Primers. Can I do this?

[bullhead]

I am loading for a 308 and 270. Don't have many CCI200 large rifle primers left. Can I use the CCI 250 instead? Thanks.

 

[Bigjay73]

Yes, maybe trim a half a grain, and work back up. There is a chance it will increase pressure a very slight bit.

 

[Elevationwerks]

Different cup thickness on magnum primers. Same primer composition. I'd drop my powder back and work back up to be sure.

 

[JLS]

What both of these guys said. It might even give you better groups depending on the powder you’re using.

 

[bullhead]

Thanks guys!

 

[ImBillT]

No need to change powder charge. Every company is different in terms of what they label a magnum primer, but generally the difference is that the burn last longer. You really can’t fit more priming compound into a large rifle primer. They have little to no effect on pressure.

 

[DamascusSteel]

I am loading for a 308 and 270. Don't have many CCI200 large rifle primers left. Can I use the CCI 250 instead? Thanks.

Speer has reloading data with magnum primers for the 270 which is what I'm going by

 

[MThuntr]

Yep go for it but I'd start over with load development purely because you may find a better load when doing so.