.410 problems

jjohnwm

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I recently picked up an interesting little gun about which I know nothing. It's a sleek little .410 single shot bolt action made by BSA, marked as having a 2 1/2 inch chamber. The barrel is approximately 24 inches in length, and the gun weighs probably about three pounds. The rotating bolt head is reminiscent of a Lee Enfield .303, and there is a large safety lever at the right rear of the bolt that pivots up for safe, down for fire. The gun cocks on closing and is in excellent condition, aside from a couple of dents and scuffs on the stock.

Upon arriving home with my new little toy I scampered out back with a handful of Federal factory 2 1/2 inch loads, and was disappointed to find that they would not chamber. The brass base barely begins to enter the chamber before becoming too tight to go further. I can see nothing in the chamber that would cause this, and both chamber and bore are clean and rust-free. The single hook extractor takes a good bite on the rim and hauls the stuck cases out, with the help of a couple of taps on the bolt handle. I tried several shells out of the box, thinking that perhaps one of them was out of spec or damaged...no luck. I haven't tried any other brands of shells as yet.

Am I missing something obvious here? I know I will probably have to enter the 21st century and figure out how to post pics, but I thought that I'd throw this out here quickly now. Any ideas would be appreciated.
 
Don't know if this could have anything to do with it.

The correct case for the .44 shotgun is essentially the basic .44-40 case. The rim diameter is .525 inches, and the base diameter (diameter just forward of the rim) is .471 inches. These dimensions are almost identical to the .410. The problem is that the .410 case is nearly straight at .471, while the .44-40 case tapers to a diameter of about .457 inches just .9 inches ahead where it has a small shoulder and then a short neck with a diameter of just .443 inches. Thus, a .410 case, even if shortened, should be too fat to go very far into the chamber. Overall length also is a problem. The .44-40 case is about 1.31 inches, while the .410 cases are 2, 2 1/2, and 3 inches long.



Mind you if your gun is marked 2 1/2" chamber I guess the above info is ruled out.
 
I suggest that you order some cerrosafe from Brownell's and do a chamber cast, then compare careful measurements of the cast with the SAAMI drawings for the .410
I'd bet you will learn something useful.
 
Thanks guys...I had Cerrosafe years ago and used it all up doing unnecessary chamber casts that I didn't really need. Now I need some and don't have it!

Thanks for the lead, Tigger. I'll be ordering some.
 
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