I think sierra's tipped game king is a pretty good choice.
You'd have to plug the numbers for yourself, but when I ran them them in a ballistic calculator, they were still doing 1400 fps at about 415 yards with 16" barrel velocities.
When I talked to the folks at Sierra they said they should still open up at velocities as low as 1400.
I'm sure with a longer spout you'd be well into the high 5 yardages.

Last edited by CaptArab; 07/22/20.