Welcome,
I have a 6x45 in a Cooper model 51,and have done quite a bit of load development, easy wildcat to load for, and I am able to get a 80gr Serria boat tail, up to 3000 fps, in a 20" tube. 65 gr to 3180 fps.
Proberley my second most accurate rifle, espically accurate with flat base bullets, 75 gr, Serria, being the best, Sako 6ppc is better, but not by much.
The other forum, has a thread running, with lots of load data, in reloading section. Hodgdon also has load data.
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