My 257 Robert model 7600 is very accurate. Just as accurate
as the model 70 257 Roberts. I have 3 magazine for it.
the original one, a 6mm,and a 243 mag. All work but the 257R
on slides in a little better. The 6mm one allows a longer OAL
as it has no filler in it. But I make all my loads 2.825 any
way. I,m not crazy about that loose feel of the pump.