ASSRA Forum - Sorting cases for repeatable accuracy

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Sorting cases for repeatable accuracy - worthit? (Read 771 times)

Pentz Senior Forum Member Offline Funf und Zwanzig mit den Hut Posts: 434 Location: Vancouver, WA Joined: Sep 4^th, 2014	Sorting cases for repeatable accuracy - worthit? Jan 4^th, 2025 at 4:23pm	Print Post
	Although most of our matches at Clark are CBA we, and Paul Bunyan have one or more ASSRA target matches per season for a challenge and a change. I've fired 248s and 249s but as yet no 250s. 32-40 using CCI LRM primers under 13.2 - 13.4 of 300 MP. I am debating if sorting cases that have performed well is worth the time and effort, and using those with seemingly repeated accuracy for record shots. Is this a rabbit worth chasing? I know that BP Jack loads at the bench with one case. others?

	ASSRA Member Yoostabe # 11497
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frnkeore Frequent Elocutionist Offline Posts: 7448 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Sorting cases for repeatable accuracy - worthit? Reply #1 - Jan 4^th, 2025 at 4:36pm	Print Post
	It's possible that it could help but, is a lot of extra time. Back in the '90's, when there was a CBA club here, a dear friend, Etz (Griz) Johnson was a CBA record holder. What he did was prep the cases, weight, neck turn, chamfer the necks and inside of the primer hole, bring all to the same length and maybe a few other things I have forgotten. Then, after all that, he would shoot groups and any case he though was shooting out of the group, he would throw a way. I always liked shooting one case but, CBA and ISSA don't give enough time to do it.

	ASSRA Member #696, ISSA Member #339
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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 16885 Location: Oregon Joined: Feb 2^nd, 2009	Re: Sorting cases for repeatable accuracy - worthit? Reply #2 - Jan 4^th, 2025 at 5:23pm	Print Post
	I'd be more inclined to just breech seat and use the same case all through a match. Then there's no question even between the same brand of cases. I'd also consider always indexing that same case into the chamber the same direction too. Pick some place on the headstamp and always point it at 12 or 6 o'clock.

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bpjack Frequent Elocutionist Offline Posts: 3173 Location: East Olympia, WA Joined: May 18^th, 2008	Re: Sorting cases for repeatable accuracy - worthit? Reply #3 - Jan 4^th, 2025 at 5:24pm	Print Post
	au contraire monsieur Frank I shoot single case at the Puyallup CBA matches with time to spare. You do lose out on wing reading time, but I have always shoot fast anyway. I cut a notch in the case rim to speed up orientation. Jack

	ASSRA # 11318 I haven’t lost all my marbles yet but there is definitely a hole in the bag somewhere.
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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 11734 Location: Why, out West of course Joined: May 29^th, 2006	Re: Sorting cases for repeatable accuracy - worthit? Reply #4 - Jan 4^th, 2025 at 6:33pm	Print Post
	I use preloaded cases in the 32 Miller Short only. All others just one case. Yes, it's worth it if you take the time to actually study your wind flags for reference. Plenty of time in ISSA matches to use one case. I've always assumed, 357 Mag case volumes are closer from case to case than 32-40 cases because they are much smaller and made in much greater number.
	« Last Edit: Jan 4^th, 2025 at 6:56pm by westerner »
	A blind squirrel runs into a tree every once in a while.
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frnkeore Frequent Elocutionist Offline Posts: 7448 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Sorting cases for repeatable accuracy - worthit? Reply #5 - Jan 4^th, 2025 at 7:25pm	Print Post
	In my "case", shooting a 357 Max case in a Borchardt, I have to lay the charged case on top of the breech block and raise it to the chamber then, push it in and I can't be in a hurry doing it. Plus, I'm old and slow

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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 11734 Location: Why, out West of course Joined: May 29^th, 2006	Re: Sorting cases for repeatable accuracy - worthit? Reply #6 - Jan 4^th, 2025 at 8:37pm	Print Post
	Not easy with a 32-40 either Frank. But you still got plenty of time. My Borchardt 25 Ackley Krag with a scope on it is a real pain. And that's fixed ammo! Seems to me I figured an easy way one day but don't/can't remember how.

	A blind squirrel runs into a tree every once in a while.
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fishoot Full Member Offline Posts: 137 Location: Folsom, CA Joined: Dec 29^th, 2011	Re: Sorting cases for repeatable accuracy - worthit? Reply #7 - Jan 13^th, 2025 at 8:21am	Print Post
	Long ago when I shot highpower service rifle, I would weigh cases and sort them by weight. There are statistical methods of figuring arithmetic Mean, Median, and Mode for ranges of numbers. I would plot the weights into a spreadsheet and let Microsoft Excel do the math. The cases within a few grains of the median were my 600 yard slow fire cases. The outliers were for 200 yard standing or sitting as they are not nearly as critical. I did all the basic case prep work too, making sure primer flash holes were inside reamed. Cases were routinely trimmed also. I also neck turned the 600 yard cases. To answer your question, it gave me more confidence that my cases were the best I could achieve. Any confidence boost is helpful.


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