Case weight variation

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sean4570
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Posts: 7
Joined: Wed Nov 03, 2021 2:49 pm

Case weight variation

Post by sean4570 »

I am considering converting some loaded LC and TW crimped blanks into 300 BO.
I cut one each of LC and TW dumped powder and weighed both cases.
There was a difference of 3.1gr between each.
I normally weigh new cases (sorted by head stamp) on a bell curve.
What should be the cut off on the high and low end of the weights?
Some years ago I had worked up a load for my Rem. 700 .223 using Remington cases and found a very accurate combination.
A while later I loaded the same load into Federal cases and when I fired one it blew out the primer and flowed back over the extractor, trashing it
I had failed to weigh the Federal cases and found them to be 13-14gr heavier! meaning less capacity= higher pressure.
So I pulled all of the heads loaded in the Federal cases, but have not tried to work up a load in them.
My main question is if I make 300 BO cases out of mixed head stamps, What high/low weight variation in cases yield a decent load?
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