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Post by sw on Jan 24, 2009 10:15:39 GMT -5
Lloyd, Some thoughts...Increasing the initial pressure rise is most easily obtained by increasing the primer powder. This is done to get quicker and more consistent bullet obturation which should lower ESs. Your ESs are extremely low now. However, I would consider increasing the primer powder 1 and the 2 grains and with very careful(the norm for you anyway - obviously) loading cleaning practices see if the ESs decrease even more. When I first started shooting the 14/61 load with 250XTP/shortMMP.Win209,WW, I often would have a string of 10 shots with all velocities within 5'/sec, occasionally 3 shots could be 2630,2630,2631. Others noticed the same unbelievably small veloicty variance. The point is, when the bullet resistance is very consistent and a quick pressure rise occurs, extreme consistency can be obtained. Possibly, you could still reduce the variance. I have noticed that with these faster twist barrels, both 45 and 40, generally the faster and especially the higher the pressure is, the more accurate the load tends to be. My very high pressure hunting load in the 40(11/46 4759/2015 200SST - 2670'/sec), is incredibly accurate - 5 shot groups touch @ 100 yds consistently. I suspect a little more pressure will tighten your groups and slightly help trajectory. This morning I am putting 2 Benelli recoil reducers in the stock of my 40 cal and mounting my Weaver T-36 scope - this is to wring out what it can really do.
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Post by Harley on Jan 24, 2009 11:25:44 GMT -5
Good luck this morning, Steve. A few years ago I sold my Leupold 36X; wish I had it back.
Harley
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Post by Richard on Jan 24, 2009 19:34:24 GMT -5
Harley.......I have a nice Leupold 24x target scope that would would be ideal for your purpose. Richard
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Post by Harley on Jan 24, 2009 22:22:20 GMT -5
Thanks, Richard, but I already have the Leupold 6.5-20 target.
Harley
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Post by edge on Jan 26, 2009 19:09:01 GMT -5
Edge, I don't understand why not seeing the aim point is a problem for you. SNIP In your first post you wrote:"Yesterday was the first time I ever fired the .45 Pac-Nor at targets set past 100 yards. At 100 yards my groups had averaged close to 1/2" using a load of 12/47 SR4759/A2015, a wool wad, Parker 275BE and the CCIM primer." IMO, if I have an accurate load at 100 yards and the POI is not near the POA ( disregarding elevation ) then I would think that the load/bullet combo is suspect! You have two different groups! Without an aimpoint, the top group could be 6 inches left and the bottom group could be 6 inches right! Now that you showed the aimpoint, it is obvious that the groups are indeed falling where they should be. edge.
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Post by Harley on Jan 26, 2009 19:43:17 GMT -5
Okay, Edge, I see your point: When you say "without an aimpoint" you really mean without relative aimpoints for the two different groups. You're right, of course.
Harley
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Post by deadeye on Jan 26, 2009 22:52:09 GMT -5
Edge, here are the groups relative to the aim points. I hope you see something significant. I should add that the group with MV of 2269 was 9.5" low; the 2304 group was 7" low. Thanks. Harley i am curious at looking at these bullet holes,the first 5 all are darker(residue?) the last 3 very clean?
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Post by Harley on Jan 26, 2009 23:04:50 GMT -5
Sharp eye, Deadeye; I had shot through white paper on the second group in an effort to create strikes my spotting scope could see. I removed the paper before photographing the group.
Harley
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Post by chuck41 on Jan 26, 2009 23:59:40 GMT -5
At 300 yds I think those were pretty good targets.
I especially like your procedure of using a white target in front. Then you can put the bull where ever you like.
Course the guys on this board do that anyway. ;D ;D
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Post by deadeye on Jan 27, 2009 0:26:10 GMT -5
chuck41,leave it up to you to reveal the cover-up! harley-just all in fun! ;D ;D ;D
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Post by Harley on Jan 27, 2009 9:46:45 GMT -5
Chuck and Deadeye, I know you two are joking, but I HAVE been wondering if someone would question my honesty. Two years ago, when I first posted some really good groups obtained after super-cooling my .50, a couple of people challenged me to prove myself. Since then I've been really careful not to let powder burns appear on any targets I shoot.
Harley
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Post by edge on Jan 27, 2009 12:02:09 GMT -5
With the aiming point, the two group centers are only about 1/2 inch apart with regard to windage, so clearly the only real issue is getting the deviations down! I would say that the load needs very little tweaking edge.
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Post by Harley on Jan 27, 2009 14:45:39 GMT -5
I agree with you, Edge; I'm very satisfied with this load. As for the deviations, that's a little murky right now. What we're talking about is "extreme spread". I've got to find out why I required ~8 shots before that spread stabilized at what I'm used to seeing. Other than the distance, my only changed variable was using RB's BP instead of my usual Pete's.
I am scheduling a day of comparing, from clean barrels, Pete's and RB's plugs. Maybe there's a difference that will show up. I'll shoot at 100 yards in order to take some of the wind out of the results, but it's the chrony readings that I'm most interested in.
Harley
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Deleted Member
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Post by Deleted on Jan 27, 2009 17:20:25 GMT -5
Harley, do you have any idea how many shots you have fired through petes plug?
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Post by Harley on Jan 27, 2009 17:30:58 GMT -5
Bill, I've fired 49 shots through Pete's plug. I have an email out to him right now, because I have some questions about the bushing aperture.
Harley
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