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Shooting & Reloading - Mausers, Big Bores and others >> Muzzleloaders & Blackpowder

Tatume
.400 member


Reged: 09/06/07
Posts: 1091
Loc: Gloucester, Va USA
Zihn/Rigby rifle
      05/08/08 12:16 AM

Hello Folks,

After pondering the relative effectiveness of the Rigby-style muzzleloading rifle Steve Zihn built for me, I decided to compare the
Taylor Knock Out index (TKO) to some cartridge guns. To give some idea of the magnitude involved, here is a photo of the ball next
to a round of 454 Casull ammunition. The ball is perched atop a 45 Colt case.



TKO was proposed by John “Pondoro” Taylor as an index of killing power on large, dangerous game. It is calculated as the product of
projectile mass (in lbs), speed (fps), and diameter (inches).

TKO = (grains * muzzle velocity * diameter) / 7000
TKO muzzleloader = (430 * 1800 * 0.665) /7000 = 73.5
TKO 458 magnum = (500 * 2250 * 0.458) / 7000 = 73.6

Recoil is comparable too. It looks like the gun is up to any job I put it to.

Take care, Tom

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Entire topic
Subject Posted by Posted on
* Zihn/Rigby rifle Tatume 05/08/08 12:16 AM
. * * Re: Zihn/Rigby rifle Dphariss   07/08/08 01:53 AM
. * * Re: Zihn/Rigby rifle szihn   07/08/08 02:06 AM
. * * Re: Zihn/Rigby rifle Tatume   06/09/08 10:18 PM
. * * Re: Zihn/Rigby rifle szihn   07/09/08 02:12 AM
. * * Re: Zihn/Rigby rifle Tatume   26/10/08 06:04 AM
. * * Re: Zihn/Rigby rifle DarylSModerator   15/11/08 06:58 AM
. * * Re: Zihn/Rigby rifle szihn   26/10/08 07:07 AM
. * * Re: Zihn/Rigby rifle mehulkamdar   26/10/08 11:55 AM
. * * Re: Zihn/Rigby rifle richla   26/10/08 12:07 PM
. * * Re: Zihn/Rigby rifle tinker   07/09/08 02:49 AM
. * * Re: Zihn/Rigby rifle szihn   07/09/08 03:51 AM
. * * Re: Zihn/Rigby rifle richla   26/10/08 03:13 AM
. * * Re: Zihn/Rigby rifle tinker   26/10/08 04:46 AM
. * * Re: Zihn/Rigby rifle AzGuy   05/08/08 05:37 AM
. * * Re: Zihn/Rigby rifle Tatume   05/08/08 06:08 AM
. * * Re: Zihn/Rigby rifle szihn   05/08/08 11:08 AM
. * * Re: Zihn/Rigby rifle Marrakai   05/08/08 12:43 AM
. * * Re: Zihn/Rigby rifle szihn   05/08/08 02:44 AM
. * * Re: Zihn/Rigby rifle Tatume   05/08/08 03:04 AM
. * * Re: Zihn/Rigby rifle szihn   05/08/08 04:51 AM

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