The UK's Finest Independent Forum for Shooters and Gun Owners. Est 2010.

Morning,

Ive done a fair bit of research but keep getting conflicting info.

How much difference does a change of primer brand/type make.

Ive got a load im happy with on my 6.5CM with cci std large primers but they will run out and the options are change brand or rework with small primer brass. Am i looking at a complete new work up or is there a safe way to use the current load as a start point?

Ive got large and small, standard and magnum options.

Cheers
Nat

It can make a difference with both accuracy and/or pressure.
The normal guidance given in most reloading manuals (consult yours to confirm this) is that you should reduce your charges by 10% when making any changes to components and to work back up in small increments.

Chapuis wrote: ↑Wed Dec 21, 2022 9:07 am It can make a difference with both accuracy and/or pressure.
The normal guidance given in most reloading manuals (consult yours to confirm this) is that you should reduce your charges by 10% when making any changes to components and to work back up in small increments.

Much appreciated, it was where i was heading so good to get some confirmation. Its' not like i have anything else to do over Christmas!

Cheers
B-)

Interestingly, the reloading article this month in Rifle Shooter is about primers and it states changing the primer has the least effect on the load compared to changing powder, brass etc.

I use Sellior and Bellot, Federal, PPU and CCI and have not noticed any difference.