oneshot,
I think a 1/48 twist is certainly capable of handling both
the PRB and the conical. It will be up to you to work with both and
see which works with the barrel.What works for my barrel may not
work in yours.That is one of the fun parts...trial and error.
I don't take game shots over 75yds.Longest I've made is 60 yds,
most well under that.My rifles are a lot more accurate than my eyes
at my age. Good luck with your hunts!!
snake-eyes