02-20-2014, 11:20 PM
I would not call the performance increase minimal, when you only shooting 2500 fps if you add 200 fps your adding quite a bit, 200 fps is less of a big deal when your shooting something at say 3500 fps. the 270 winchester is rated for 65k psi if I am not mistaken, these specs are normally tied to the rifles that will likely be shooting them rather than actual capabilities of the brass, for example the 3006 should function in garand rifles, the 6.5x55 operates at a lower pressure because of the swedish mausers. 30-30 has to function and not damage lever actions.
as to cratered primers gre tan rifles deals with this by bushing the firing pin on bolt action rifles. if the firing pin hole is sloppy thats where your cratering problem comes into play. I am not saying you can load to 65k without issues, perhaps those that set the spec on the grendel felt that it would be too easily to spike well beyond that. but it seems like the pressures that the grendel is rated for is leaving some speed on the table. as a handloader I want all the speed I can safely get. if the problem is a weak bolt and a loose firing pin hole that sounds easy enough to correct.
as to cratered primers gre tan rifles deals with this by bushing the firing pin on bolt action rifles. if the firing pin hole is sloppy thats where your cratering problem comes into play. I am not saying you can load to 65k without issues, perhaps those that set the spec on the grendel felt that it would be too easily to spike well beyond that. but it seems like the pressures that the grendel is rated for is leaving some speed on the table. as a handloader I want all the speed I can safely get. if the problem is a weak bolt and a loose firing pin hole that sounds easy enough to correct.