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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Pointing your own rounds
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<blockquote data-quote="BryanLitz" data-source="post: 1018604" data-attributes="member: 7848"><p>This is something I've considered doing; going back and re-testing many of the more popular bullets in their 'pointed' configuration and providing the BC's and custom drag models for those.</p><p></p><p>Of course one complication/question will be: what pointer did you use, and how will the BC / drag model be different for the pointer I used?</p><p></p><p>Shooting every variation of pointer is not practical, not to mention the differences in how individuals 'set' their dies.</p><p></p><p>But fortunately, I don't think any of that matters very much. Of course there will be minor differences in pointing methods/tools, but they will probably be indiscernible; certainly small in comparison to natural bullet lot variations. So the real distinction is: pointed or not pointed when it comes to BC and drag modeling.</p><p></p><p>The lab is running at full steam but there's no reason we couldn't add this to the list, especially for the more common bullets used in ELR shooting where the custom drag models are used.</p><p></p><p>For BC modeling, it's pretty easy to increase the BC input by a certain % depending on how much you're pointing. But there's currently no way to modify a custom drag model to account for pointing.</p><p></p><p>BTW, I use the Whidden die. John contracted me to design the tipping inserts and I remember doing a lot of research as to how closely the shape had to match the tip of the bullet. I found there was a small benefit to be had by getting the shape to match perfectly, but not much. The current design with 3 tip angles to choose from covering all bullets leaves little-to-no room for improvement in terms of drag reduction. Other bullet pointers which offer custom ground tipping inserts for specific bullets may produce a more visually appealing transition, but the difference in terms of drag is insignificant. The main difference is 'pointed or not pointed', and there you're only looking at an average of 5% increase. To go beyond this and ask: 'what is the shape of the pointer', now you're down in the weeds of less than 1%.</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 1018604, member: 7848"] This is something I've considered doing; going back and re-testing many of the more popular bullets in their 'pointed' configuration and providing the BC's and custom drag models for those. Of course one complication/question will be: what pointer did you use, and how will the BC / drag model be different for the pointer I used? Shooting every variation of pointer is not practical, not to mention the differences in how individuals 'set' their dies. But fortunately, I don't think any of that matters very much. Of course there will be minor differences in pointing methods/tools, but they will probably be indiscernible; certainly small in comparison to natural bullet lot variations. So the real distinction is: pointed or not pointed when it comes to BC and drag modeling. The lab is running at full steam but there's no reason we couldn't add this to the list, especially for the more common bullets used in ELR shooting where the custom drag models are used. For BC modeling, it's pretty easy to increase the BC input by a certain % depending on how much you're pointing. But there's currently no way to modify a custom drag model to account for pointing. BTW, I use the Whidden die. John contracted me to design the tipping inserts and I remember doing a lot of research as to how closely the shape had to match the tip of the bullet. I found there was a small benefit to be had by getting the shape to match perfectly, but not much. The current design with 3 tip angles to choose from covering all bullets leaves little-to-no room for improvement in terms of drag reduction. Other bullet pointers which offer custom ground tipping inserts for specific bullets may produce a more visually appealing transition, but the difference in terms of drag is insignificant. The main difference is 'pointed or not pointed', and there you're only looking at an average of 5% increase. To go beyond this and ask: 'what is the shape of the pointer', now you're down in the weeds of less than 1%. -Bryan [/QUOTE]
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