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warbirdlover · December 15, 2011, 11:16 PM

He changed the cartridge case shoulder angles and basically designed a new round in which the case held more powder and yielded a higher velocity then the original (improved). RCBS has some "improved" rounds also. A good example is the .257 Roberts which has the two "improvements" (RCBS and Ackley). If you go to these you'll have to make your own cases (fire forming), buy the special reloading dies and handload.

December 15, 2011, 11:16 PM	#2
warbirdlover Senior Member Join Date: December 13, 2009 Location: central Wisconsin Posts: 2,324	He changed the cartridge case shoulder angles and basically designed a new round in which the case held more powder and yielded a higher velocity then the original (improved). RCBS has some "improved" rounds also. A good example is the .257 Roberts which has the two "improvements" (RCBS and Ackley). If you go to these you'll have to make your own cases (fire forming), buy the special reloading dies and handload.