Primers

[wolf13]

Has any body used Winchester small rifle primers in the Grendel I am just getting started loading for it and have a lot of these primers from loading my 223 and 204 and was hoping they will work.

[Klem]

They will work.

Fair to say that all small rifle primers will work but the harder cups lessen the chance of slam fires. Everyone has their preference but if you have beaucoup WSR spare then knock yourself out.

[LRRPF52]

Volume II of the 6.5 Grendel Reloading Handbook series has the recommended primers for AR15/6.5 Grendel on page 67.

CCI 450
CCI BR4
CCI 41
Wolf SRM
Rem 7 1/2 Bench Rest
Federal 205/205M

The Winchester SRP's have a thin cup, so they are generally avoided in self-loading firearms with a floating firing pin. Same reason why we avoid the Federal 200 and Remington 6 1/2.

[wolf13]

That's what I was looking for thanks

[Old Soldat]

I've used CCI#400 primers for years in all 3 of my AR15s and have not had any problem with them-over 4,000 rounds fired to date. I also plan on using them and IMR8208 for my Grendel reloads.

[LRRPF52]

NRA Hi Power competitors have seen quiet a few slam fires with the softer primer loads, mainly with the muzzle down, hot weather, with bolt dropped on a chambered cartridge.

I think the CCI400's are fine in colder weather, but I personally don't want to set up primer selection based on weather. I have a case of them that I bought during the panic because you couldn't get anything else.

Just beware that there are known instances where the thinner cup primers have been the culprit for slam-fires in certain conditions, with certain loading procedures.