop bottoms out around 1600fps... which is probably right around or a bit higher than the muzzle velocity you’re getting with 90gr loose 777.
You’ll definitely get plenty of penetration, but I’d be a bit doubtful on reliable expansion.
I haven’t tried that bullet, but have found the 300gr XTPs (non-Mag) in both 44 & 45cal expand well when pushed by 100gr 777 in my Optima V2, out to 175 yards. Haven’t tried any farther.
I’m partial to the 44 bullet, though... shoots flatter and a tad tighter in my barrel.
Both put meat on the table..
If it’s not the Interlock bullet, it should expand well enough. It might benefit from a little more speed, but probably not enough to worry about on deer, as you’re going to get complete pass-through regardless.
Last edited by Wingatchtochwilsit; 04-02-2019 at 11:39 AM.
Reason: If not interlock....