Federal Large Magnum Primers ok for 10mm?

[Officeteck]

Hello - I am new to reloading, appreciate any help. I have some Federal large magnum pistol primers and longshot powder. (Magnums were only ones available to me at the time). Can I use those with longshot powder safely if I start with a light load? Also, I have cast some Lee 175 grain bullets, once shot brass. Appreciate the comments.

 

[gotboostvr]

Start low and work up slowly. I've used small rifle primers for 38spcl in the past when supplies were scarce.

 

[marchboom]

The use of magnum primers is usually due to using certain hard to light powders or the case uses a LOT of powder. Just start out low and watch for high pressure signs. You'll probably use less powder and won't reach a "book max".

 

[Herman B]

I've used mag primers with Longshot for 10mm,180 gr and get good results, no ill effects. Do the usual thing we all do...start low, work-up slowly and observe.

 

[Officeteck]

Thanks a lot, very helpful. I see on the longshot page they also have data for 500 magnum which I also shoot. Working my way up to that cast and load. Again, thanks a lot!

 

[gotboostvr]

Thanks a lot, very helpful. I see on the longshot page they also have data for 500 magnum which I also shoot. Working my way up to that cast and load. Again, thanks a lot!

If I recall I used large rifle primers in 500mag (with unique of all things)