Re: H380 primer questions
Personally Reloder 10x or Imr 4064 work best in 22-250, RE10x will get you over 4200fps with 35 grains, no pressure and superb accuracy. .If you in sistence on Hogdons try H335 or Benchmark.
Try H4831 in your 260.
Tty Imr4831 in your 300wsm.
H380 burns cleaner and gets a full burn with magnum primers, the only thing
i still use that powder for is my 250 Savage lever gun, and I use mag primers.