Im not an expert but just realistic. Its hard to beat the Ruger Hawkeye 416 ruger or get an No1 in 416 rem or 416 ruger. This is the easiest route.
Ive got a new unfired No1 416 Rem i picked up 20 yrs ago at a hardware store that was closing out the big bores that didnt sell. So i picked some up. Ive also got an 375 Ruger Hawkeye. This is what i own so it would jave to make do.
