My 375 whelen(375-06) has to have the brass trimmed to 2.400 so I understand about that trimming stuff. I have recently started experimenting with reloder 15. 59,grains gives me just at 2600 even with the nosler 260,accubond. I have an extremely short throat though so that might point towards my higher velocities at the same powder charges and a heavier bullet. I look forward to more of your results.
