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Rifles, Reloading, Optics, Equipment
Reloading
Bullet jump vs throat erosion
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<blockquote data-quote="Mikecr" data-source="post: 1910211" data-attributes="member: 1521"><p>Efforts in the article attempt to prove/disprove this sentiment: <em>Benchrest World Champions and other experts explained that when seating bullets close to the lands, changing bullet jump by 0.002-0.005 inches can potentially have a dramatic affect precision. </em></p><p>If <u>BR world champions</u> was IBS 100-300yd, they're likely centered on 6PPC. There are 2 factors with that unrelated to what everybody else in the entire shooting world needs from seating.</p><p>#1 ITL seating is needed for high enough starting pressures to reach the extreme peak pressures of a competitive 6PPC.</p><p>#2 Tweaking of seating merely shapes grouping, but for competitive point blank BR, group shaping IS dramatic. Everything is dramatic.</p><p></p><p>The next matter I would mention about the article is that their focus was on pressure change sensitivities within 30thou of touching. Yes you affect pressure as you near touching because it raises starting pressure. But best seating is not about pressure or tuning. Best seated position is about resolving bullet-barrel interface issues otherwise. </p><p>Tuning changes from gradual raising/lowering pressures are best handled with actual neck tension adjustments (not what the mob thinks tension is), or adjusting kernels of powder. </p><p>Leave best tested seating right where best is.</p><p>This is the reason you should NEVER test for best seating from a tuned node. Those BR shooters are adjusting from a tuned node. Adjusting(tweaking), NOT full seating testing.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1910211, member: 1521"] Efforts in the article attempt to prove/disprove this sentiment: [I]Benchrest World Champions and other experts explained that when seating bullets close to the lands, changing bullet jump by 0.002-0.005 inches can potentially have a dramatic affect precision. [/I] If [U]BR world champions[/U] was IBS 100-300yd, they're likely centered on 6PPC. There are 2 factors with that unrelated to what everybody else in the entire shooting world needs from seating. #1 ITL seating is needed for high enough starting pressures to reach the extreme peak pressures of a competitive 6PPC. #2 Tweaking of seating merely shapes grouping, but for competitive point blank BR, group shaping IS dramatic. Everything is dramatic. The next matter I would mention about the article is that their focus was on pressure change sensitivities within 30thou of touching. Yes you affect pressure as you near touching because it raises starting pressure. But best seating is not about pressure or tuning. Best seated position is about resolving bullet-barrel interface issues otherwise. Tuning changes from gradual raising/lowering pressures are best handled with actual neck tension adjustments (not what the mob thinks tension is), or adjusting kernels of powder. Leave best tested seating right where best is. This is the reason you should NEVER test for best seating from a tuned node. Those BR shooters are adjusting from a tuned node. Adjusting(tweaking), NOT full seating testing. [/QUOTE]
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Bullet jump vs throat erosion
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