There is precious little data out there for 375 whelen improved, so I’ve always struggled with loads for mine. I just put together a 9.3 x 62 on an M1917 action. There is tons of data for the 9.3x62 so I got to thinking, the cases look like they’d have similar capacities.



After I get some 9.3 brass fireformed, I’m going to take about 10 cases from both calibers and test them for volume. If they are close, using 9.3 starting data may be a good starting place for different loads in the 375 Whelen. Ive got my fingers crossed.


JTD