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BrentD, Prof, FelixD, GLS, Imperdix, John Roberts, Stanton Hillis, Ted Schefelbein
Total Likes: 11
Original Post (Thread Starter)
by DaveB
Hey guys, I just received a Charles Boswell box lock I had brought in. Gun was made in 1905.

I am going over the gun and everything is as advertised. The peculiar thing is the gun won’t close all the way with a Winchester AA HS hull. No problem with an RST (Cheddite) hull. Upon closer examination, the O.D. of the Winchester brass rim is .002” larger than the RST. The rim diameter is just large enough that it won’t fit into the rim cut in the chambers of the barrels to allow the gun to close. I filed down the rim on the Winchester .002” and then it fits properly to allow the gun to close. Does anyone know if it is an easy fix for a gunsmith to open up the I.D. of the chamber rim cut .002”, as to allow the use of Winchester hulls? Has anyone else run into this?
Liked Replies
by Stanton Hillis
Stanton Hillis
Would you rather modify it than just use appropriate loads in it that will seat properly? I'd think over that decision very carefully if it were mine.
3 members like this
by Imperdix
Seems a shame to mess with something that`s been ok for almost 120 years !!!! Personally I`d be using approprate cartridges .
2 members like this
by DaveB
Some photos for those interested

[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
2 members like this
by dogon
My first thought; Is this a once fired AA hull you're using? If that's the case it may be fire-formed to the chambers & rims of the gun the hull was fired from.

I have a model-21 Winchester that I had a similar problem with. The once-fired AA hull was tight in the chamber & it wouldn't let the gun close. I then tried a new AA shell and it dropped right in & the gun closed without an issue. My conclusion was the once fired hull had expanded to the chambers of the gun it had been fired in previously.

Just a thought.
1 member likes this
by mc
It's a no brainer to buy a collet to resize the case head or buy ammo that works
1 member likes this
by Tom Findrick
Tom Findrick
Originally Posted by BrentD
Originally Posted by DaveB
I did try adjusting the sizing collar down on my MEC 600 and it not did make a difference. I just need to ultimately switch over to the Cheddite hulls and for the time being figure out a way to remove the .002” on the AA’s.

If you start filing the rims on those cases, do you not run the risk of compromising the case and blowing a hole? That's folded steel or brass, and if the former, you will also encourage corrosion.

It's a no brainer to hone the rim recess. It just isn't worth the trouble or risk of rupturing a case. But they are your eyeballs (hopefully safely behind glasses).


I’ve seen shotgun hulls with no metal head, so I doubt the plated steel has any structural function.

If AA cases are a must, I would go the extra mile on resizing.
If not, just use a brand of cases that work.

Modifying the gun would be my last choice, just because there’s always the chance of something going wrong, even a UPS screw-up.

Lovely gun, OP.
1 member likes this
by 12boreman
Just use a small oval file on the rim cut. Takes about 15 minutes per barrel. I have had to do this on about 5 of my doubles. You can buy a cheap 8 file set at Home Depot or other hardware store. Just go slow and the result are fantastic.
1 member likes this

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