The 1:14 twist is too slow to stabilize the 60 gr BT. The 60 gr PT is sometimes marginal. I have had great accuracy with the old style PT in my M700 VLS 22-250 which has a 1:14 twist.
The 53gr TSX in my 22-250 is one fine killing bullet and stable at short and long ranges. I think the 50-55gr and even 60grs are fine with 1 and 14 twist.
I've never attempted any 60 grainers out of my Rem 700 22-250. I've shot everything from 40 grainers on up and stopped on the 55's. I get excellent accuracy and results from both the 55gr B-tip and B-kings.