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Guns & Ammo, Van Zwoll, Grey Bull

 
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Old 02-05-2010, 08:02 PM
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Guns & Ammo, Van Zwoll, Grey Bull

Van Zwoll teamed up with Grey Bull and laid down a pretty good long range hunting article in the current Guns and Ammo. One paragraph addressed "precession" and the bullet "going to sleep" over distance. I have heard differing viewpoints on this subject, but what Van Zwoll describes has mirrored what I have experienced at the range with long, heavy for caliber, VLD bullets.

"Precession, or the rotation of a bullet's nose about its axis, increases drag but is generally greater near the muzzle than down range, when the bullet's spin overcomes the physical flaws that cause precession. Like a top that "goes to sleep" as it recovers from the force that spun it, a bullet can become more stable as it travels, shedding drag and actually shooting tighter groups (in minutes of angle) at long range than it does up close. Thats why a rifle that prints one-inch groups at 100 yards may give you two-inch groups at 300, even 400 yards."

I've seen more than one rifle struggle to get sub-moa at 100yds with max load, heavy, long for caliber vld bullets but then impressively print sub moa groups at 1000yds.

Good food for thought when developing a long range hunting load with these VLD bullets.
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Old 02-05-2010, 10:56 PM
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Re: Guns & Ammo, Van Zwoll, Grey Bull

Yeah, I have been told that several times. I guess it is one of those things that you have to get the ".5MOA at 100yrds" theory a break. I have tried to start shooting reloads at longer distances to get a more accurate read of what the bullet is doing. Thanks Mo!

Tank
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Old 02-05-2010, 11:08 PM
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Re: Guns & Ammo, Van Zwoll, Grey Bull

Do you think this theory only applies to VLDs or to similar non-VLD bullets? If not why do you suppose only VLDs?
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Old 02-05-2010, 11:30 PM
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Re: Guns & Ammo, Van Zwoll, Grey Bull

Interesting those two would team up. I've read a number of Van Zwoll articles over the years in 'Bugle' and have come away with a fairly strong feeling that he's not fond of the idea of long range hunting. I'd like to read that article.
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Old 02-05-2010, 11:32 PM
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Re: Guns & Ammo, Van Zwoll, Grey Bull

Quote:
Originally Posted by Chas1 View Post
Do you think this theory only applies to VLDs or to similar non-VLD bullets? If not why do you suppose only VLDs?

In general, I believe the theory goes that is is more of an issue for long for caliber bullets. Some good discussion on this in Bryan Litz's book.
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Old 02-06-2010, 12:37 AM
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Re: Guns & Ammo, Van Zwoll, Grey Bull

Based on my limited experience I feel its the long heavy for caliber bullets that may take more time to "go to sleep". Particularly the Berger VLD'S. Some of the rifles I've had experience with would put together sub .5 groups @ 100yds with regular mid weight boat tails but with the heaviest available bullet for that caliber it took a bunch of load development and range time to get that same rifle to squeek under 1 moa @ 100. But it would hold .7 moa @ 1000.

Twist rates are probably a factor in all this also. A twist rate too fast or too slow would surely have some effect.
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Old 02-06-2010, 12:54 AM
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Re: Guns & Ammo, Van Zwoll, Grey Bull

Its good the long range hunting segment is getting some main stream attention by a main stream writer like Van Zwoll. It doesn't surprise me too much, Van Zwoll is a rifleman, he prides himself on marksmanship in the field, appreciates an accurate rifle, and lives to hunt big game.

Kudos to the guys at GreyBull, based on the article, they made Van Swoll a believer. Looks like they had him on the range ringing steel at 800yds and in the field dropping mule deer with 180 7mm Bergers.
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