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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing

DarylS
.700 member

Reged: 10/08/05
Posts: 27711
Loc: Beautiful British Columbia, Ca...

Re: 16 bore conical, what twist?
05/02/13 09:34 AM

The rate of twist depends pretty much on slug length, Casper, and some on speed, but that is of less importance then length.

The Greenhill Formula, when using the constant of 150 works for lower speed projectiles -up to about 1,500fps or 1,600fps.

The number derived from the Greenhill formula is the 'slowest' rate of twist for that length projectile, not the optimum rate.

Or, you can go here.
http://kwk.us/twist.html

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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Subject	Posted by	Posted on
16 bore conical, what twist?	casper50	05/02/13 04:23 AM
Re: 16 bore conical, what twist?	DarylS	05/02/13 09:34 AM

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