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Discussion Starter #1
Over the long weekend I took a Cerosafe cast of my Winchester "Timber Rifle" and a .45-70 Marlin Guide Gun. Both chambers pretty well match the SAMMI drawing in the NRA Reloading book pg. 288/289 (I think).
There is virtually no throat, the rifling starts within a 1/16" of the cartridge case.
Its sure no wonder that we have to seat bullets deep.
 

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Yes. The chamber is just longer than the trim length. Then it abruptly funnels down to the barrel diameter. The rifling starts immediatly.
I wanted to see the difference between the cut chamber on the Marlin and the Hammer forged Winchester barrel. I couldnt tell any difference.
The cast is hard to measure where the chamber stops and the rifling starts but they sure appear to closely match the drawings in the NRA book.
Both chambers are free of any visible tooling marks.
I heated the action and barrel with a hair dryer to get a cast with as few wrinkles as possible.
 

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Discussion Starter #4
P.S.

I measured the twist on the Winchester and came up with 1 turn in 12 inches!

I dont think my patch was slipping in the rifling.
I have never heard 1 in 12 mentioned for the Winchester. Has anyone else measured one?
 
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