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Location: Idaho
Joined: 02/28/2006
Posts: 162
Keyholing, any suggestions?

I just had a custom barrel put on my .223 wssm. I had them do an 8 inch twist so I could shoot 75-80 gr. slugs with it. When I got it I tried some 75 gr. a-max loads but at 25 yards the slugs hit the paper sidways. Definately not stabalizng. Could it be a twist issue or a reloading issue what could I check for? The rifle shoots 64 grain factory loads perfecly and some 53 grain triple x's were awesome too. The bigger bullets definatly not leaving the rifle with a center spin at all. I'm completely baffled, unless the gunsmith made an error. Would a slower twist destablize them enough to do that?
Hank

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Joined: 12/03/2005
Posts: 1691
Keyholing, any suggestions?

I have not done any work with a 223, but this is what I'd do first.Reduce powder charge to near minimum and work it up. If still no difference, I'd repeat with a slower burn-rated powder.

Don Fischer's picture
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Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3190
Keyholing, any suggestions?

Use a bronze brush on a cleaning rod and check the twist rate first. What load are you using?

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Joined: 12/03/2005
Posts: 1691
Keyholing, any suggestions?

Here's a link that is free to determne twist rate. May come in handy.

http://www.z-hat.com/twistrate.htm

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Location: Idaho
Joined: 02/28/2006
Posts: 162
Keyholing, any suggestions?

I started with 33.0 gr.s of h4895 and worked up to 35.2 gr.s which are the hodgson published loads. I'll check the twist, I didn't think to use a brush and rod. I double checked with the gunsmith and he said 1 in 8 inch twist is what is on there and he has a really good reputation. The max loads showed absolutely no signs of pressure. Do you think more speed might = more stability? Thanks for the help so far guys.
Hank

Don Fischer's picture
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Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3190
Keyholing, any suggestions?

I just looked it up in my Hornady manual and I think there's a good chance that H4895 is too fast. Think I would step up to one of the 4350's. Heavy bullet's usually do better with slower powder's.

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Location: Idaho
Joined: 02/28/2006
Posts: 162
Keyholing, any suggestions?

I tried Varget which is a little slower, but the difference is minimal. I worked from 2 grains below starting loads to 2 grains over the max. Not one shot made a round hole in the paper at 25 yards, always oblong. The hottest loads still showing no pressure signs. Next time I buy powder I'll get a much slower burning powder and try it. I'll also try some 55 and 60 grain loads and see how they shoot.
Hank

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Location: Nova Scotia
Joined: 08/17/2002
Posts: 1762
Keyholing, any suggestions?

I love Varget and use it in many loads. It is a bit more expensive but worth it and extremely accurate as well. Thumbs up

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