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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Crimp-Velocity
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<blockquote data-quote="Capt RB" data-source="post: 2792292" data-attributes="member: 85987"><p>I don't crimp but have found increasing neck tension to as much as .007 has improved sd/es and accuracy in slow for application powders. I have more than few loads that have .0005-.002 in small cases and start there in overbore cases. Crimping can act the same way if you cannot adjust neck tension. </p><p> With my 270 H4831 has .002 neck tension 8es over 5 shots and will shoot sub 1/2moa Same gun same bullet case and primer RL26 shoots tighter groups with es of 3 over 5 shots. But only with .007 neck tension I turned the neck down and that load opens up everywhere. Would a crimp be a better option. I will never know. </p><p> I read something from Kirby Allen about RL33 wanting some resistance during ignition to clean up es/sd quite awhile ago. I started looking at that with slower burn rates and have found I can clean up most load numbers with just more neck tension. Some examples are RL19 and RL26 sd's went from low teens to single digit 10 shot es and sub 3fps sd in 6.5CM</p><p>The above 270 load </p><p>7rm for both my brother and myself run .004 or.005 with retumbo and RL26 both are below 11es</p><p> Bottom line light neck tension works with faster powders in moderate cartridges very well. It can work well in tighter chambers as well as when using just a neck sizer. When it doesn't don't be afraid of clamping the **** out of a bullet to find a load. It may just be whats needed to get a consistent enough ignition to make your rifle preform like you hope it will.</p></blockquote><p></p>
[QUOTE="Capt RB, post: 2792292, member: 85987"] I don't crimp but have found increasing neck tension to as much as .007 has improved sd/es and accuracy in slow for application powders. I have more than few loads that have .0005-.002 in small cases and start there in overbore cases. Crimping can act the same way if you cannot adjust neck tension. With my 270 H4831 has .002 neck tension 8es over 5 shots and will shoot sub 1/2moa Same gun same bullet case and primer RL26 shoots tighter groups with es of 3 over 5 shots. But only with .007 neck tension I turned the neck down and that load opens up everywhere. Would a crimp be a better option. I will never know. I read something from Kirby Allen about RL33 wanting some resistance during ignition to clean up es/sd quite awhile ago. I started looking at that with slower burn rates and have found I can clean up most load numbers with just more neck tension. Some examples are RL19 and RL26 sd's went from low teens to single digit 10 shot es and sub 3fps sd in 6.5CM The above 270 load 7rm for both my brother and myself run .004 or.005 with retumbo and RL26 both are below 11es Bottom line light neck tension works with faster powders in moderate cartridges very well. It can work well in tighter chambers as well as when using just a neck sizer. When it doesn't don't be afraid of clamping the **** out of a bullet to find a load. It may just be whats needed to get a consistent enough ignition to make your rifle preform like you hope it will. [/QUOTE]
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