Marlin Issues.

[georgerkahn]

It has a lot to do with cartridge overall length. If you load 38 to .357 length, they will function. The timing of the carrier does not rise fast enough to stop the second shorter round from entering the action. Hence, letting in two, causing the jam. Raising the nose of the carrier causes it to lift earlier and prevents the second round from leaving the magazine. Hope this helps.

Indeed it does, shootinfox2, and a big THANK YOU! Frankly, I'm gonna' just keep the "38 ONLY!" label on... too scary for this old fart to, perhaps, have a .38 S&W round not sufficiently not-seated -- to be, say, .001" short! But, thanks to you, I now know the reason why.
geo

[Good Cheer]

Always wanted to try this .375x45-70 in a Marlin. Just never got around to it.

[Rrusse11]

"Always wanted to try this .375x45-70 in a Marlin. Just never got around to it." Good Cheer

It of course has been done, the 38-56, but with so much taper on the body of the case, that ballistically it didn't improve much over the 38-55.
With an Ackley improved style cartridge, should offer significant advantages. On the modern 1895 however, you still run into the weakening of the
action with ejection port cut outs to take the oversized 45-70 rim. The 450M with the change in barrel thread style/depth, would, I suggest,
make for a stronger, more capable cartridge. You'd need to start with a 338MX chamber/bore. Get JES to rebore and then a custom reamer,
with the belt.

On the original large frame Marlin 1895, at least there's more meat in the barrel threads to receiver. Then you run into heat treating and metallurgy
of the larger frame. Possibly a CCH receiver would help. Definitely food for thought on how to get a stronger action.

My $.02

[rusty marlin]

Putting the radius on the cam, can cause the Marlin Jam. Be prepared to follow the fix for the Dread Marlin Jam I published some years ago.
You can find the write up here:
https://www.ktgunsmith.com/marlinjam.htm

[rusty marlin]

Indeed it does, shootinfox2, and a big THANK YOU! Frankly, I'm gonna' just keep the "38 ONLY!" label on... too scary for this old fart to, perhaps, have a .38 S&W round not sufficiently not-seated -- to be, say, .001" short! But, thanks to you, I now know the reason why.
geo

There's no need to be restrictive, should you chose to "fix' this.
My 94 in 44Mag will feed anything from extra long 44mags with 320 grain bullets to .44 russian wad cutters.
Its all in the adjustment of the carrier.

[Baltimoreed]

Good thread. I shoot cas and installed a one piece firing pin eons ago in my .45 Cowboy Limited. Eventually had the ‘jam’ but a piece of coping saw blade and jbweld has fixed it and held up for 20 years. I believe the .45colt guns are more forgiving than the .38s are. Mine runs any weight bullet and Schofield loads.

[W.R.Buchanan]

Putting the radius on the cam, can cause the Marlin Jam. Be prepared to follow the fix for the Dread Marlin Jam I published some years ago.
You can find the write up here:
https://www.ktgunsmith.com/marlinjam.htm

In the article you published you say to put a .025-.035 radius on he Snail Cam. In your post you say don't do it? Is this a typo? I got the fix off Paco Kelly's www.Leverguns.com in 2005.

It was a well known fix for this problem for 30+ years, JM Marlin knew about it and never chose to fix it.

I did about a.015 radius on mine, the whole idea is to eliminate the sharp edge that scrapes away at the bottom of the lifter.

Randy