Louis,
The Cowboy stuff should work fine in a trapdoor. The only factory ammo recommended other than that is the standard Remington 405 gr loads.
Also don't shoot jacketed bullets in them, as the metal is a bit softer than modern steel and jacketed bullets are hard on the rifling.
Ron
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I Still Need DWM side plate #49... if anyone runs across a nice one.
What ~Rudyard Kipling~ said...
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