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How much is too Much

hadjiihadjii Member Posts: 976 ✭✭
edited May 2008 in Perry Shooter Competition Shooting and Reloading Forum
I just tried some reloads for my 6.5 Rem Mag. The brass was brand new. I loaded 47.0 grains of IMR4320 behind a Berger 130 gr. VLD bullet, which was seated to a depth of 3.110". Yes, I had to load as a single shot, as I'm shooting a Remington 673. I measured the fired cases, and I am getting .005" stretch in length, going from 3.164" to 3.169", and .004" stretch above the belt, going from .506" to .510". Is that excessive stretch or not? Grouping was 1.25" on 3 rounds, and the 4th flew out to 1.75", or it may have been me too, because I was in kind of a hurry, and the gun was stone cold out of the cabinet. Thanks.
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    bpostbpost Member Posts: 32,664 ✭✭✭✭
    edited November -1
    The brass is now fit to your chamber. The growth seems fine to me. When you fire it for the second time the base strech should be about zero.
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    JustCJustC Member Posts: 16,056 ✭✭✭
    edited November -1
    new brass is undersized and will change during the first firing. Check the length growth on the 2nd firing and see if it doesn't go down. Now .004" growth in dia at the expansion ring is normal. I measured .004" growth on some win 338 win brass today after fireforming. It also pushed the shoulder fwd more than .020" to match the chamber according to the headspace tool.
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    MIKE WISKEYMIKE WISKEY Member, Moderator Posts: 9,972 ******
    edited November -1
    when reloading this brass, back your sizing die out a 1/2 turn. the next firing shouldn't strech at all.
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    hadjiihadjii Member Posts: 976 ✭✭
    edited November -1
    Thanks Everybody. This forum is a never ending learning experience. Thank God for the Internet.
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