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**smoothy8500** · 09-29-2018, 1:14 PM

Originally posted by JTROKS

My Win 70 HBV 22-250 with a 1-14 twist will produce gray streaks when I load up with Winchester 64 grain PP bullets.

That's odd, it seems to go against conventional wisdom concerning heavier projectiles in a slow twist?

**LynnJr** · 09-29-2018, 1:27 PM

Its surface area barrel length and friction that destroys bullets rotational forces run roughly 18,000 psi while acceleration runs 128,000 psi.
Berger Bullets had the engineers at MIT look at there bullets when they were getting poofs at 80 yards and that is when they went to the thicker jackets.

Berger bullet failure test

http://benchrest.com/showthread.php?49336-Berger-bullet-failure-test

First I want to thank Mid Tompkins for doing so much to make this test possible. Without him it would not have happened. Also I want to thank Sherri Hurd and Michelle Gallagher for their part in putting 950 shots down range using a 6.5X284 in a little over 6 hours. You both earned those sore...

**smoothy8500** · 09-29-2018, 4:11 PM

Thanks Lynn, that was an interesting read.

**JTROKS** · 09-29-2018, 11:45 PM

Originally posted by smoothy8500

That's odd, it seems to go against conventional wisdom concerning heavier projectiles in a slow twist?

**LynnJr** · 09-30-2018, 8:17 AM

Originally posted by smoothy8500

Thanks Lynn, that was an interesting read.

Back then we had a lot of good posters on that forum who really grasped engineering and bullet flight.

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