10MM Rimmed case

[usrguns]

Has anyone ever attempted to get some rimmed cases for the 610, so you do not have to use moon clips?  I am new to this forum and would like to know your thoughts.

[tommac919]

Thinking you would have to make them yourself....  41 mag cases maybe

[usrguns]

Actually have a custom ammunition friend who thought of this and is attempting to make some for me to try for him.  If they work he is going to make me a bunch to play with!!  He might also offer them to other 10mm shooters if there is a market for them.

[oldman10mm]

Since I shoot/reload both 10mm and 41M,a 10mm die will/does size down a 41M case to 10mm size except for the solid head area in the primer area. That section/area would have to be machined down. Once that's done,trim to length and it should work. I'll make one up and do a picture.

[BEEMER!]

I would think that the 41 case would have to be neck reamed once it is trimmed also.

Maybe not?

I dislike messing with moon clips also.  I just shot my 610 with out them and picked the cases out by hand.

[sqlbullet]

41 magnum base diameter is too big.  Not sure how you would size it all the way down with the rim in the way.

I would start with 30-30 brass if it was my project.  It would have to be inside reamed after trimming to length, and you may wish to cut the rim down a bit as the rim is huge on the 30-30.

But, otherwise it is a good match.  As you would expect since it is in the parent lineage of the 10mm.  30-30-> 30 Remington -> 10mm Auto.

[oldman10mm]

In reply I said I would do pic.

41M made into a 10mm. Trim length is that for 10mm. The lower head end that is solid and not sizeable with the 10mm die had to be spun in the drill press and a file was used to reduce that diameter.
41M on left,standard 10mm on right.



both inserted in a 610 as far as they would go in against the chamber shoulder,a moon clip would hold the 10mm out a little further by a few thousants. the 41M doesn't go in far enough to seat against the rim so it would have to be trimmed slightly shorter than a 10mm trim length. both would go in a little further once a crimp was applied with a finished cartridge.

[Pinsnscrews]

Nice work! Thanks for taking the time to do that.

[oldman10mm]

Also,added note,measuring from rim down to bottom solid head area,the modified 41M case has 7% less capacity than the 10mm case. So without going to a slightly faster burn rate powder,velocities would be slower. But for reduced power target loads,it would be nice to insert cartridges as a normal revolver,even though for competition events,removing a moon clip full of spent cartridges and reloading with a full moon clip of ammo will always be faster.
Potentially,shorten the 41M even more for a rimmed 40S&W case.
Sometime in the future,I'll be making 12 to simulate 10mm and 12 to simulate 40S&W,probably not till late winter and then I'll post back.

[happy trails]

" He might also offer them to other 10mm shooters if there is a market for them."

I'd be interested in such a product.

[oldman10mm]

Tried a different parent case as suggested in post#6,a 30-30.
Much easier,just required a tube cutter cut at the proper dimension.

10mm,41Mag,30-30

trimmed case length a little more compared to previous post so they would seat against cylinder.
Rim diameter on the 30-30 is virtually the same as the 41m. Since the 610 is an N frame and is used for 45 LC,rim diameters will not contact each other.

wall thickness for the 10mm and 41Mag is .009",30-30 is .012". Have to see if a bulge from seated bullet will cause a problem

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[oldman10mm]

Finally acquired a box of Herters 401 Powermag ammo at today's Akron show, so now this project from about 5 years ago can move forward.
I'll start by pulling apart one of them, de-prime and throw the brass in the wet tumbler, run it thru the 10mm sizer and trim length to 10mm spec.
I'll report as info is acquired.

[The_Shadow]

Randy Shelley made some rimmed 10mm magnum cases (not what parent case was)

[oldman10mm]

Disassembled 10 of them, ran them thru a 10mm sizer die, left 2 of them at original length, trimmed 8 to length. Of those 8, one used for a dummy round (no powder or primer) to assess visual, one used for a cutaway to assess internal visuals, and 6 to be used in 610 for load testing.

[oldman10mm]

The 401 Mags contained a 200gr LRN bullet and 11.0grs of powder. Being that the ammo was made in Sweden, I wouldn't guess what the powder was.