Thread: Federal large primers

Using GM215M primers for target work in 308.
ADI's Max load for WIN brass is 45gns AR2208, for 168gn bullets - Sierra TMK on trial.
Backed off to 43.5gns in Lapua brass, under same bullet - slight primer cup raised around pin strike (all went 'bang' fine), but corners were still round, and shape not flattened, no ejector mark on cartridge head.
Soft primers and a fussy chamber (case length), gave me this result.
So have trimmed cases to 50.8 mm - 2.0003", and will try again with the same powder weight/case.
Thanks to those who highlighted Fed primers as being softer than CCI.
Have used CCI with near max loads of 2208, in Lapua brass under 155gn HBC, and no issues with primer deformation.
Same with Fiocchi primers.