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Rifles, Reloading, Optics, Equipment
Reloading
.243 AI Loading Question
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<blockquote data-quote="westcliffe01" data-source="post: 790531" data-attributes="member: 35183"><p>I see the problem... Your 9 twist is providing marginal stability with the 95's. I had an original 26" 9.25 twist barrel and my groupings with the 95gr VLD's were pretty awful (1-2"). So you have a "true" 1:9 and your grouping has been a little better, but you have to shoot them with basically a max load to spin them fast enough to stabilize. Then combined with a long throat in a barrel that can basically never shoot heavy VLD's ? Mine (1:8x26") is now grouping 1/2" at 100 with fireforming loads (41gr H100V) and I have back calculated the MV as 3400fps, based on a 6" drop from 100 to 285 yards. I have not yet started loading in the fireformed cases, but did get a batch of 105gr VLD's this last week that I will be loading up.</p><p></p><p>Quit while you are ahead and get yourself an 8 twist barrel with a "normal" throat. Mine is a Shilen. I don't know how your action is set up - Remington type Tenon ?</p><p></p><p>The 243 Win is a popular caliber so Jim at NSS will probably have a batch of barrels coming in in a few weeks. He has a version that is made with a barrel nut for the Remington type action. Installing it requires no gunsmithing and just a $30 go gauge. They should be $~320. You will probably recover some money by selling the original barrel to someone shooting varmint bullets at 4000fps, for which it will be fine.</p></blockquote><p></p>
[QUOTE="westcliffe01, post: 790531, member: 35183"] I see the problem... Your 9 twist is providing marginal stability with the 95's. I had an original 26" 9.25 twist barrel and my groupings with the 95gr VLD's were pretty awful (1-2"). So you have a "true" 1:9 and your grouping has been a little better, but you have to shoot them with basically a max load to spin them fast enough to stabilize. Then combined with a long throat in a barrel that can basically never shoot heavy VLD's ? Mine (1:8x26") is now grouping 1/2" at 100 with fireforming loads (41gr H100V) and I have back calculated the MV as 3400fps, based on a 6" drop from 100 to 285 yards. I have not yet started loading in the fireformed cases, but did get a batch of 105gr VLD's this last week that I will be loading up. Quit while you are ahead and get yourself an 8 twist barrel with a "normal" throat. Mine is a Shilen. I don't know how your action is set up - Remington type Tenon ? The 243 Win is a popular caliber so Jim at NSS will probably have a batch of barrels coming in in a few weeks. He has a version that is made with a barrel nut for the Remington type action. Installing it requires no gunsmithing and just a $30 go gauge. They should be $~320. You will probably recover some money by selling the original barrel to someone shooting varmint bullets at 4000fps, for which it will be fine. [/QUOTE]
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Reloading
.243 AI Loading Question
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