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Old 07-23-2019, 11:05 AM
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Greyfox Greyfox is offline
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I can't blame my last excursion into excessive pressure on faulty scales or really even mistakes. Back in the winter I had a barrel chambered in 6 Grinch which is a 6.5 Grendel necked down to 6 and blown forward. The barrel is a 12 twist and I am shooting 80 gr bullets. This being a relatively new wildcat there is little data available and those who have it seem reluctant to share info. So I had to experiment on my own. It took several different powders and some range time with a chronograph, but I came up with a combination that would push that 80 grainer over 3400. Granted, it did crater the primers a bit, but it has been very accurate. The problem showed up when the temperature climbed into the 90's at the last BGSL UBR match. The rifle shot fantastic, but many of the primers were fell out when I pulled the cases and when I tried new primers, almost none would hold them. FWIW- LT 32 is somewhat temperature sensitive.
At any rate, my brass was pretty much trashed. Not only is this stuff expensive, but the necks must be turned and they must be fire formed, so I've looked into rehabilitating them. So far, I've had some success. First I run the case through a ring die which only sizes the base, next I use a handmade tool a friend produced that removes the last tiny curl of brass from the base that the ring die shaves off. Then I have to polish it with emery cloth and finally use another tool by the same friend to reswage the primer pocket. This is not a procedure I want to repeat regularly, so I did reduce the load by 1/2 grain. I tried the resurrected cases a d the slightly reduced load the other day and the accuracy is still there and the primers remain in the case. Life is good!

Rick
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