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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles

500grains
.416 member

Reged: 16/02/04
Posts: 4732
Loc: Salt Lake City, Utah USA

Re: 400H&H and 465H&H any rifles available yet?
18/08/06 03:38 AM

An increase in velocity exacerbates bullet yaw. More bullet yaw means earlier tumbling which in turn means shallower penetration.

Going to a faster twist rate decreases bullet yaw (up to a point, but going with a super fast twist such as 1:4 can increase it again). Decreased yaw means later tumbling which allows for greater penetration.

A faster twist rate also increase pressure, but this only matters if your loads are right on the edge of what is safe in the rifle.

So why did the old 460 Wby with a 1:18 twist penetrate more shallowly than a 458 win mag with a 1:14 twist? The 460 bullet had too much yaw.

Also, it is important not to confuse twist rate with rotational velocity of the bullet. Increasing twist rate (say from 1;18 down to 1:10) provides the bullet with more stability in flesh. Increasing the rotational velocity (say using a 1:18 twist, but adding 200 fps to the muzzle velocity) increases yaw and tends to decrease stability of the bullet.

So how much yaw is too much? The amount that makes your bullet tumble in flesh before it comes to rest within the animal.

Here is an article that has some info on the topic:

http://www.gsgroup.co.za/articlepvdw.html

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Subject	Posted by	Posted on
400H&H and 465H&H any rifles available yet?	RLI	21/06/05 01:38 PM
Re: 400H&H and 465H&H any rifles available yet?	Anonymous	23/04/08 01:09 AM
Re: 400H&H and 465H&H any rifles available yet?	mussd0	14/08/06 09:11 PM
Re: 400H&H and 465H&H any rifles available yet?	Mike_McGuire	14/08/06 11:32 PM
Re: 400H&H and 465H&H any rifles available yet?	500Nitro	14/08/06 11:47 PM
Re: 400H&H and 465H&H any rifles available yet?	500Nitro	14/08/06 10:51 PM
Re: 400H&H and 465H&H any rifles available yet?	500grains	14/08/06 11:06 PM
Re: 400H&H and 465H&H any rifles available yet?	rgp	21/06/05 02:54 PM
Re: 400H&H and 465H&H any rifles available yet?	450_Ackley	21/06/05 05:17 PM
Re: 400H&H and 465H&H any rifles available yet?	NitroX	21/06/05 01:47 PM
Re: 400H&H and 465H&H any rifles available yet?	RLI	21/06/05 06:11 PM
Re: 400H&H and 465H&H any rifles available yet?	NitroX	21/06/05 08:27 PM
Re: 400H&H and 465H&H any rifles available yet?	Mike_McGuire	22/06/05 12:05 AM
Re: 400H&H and 465H&H any rifles available yet?	mussd0	09/05/07 01:17 PM
Re: 400H&H and 465H&H any rifles available yet?	NitroX	22/06/05 12:49 AM
Re: 400H&H and 465H&H any rifles available yet?	500grains	22/06/05 12:54 AM
Re: 400H&H and 465H&H any rifles available yet?	NitroX	22/06/05 01:39 AM
Re: 400H&H and 465H&H any rifles available yet?	Mike_McGuire	22/06/05 02:09 AM
Re: 400H&H and 465H&H any rifles available yet?	BFaucett	22/06/05 11:49 AM
Re: 400H&H and 465H&H any rifles available yet?	atkinson6	01/07/05 02:38 PM
Re: 400H&H and 465H&H any rifles available yet?	Minkman	02/07/05 02:59 AM
Re: 400H&H and 465H&H any rifles available yet?	Mike_McGuire	02/07/05 03:39 AM
Re: 400H&H and 465H&H any rifles available yet?	BFaucett	02/07/05 06:35 AM
Re: 400H&H and 465H&H any rifles available yet?	atkinson6	04/07/05 04:42 AM
Re: 400H&H and 465H&H any rifles available yet?	chuck375	15/10/07 04:21 AM
Re: 400H&H and 465H&H any rifles available yet?	Nakihunter	15/10/07 10:14 AM
Re: 400H&H and 465H&H any rifles available yet?	chuck375	15/10/07 12:29 PM
Re: 400H&H and 465H&H any rifles available yet?	hoppdoc	14/08/06 09:59 PM
Re: 400H&H and 465H&H any rifles available yet?	mussd0	15/08/06 09:57 PM
Re: 400H&H and 465H&H any rifles available yet?	500grains	16/08/06 03:45 AM
Re: 400H&H and 465H&H any rifles available yet?	mussd0	16/08/06 08:36 PM
Re: 400H&H and 465H&H any rifles available yet?	500grains	17/08/06 02:33 AM
Re: 400H&H and 465H&H any rifles available yet?	bonanza	09/05/07 08:50 PM
Re: 400H&H and 465H&H any rifles available yet?	dnovo	09/05/07 10:44 PM
Re: 400H&H and 465H&H any rifles available yet?	aktoklat	12/05/07 03:41 AM
Re: 400H&H and 465H&H any rifles available yet?	AzGuy	12/05/07 04:50 AM
Re: 400H&H and 465H&H any rifles available yet?	Marrakai	17/08/06 12:50 PM
Re: 400H&H and 465H&H any rifles available yet?	500grains	18/08/06 03:38 AM
Re: 400H&H and 465H&H any rifles available yet?	Mike_McGuire	14/08/06 11:25 PM
Re: 400H&H and 465H&H any rifles available yet?	500Nitro	21/06/05 06:19 PM
Re: 400H&H and 465H&H any rifles available yet?	RLI	21/06/05 06:29 PM

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