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I am tuning a 24" Douglas S.S. #5 taper, 1 in 12 twist, .244" neck 22BR. I have been loading with RL 15 and 40grn nosler ballistic tips I seem to be hung up at 1/2" groups at 100yards. There are only 40 rounds down the bore so break in would be close, now for the strange part. At 28.5, 30,and 31.5grns I took the groups from the targets and overlaied them on each other, perfect match. When powder was increased .05 grn I would get a stray flyer opening the group to 1", this was typical with all three loads.
Do I just change powder and forget RL 15. Varget won't group well and H335 is fair, I have read some about 3031 in short fat cases with good results. I would think with a slow twist of 1-12 I don't need a fast powder. Temps were 40 degrees at 820' elevation.
Reply with quote #2
[/B]"I would think with a slow twist of 1-12 I don't need a [B]fastpowder."
Am I wrong in saying that generally you use slower powders with the heavy projectiles for the specific calibers? The above quote would be opposite of the current thought. Light bullets faster burnpowders and heavy bullets slow powder.
Benchmark?, 3031, BLC2? A Quick look at the 22BR load map right here on this site shows 2230, 332, benchmark, and 2520 as being used with the 40gr Balistic tip.
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Looked at the 22BR info page again and the link to the Ierra loading manual lists faster powders for the most part with the 40 to 45 gr bullets.
I bet N130 would work too.
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I tried RL 7 all the way up to 31grns and had no luck. That was probally where I made a wrong choice and went to slower powers. I will go with some faster burners and see how it groups.
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My 16 twist Pac-Nor 22BR shooting the 40 grain BT loves AA-2015.
Next up was AA-2460..............
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I use 2230 and 2015 with the 40gr bullet. They both work very well in my 22BR.
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I'm using a 1-12 twist, I haven't used 40 grain bullets, but have tested plenty of 50 and 55 grain bullets, by far and away the best powder for me was H322, with Benchmark a close second.
When I'm using 64 grain Bergers I go for either RL15 or N135.
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Thanks for the info guys. I re crunched numbers with Quick Load and switched to a 50grn Nosler Ballistic tip and RL15. Things settled in at 30.2grns of RL15 with a .250" 100yrd group, that's good enough for woodchuck sniping!