I would use SLR primers. In my experiences, if the powder is designed for a loading certain things, i.e. Handgun loads, magnum loads, ect, listen to the powder, because I can almost guarantee they tried it with magnum primers as well. Typically, Magnum calibers do require the Magnum primers for the extra oomph. My guess is that H1000 very hot and would/could over pressure with Magnum Primers.
Disclaimer, I have never used H1000 but I know that it is a fairly slow burning powder, that is designed for the magnum loads and calibers. But I stick to what the powder says for primers in event of conflicts.
GL
i usto do the same thing but durring load development on a 7mm rem mag i was getting somthing like a hang fire on a old muzzleloader on my lower powder charges. once i got to the higher charges it acted fine or if i was shooting up hill on the lower charges it would work fine aswell. basically i didn't have a high enough fill rate to ignite the power unless it was sitting against the primer.
switched to mag primers and dever had trouble again
Use a 50 cal primer. I dont reload but I would say mag.Ok, I am reloading for the 300 Win Mag and the reloading manual I am using (Hodgdon online) says to use a magnum primer, but the powder I am using states to use a standard large rifle primer (I am using Hodgdon H1000). any experience or suggestions would be great.
We all hope it was 22.