28 Nosler Range report
- Thread starter jezzolo
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DrMike
Ballistician
- Nov 8, 2006
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Looks as if you have a great deal of good intel on the loads you might use. The rifle will shoot, that is obvious. I would be inclined to focus on the Retumbo load that gave such good accuracy. I'd reproduce that load. If it is reproducible, that would be the end of the matter.
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I did. That was the 1st picture. I did a ladder test last week and that was at 81.5gr and seated at 3.435 So I then adjusts the seating depth out more and then put it back to th original then dropped it bay .1 down to 81.2 thru 81.4 with not good results as the 81.5
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OU812
Handloader
- Apr 18, 2006
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I just want to make sure I'm understanding correctly, you want to try and tighten a .331 3 shot group in a hunting rifle? You could adjust power slightly up/down and see if it tightens or swap primers. If it were me I would stop right where you are at, be happy as hell with the results, shooting some longer range groups and go kill something. You got a great load worked up go and enjoy your efforts. 
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OU812":5v9fnduv said:I just want to make sure I'm understanding correctly, you want to try and tighten a .331 3 shot group in a hunting rifle?
Yes exactly and Yes, I dropped down to 81.2 and 81.3 and 81.4 all with the same seating depth of 3.435 and none of them where better than the 81.5 charge.. I also seated the 81.5 charge out further and the groups opened up. I HOPE just neck sizing will bring it in a tad. May even go deeper with the seating depth. All shots where on a cool barrel... took me forever to do this . Lol Any thoughts on the deeper seating depth or is it just trial and error?
OU812
Handloader
- Apr 18, 2006
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Might try different primer and see if it tightens. Wish I could be of more help when it comes to trying to squeak out the last little bit of accuracy in an already very accurate load but in all honesty I've never done it. I usually am the reason a group opens or closes slightly once an accurate load is found. I hope you are able to shave off the extra and find the accuracy your looking for.
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Well I wonder if it was the wind, it was about 5-8mph wind high of 12 at one point according to a gizmo my buddy was using. Anyway I have a ton of cci 250mag primers so I won’t be changing those. Well I’ll seat them a little deeper and see what reaction I will get out of it. I hope with the neck sizing and a calmer day I’ll be happier.. Thanks for your help.
OU812
Handloader
- Apr 18, 2006
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jezzolo":1zxuf0dj said:
A 5-8 mph wind will move the bullet that is for sure, even at 100 yards. AB bullets do like a jump no doubt so that can't hurt. I too hope a calmer day and neck sizing shrinks the group size for you. Keep us posted.
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- Oct 30, 2004
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velocity?
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Not sure.... don’t have a chronograph... that’s another step I need to do yet... but 26in barrel , 81.5gr of RETUMBO, 160gr AccuBond (bc .531 and sd .283) and 250 CCI primers. Anybody have a computer program that can plug in that information and give an estimate?
It's probably 10 times harder taking a .331 group to .231 than it is going from a .431 to .331! Everything matters at that point. Are you weight sorting your brass? Are you weight sorting your bullets? Are you using an ogive comparator to length sort your bullets? Checking the concentricity on your loaded ammo? The skill and technique required to shoot groups that small is a whole other topic. You're doing pretty good I'd say. Consider the things I've mentioned.
