Budman,
Gosh I am no loading source but I suppose I'd try 60gr to start and work up.
I began with 58 with the 105 gr Berger hybrid, ended up with 64 as top load without signs of pressure. Actually going out to shoot this load repeatedly this morning to see if it continues to be accurate.
Ditto for the 257 Roy load.
Be sure to let us know your results.
Gosh I am no loading source but I suppose I'd try 60gr to start and work up.
I began with 58 with the 105 gr Berger hybrid, ended up with 64 as top load without signs of pressure. Actually going out to shoot this load repeatedly this morning to see if it continues to be accurate.
Ditto for the 257 Roy load.
Be sure to let us know your results.