Lyman & Green Mountain Chambered Breech Volume
07-25-2010 | 08:54 PM
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Boone & Crockett
Joined: Apr 2007
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From: River Ridge, LA (Suburb of New Orleans)
Lyman & Green Mountain Chambered Breech Volume
I've seen this question pop up on the forums now and then, so I figured I would post my findings.
The chamber in the breechplug of my .54 Lyman Great Plains flintlock is 1 & 1/8 inch deep with a diameter of approximately .36" and holds 25 grains of GOEX FFFg as measured in my TC U-View powder measure.
The chambers in the breechplugs of my several Green Mountain percussion barrels are 15/16" deep with a diameter of approximately .4" and hold 30 grains of GOEX FFFg as measured in my TC U-View powder measure.
The chamber in the breechplug of my .54 Lyman Great Plains flintlock is 1 & 1/8 inch deep with a diameter of approximately .36" and holds 25 grains of GOEX FFFg as measured in my TC U-View powder measure.
The chambers in the breechplugs of my several Green Mountain percussion barrels are 15/16" deep with a diameter of approximately .4" and hold 30 grains of GOEX FFFg as measured in my TC U-View powder measure.
Last edited by Semisane; 07-25-2010 at 08:59 PM.
