I keep running my bullet stability software and it tells me to run a 7 twist on these bullets in the 2800 to 2950 fps range for my .243 build. I can find lots of 8.5, 8, 7.5 twist barrels but no 7 twist. What are you 6mm guys running? Seems awful fast to me.
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Re: Correct Barrel Twist-6mm 115DTAC or 107SMK
No pressure problems with that?
No pressure problems with that?
Re: Correct Barrel Twist-6mm 115DTAC or 107SMK
Thanks guys.
Thanks guys.
Re: Correct Barrel Twist-6mm 115DTAC or 107SMK
I have a box of both the coated and uncoated DTAC bullets, should I be aware of any difference when I load?
I have a box of both the coated and uncoated DTAC bullets, should I be aware of any difference when I load?
Re: Correct Barrel Twist-6mm 115DTAC or 107SMK
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 19Scout77</div><div class="ubbcode-body">Too fast a twist and too slow velocity. 26" 7.5 twist 115 dtacs should be right around 3k without issue. </div></div>
This.
I'm running molyed 115DTACs @ 3070fps easy from a 26" Rock 5R, 1:7.5" twist. GAP Match chamber...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 19Scout77</div><div class="ubbcode-body">Too fast a twist and too slow velocity. 26" 7.5 twist 115 dtacs should be right around 3k without issue. </div></div>
This.
I'm running molyed 115DTACs @ 3070fps easy from a 26" Rock 5R, 1:7.5" twist. GAP Match chamber...
Re: Correct Barrel Twist-6mm 115DTAC or 107SMK
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 2shots</div><div class="ubbcode-body">I have a box of both the coated and uncoated DTAC bullets, should I be aware of any difference when I load? </div></div>
It has been my experience that uncoated actually run a little faster with the same load and no more pressure. The only reason I use the coated is that a buddy gave me a couple thousand when I built my .243. YMMV.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 2shots</div><div class="ubbcode-body">I have a box of both the coated and uncoated DTAC bullets, should I be aware of any difference when I load? </div></div>
It has been my experience that uncoated actually run a little faster with the same load and no more pressure. The only reason I use the coated is that a buddy gave me a couple thousand when I built my .243. YMMV.
Re: Correct Barrel Twist-6mm 115DTAC or 107SMK
I thought the whole reason for running the moly is less friction so more velocity. Or maybe since its lower friction it's less pressure, so less velocity. I'm confused.
I thought the whole reason for running the moly is less friction so more velocity. Or maybe since its lower friction it's less pressure, so less velocity. I'm confused.
Re: Correct Barrel Twist-6mm 115DTAC or 107SMK
I've shot 115's with an 8-twist with no issues. But theoretically in cold temperatures near sealevel, the 8-twist could become marginal. A 7.75-twist will put you in the safe zone under all conditions.
I've shot 115's with an 8-twist with no issues. But theoretically in cold temperatures near sealevel, the 8-twist could become marginal. A 7.75-twist will put you in the safe zone under all conditions.
