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I may be the minority here, I’ve shot up to .007 side by side against.0015 with ZERO effect on accuracy.what is the acceptable runout measuring at the ogive, I get anywhere from .002 to .005 and keep the lowest runout for match cases
just curious... long bearing surface bullets? maybe they 'self-align'? i shoot a lot of light for caliber bullets with short bearing surfaces that might have more potential for spinning off axis.I may be the minority here, I’ve shot up to .007 side by side against.0015 with ZERO effect on accuracy.
So I just moved on to more important things.
J
Hey Chop’just curious... long bearing surface bullets? maybe they 'self-align'? i shoot a lot of light for caliber bullets with short bearing surfaces that might have more potential for spinning off axis.
maybe i should purposely load some crooked ammo and test![]()
what is the acceptable runout measuring at the ogive, I get anywhere from .002 to .005 and keep the lowest runout for match cases
What is the grinding process you use on your seating stems to match your bullets?In my experience, it depends on the rifle. Having said that, it is also my experience that runout of more than .003 on the bullet ogive will change the point of impact on target. I primarily shoot at 100 yards. Thats all my range has. I have worked thru my loading process and equipment to minimize runout. I rarely see more than .002. What made the biggest improvement was switching to F/L non-bushing sizing dies that use an expander ball to set the neck tension. If you have banana brass, a good die will straighten them out. It may take running the shell thru the die a few times, turning it in the shell holder each time. I use Whidden f/l non-bushing dies. The next biggest improvement was to get seating stems ground for each of the bullets I shoot.
Also, I take the slop out of the die-to-press fit before I tighten the lock ring on the die.
If you jam the bullet (As in 30BR) wouldn't that be "self aligning?Imagine what moving that bullet does to neck tension? Get good brass, set up right with good dies and dont waste your money on a concentricity checker
Quest450,"I agree with this!... I have done this myself and it does make a huge difference when the ojive fits the stem and not seating off the tip!"
Wayne
the 21st century seater is custom made for the case and bullet you're shooting, you have to send three resized cases and three bullets and they'll make you a custom seating die
Quest450,
At one point I worked for ATK and I had access to a optical Compariter and had our machinist make them for me now I’m not sure I have use a bullet and lapping compound that seemed to help but I’m still shooting the same components right now but for future builds I may have t