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Long Range Hunting & Shooting
Twist Rate for 243 AI
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<blockquote data-quote="AZShooter" data-source="post: 1043908" data-attributes="member: 5219"><p>Three of us built three different 6mms to shoot the 115 DTACs. A 6mm Dasher, 6 SLC and a 6mm-284. All were 1 in 7.5 twist 5R bartlein barrels. We had read extensively that a 7.5 twist was necessary to stabilize the 115. Unfortunately the bulk box of 115s we bought didn't shoot. The 6 dasher and 6 SLC shooters were 1000 BR guys and they did every tweak possible but found nothing they would shoot in competition. We all gave up on the 115s.</p><p></p><p>There was a great deal of information on the net regarding my choice of the 6mm-284 suggesting that the 7.5 twist would unravel the 115 Berger VLD. That left us with no 115s to shoot.</p><p></p><p>We all moved to the 107 Sierra MatchKing which shot well in all three rifles. So much for getting that faster twist. </p><p></p><p>Enter the 105 Berger hybrid with a BC that is higher than Berger's 115 VLD! (.547 vs .545)</p><p>The bullet has been launched up to a tad over 3500 fps from my 6mm-284 with no issues.</p><p></p><p>I have a second Bartlein 5R I will be using as a 6 BR. This time I opted for a 1 in 8 twist. I KNOW it will stabilize the 105 Bergers. </p><p></p><p>I would suggest you go with a 1 in 8 twist and not bother with the 115s. Even if you go with the 115 DTAC the small gain in BC over the 105 Berger hybrid will not overcome the advantage due to higher velocity. </p><p></p><p>FYI the 105 Berger kills coues wt just fine.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1043908, member: 5219"] Three of us built three different 6mms to shoot the 115 DTACs. A 6mm Dasher, 6 SLC and a 6mm-284. All were 1 in 7.5 twist 5R bartlein barrels. We had read extensively that a 7.5 twist was necessary to stabilize the 115. Unfortunately the bulk box of 115s we bought didn't shoot. The 6 dasher and 6 SLC shooters were 1000 BR guys and they did every tweak possible but found nothing they would shoot in competition. We all gave up on the 115s. There was a great deal of information on the net regarding my choice of the 6mm-284 suggesting that the 7.5 twist would unravel the 115 Berger VLD. That left us with no 115s to shoot. We all moved to the 107 Sierra MatchKing which shot well in all three rifles. So much for getting that faster twist. Enter the 105 Berger hybrid with a BC that is higher than Berger's 115 VLD! (.547 vs .545) The bullet has been launched up to a tad over 3500 fps from my 6mm-284 with no issues. I have a second Bartlein 5R I will be using as a 6 BR. This time I opted for a 1 in 8 twist. I KNOW it will stabilize the 105 Bergers. I would suggest you go with a 1 in 8 twist and not bother with the 115s. Even if you go with the 115 DTAC the small gain in BC over the 105 Berger hybrid will not overcome the advantage due to higher velocity. FYI the 105 Berger kills coues wt just fine. [/QUOTE]
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Twist Rate for 243 AI
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