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Joined: Dec 2001
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My goodness! Just open the rim by .002–isn’t going to hurt a single thing. Believe me, Boswell wouldn’t have hesitated a split second to do it. Zero affect on originality. It may be that the chamber reamer originally used was smaller than normal. People act as though components are available on every street corner. Not!


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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).







2201221208

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.

Last edited by Tom Findrick; 01/24/22 12:03 PM.

“When faith is lost, when honor dies, the man is dead” - John Greenleaf Whittier
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Originally Posted by 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).







2201221208

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

.

So have I. I have a bunch in fact. They are not comparable for a lot of reasons. Your eyes. Not mine.


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BrentD, (Professor - just for Stan)

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Originally Posted by Joe Wood
My goodness! Just open the rim by .002–isn’t going to hurt a single thing. Believe me, Boswell wouldn’t have hesitated a split second to do it. Zero affect on originality. It may be that the chamber reamer originally used was smaller than normal. People act as though components are available on every street corner. Not!

I had this problem a few years ago with an English 20 ga side-by-side. Got my smith to open the rim. Worked perfectly and could use any ammo that I wanted.

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A quick look at the SAAMI drawing for the 12 gauge shell indicates the maximum rim diameter to be .886", with a remarkable amount of tolerance on the low side (.021").

This is of course the dimension one would expect AA shells to be at or under. The chamber specification is .887".

AA shells seem to measure .882 to .883 here, fired or sized in a Grabber. STS shells here measure .875 to .877. Both meet SAAMI spec.

If you want the gun to chamber ANY SAAMI spec shell, the rim cut will need to be .887".

Only you can decide if this is a acceptable. The gun predates any SAAMI or CIP standards.

Personally, I'd leave the rim cut alone and just use STS cases for my reloading. They are not particularly scarce. Yet.

Grinding on the rim of a AA is not the brightest thing you can do. The rim is not solid. The brass case head is formed from sheet stock in a die. The rim is therefore hollow.

While the rim is not part of the pressure vessel per se, making it thinner invites a partial case head separation which at minimum would be inconvenient.


"The price of good shotgunnery is constant practice" - Fred Kimble
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DaveB Offline OP
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Shotgunjones, I appreciate all the information.

You have confirmed that my AA’s measure the same as yours,.882”. At .880, they fit into the gun no problem.

Also, thank you for the Remington STS measurement. It gives me another hull to look for. The Cheddite/RST measures .875”, so that’s on my list as well.

I have decided to not open up the rim cut and just try and scrounge up some STS’s or Cheddite’s.

I really appreciate everyone who has contributed to the thread. Thanks to you all!

Last edited by DaveB; 01/24/22 08:22 PM.
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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.


"As for me and my house we will shoot Damascus!"
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