Does this mean anything? - The HuntingPA.com Outdoor Community
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post #1 of 21 (permalink) Old 05-23-2018, 03:12 PM Thread Starter
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Does this mean anything?

Yesterday shot several 5 round test loads from my Kimber 22-250. In three of the test the patterns there were two separate groups about 1" apart which 2 rounds in each of the separate groups cut holes with the third round very close by one of the groups. All power charges were weight identically on a scale for each type bullet, all brass are from the same Mfg. and were cut precisely to the same length, same CCI primer and all bullets were seated to the same depth. Each group test was with different bullets, All seemed to be a good executed shot with trigger pull and follow through. At times 5-8 mph breeze. Time was spent between shots for the barrel to cool.

Does that tell anything for future loads? No good? Workup loads with more or less power? Try different primers or brass?

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post #2 of 21 (permalink) Old 05-23-2018, 07:28 PM
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My 40x shoots very well with 34.5 grains of IMR 4895 or 33 grains of 8208 XBR with a 55 grain bullet.I use Remington cases and Federal 210 primers.That 5-8 mph breeze might be a bit higher between you and the target at times.I would shoot those groups again to see if it happens again.Don't know what else to tell you a about a power level because you didn't mention where your load is now or your powder choice.
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post #3 of 21 (permalink) Old 05-23-2018, 09:17 PM
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If I were you I would experiment with different seating depths.
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post #4 of 21 (permalink) Old 05-24-2018, 08:44 AM
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Quote:
Originally Posted by Marcus99 View Post
If I were you I would experiment with different seating depths.
Good idea.

Do you know how far off the lands your bullet is when a loaded round is fully chambered? Might be a bullet jump issue.

Good night Chesty, wherever you are......
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post #5 of 21 (permalink) Old 05-24-2018, 09:18 AM
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It doesn't with that small an occurrence.

If it's all the time, with everything, I'd be interested in looking at your bedding, but a couple groups could simply be chalked up to the load specs.

If it happens over and over, then I'd be thinking about how it's been bedded and/or any pressure/contact points in the barrel channel.
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post #6 of 21 (permalink) Old 05-24-2018, 11:13 AM Thread Starter
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O-give is 2.086 as I measured..... I tested 11 sets of loads the double grouping occurred on 3 groups. I did get a 0.535 group with 33.5 grs. of IMR 4895 shooting a 50 gr. Sierra Spitzer #1330. I also tested two other loads that scored at 1/2" and a couple more at 3/4." Best 0.436 with 33.5 grs. of IMR 4895 and a 55gr. Nobler Ballistic tip #39560 O-give 2.080 estimated from book 3,540 fps.

I have a supply of several different bullets and would like to get a good group with each to load up a supply.

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post #7 of 21 (permalink) Old 05-24-2018, 12:27 PM
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It could be the scope.
drags
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post #8 of 21 (permalink) Old 05-24-2018, 02:48 PM Thread Starter
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The scope is a Sightron 6-24X42mm Mil-dot Reticle. It is a few years old but never mounted until last fall.

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post #9 of 21 (permalink) Old 05-24-2018, 03:24 PM
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What rings/bases?

I didn't think of the scope, but it's a valid point.
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post #10 of 21 (permalink) Old 05-24-2018, 04:55 PM Thread Starter
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I have done 36 different test groups and these three split groups only happen in the last 11 group tested. I am not too alarmed, but I thought someone from experience might say...that's happen to me and I changed primers....or I went up or down 1 gr and it improved. I really don't think it is the scope or it would have appeared more often.

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