i’ve got a 1 in 7 twist, i’ve shot everything from 55-75 through it.
it seems to be a little more accurate with 75, but it’s fine with 55 too.
any significant barrel life difference? the 55’s are obviously going much faster.
I would guess throat erosion would be exacerbated by lightweight, hotrodded loads more than anything else. Again, just a complete SWAG on my part.