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444 Marlin to 410
Unread 12-09-2020, 06:04 PM   #1
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Paul Harm
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Default 444 Marlin to 410

There's a thread over on shotgunsports.com titled the same. Some of us at the club shoot 410s and got interested in having brass shells - Magteck seems to be out. The fellow tried 444 Marlins [ creedmoorsports.com - 64$/100 ] . The rim is a bit too thick by a couple of thou so he sanded them down. I ordered some 444, but while I was waiting I found some 40/72 cases and did the same. My cases were a bit too small in diameter for the plastic wad so I punched some fiber ones out with a 7/16 punch. They worked pretty good. Well. that sanding down was a bit more than I wanted for a hundred so I got looking at the 40/72s and noticed the underside of the rim is flat, or parallel with the back. A couple of swipes with a wedge file to bevel the rim and bingo, the SxS closes real nice. So, when my 444 cases come a little file work and I'll be ready. The guy found it took a OP card to seal up good - the plastic wad was a bit too small. He used a hot glue gun on top of the OS card. Other guys claim the 410 is the most forgiving when it comes to a crimp. One guy claimed it didn't matter just so long as the shot doesn't fall out.We'll find out in a couple of days.
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Unread 12-26-2020, 01:54 PM   #2
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I noticed a shotgun chamber where the rim sits is on a angle and the rifle brass is square. So I chucked up the shell in my 1/2" hand drill and using a round chainsaw file I beveled the underside of the rim. They now sit nicely down in the chamber. The 444s are bigger in diameter than the 40/72s so some circlefly 410 wads were ordered [ they're a bit bigger than my 3/8 cut ones.] So, with the OP card and plastic wad and 13.2grs of 410 powder I get a nice load. I do have to cut the finger of the wad part way off so there's enough room for everything. These are a bit more work than I expected.
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Unread 12-26-2020, 02:07 PM   #3
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good luck with the brass loads they should be good loads out to 30 yards or more....charlie
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Unread 01-13-2021, 03:20 PM   #4
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Playing around with them. I got up to 14.5grs of 410 powder and no OP card, just the plastic wad, and a overshot card. I'm about out of room with 14.5grs of powder. The barrels don't have a lot of residue and a friend doing my test firing is in 20s at a round of skeet. He thinks they shoot just like his regular reloads with plastic shells. I found the OS card needs to be glued in good - about a 1/8" of hot glue along the walls of the shell, over the card. Just using carpenters glue does have enough resistance for a good powder burn. Had one shell crack for about 3/4" back. So I just annealed all the shells hoping they'll fire form a little better. A new shell measures .450 and a twice fired .470. I'll check after the next firing. It's been a fun learning process while this virus crap is keeping many of us home. Just glad we're still shooting three times a week.
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