Jimm
Well-Known Member
What should I look for when checking case expansion forwarsd of the ext. groove/belt .
For example my new brass miked .510 before firing.
Then on a ladder test that started with middle powder weights and progressed to listed max loads for that combo I miked the cases and got measurements onthe low end of .513 that went about half way through the test(.3 gr. increments),then gradually increase to .514 on the last (max listed ) load. There was no bolt lift change or primer flattening or cratering etc for visuals .
This is readings after the first firing .
Jim
For example my new brass miked .510 before firing.
Then on a ladder test that started with middle powder weights and progressed to listed max loads for that combo I miked the cases and got measurements onthe low end of .513 that went about half way through the test(.3 gr. increments),then gradually increase to .514 on the last (max listed ) load. There was no bolt lift change or primer flattening or cratering etc for visuals .
This is readings after the first firing .
Jim