Hello:
Im interested in brass 410 cases too.
I read where the 444 Marlin case could be used but im having some troubles at the moment anyway of finding 444 brass.
Id be interested in finding even just 5 ct empty 444 marlin brass just to try out loading the brass.
Its my understanding that the 444 marlin brass will fit the 410 shotgun but since the brass internaly is more room due to thin brass over thick plastic hulls that you have a very loose fit for the wads shotcup.
So i was hoping to find just a few to see what i could come up with for a better fit ect.
Shoot id even buy more if i could find it .
Anyone had any experience with brass 410 case reloading that they could add loads they used or other info ect ?
I even read that a 9.3x74R case could be chamber fired to make 410 brass cases but thats even harder for me to find- Oh well ill keep my eyes and ears open cuz they will show up somewhere id think eventualy.
Head Shot
It would be very useful to have more length than the .44 case. Magtech appear to do a 2½in. .410 case, although there may be errors on their web page. .410 isn't 36 gauge, but about 67 gauge, and they certainly aren't 2½in. in diameter.
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Failing that, 9.3x74R brass, if fireformed, should be even better, since it gives you 2.94in. length. RWS brass is likely to be expensive, but of very high quality which might pay in the long run. It may be available at less cost from Sellier and Bellot. The 9.4mm. Baenziger in Bertram brass is often described as the same as .410, but it is only about 2½in. long. Both of these probably have too much rim thickness, but you don't even have to turn them down. If you have someone make you a dummy chamber with rim recess in a steel block, you can squash the rim thinner in a large engineering vice.
Head diameters are listed as:
.410 .465in.
.303 .455in.
.444 Marlin .470in.
10.3x74R Baenziger .462in.
If you have to do some case thinning without a lathe, I'd suggest a mandrel made to fit an electric screwdriver, and a carpenter's rebate plane.
All conventional shotgun chambers and bores are designed around the old paper cases, so even plastic cases are too thin to make the interior equal the bore size. Plastic wads are designed to take up this difference, and probably would with brass. An exception (and like most, a resurrected old idea) is the current fashion for guns with a larger than standard bore. but so far as I know this hasn't extended to .410s, and certainly not to fairly old ones.
The old brass cases were sometimes (not always) used in special guns with a bore very close to chamber diameter. With conventional guns they sometimes (not always) had a glued in paper liner to reduce that step down to bore diameter. It was considered unwise to use unlined brass cased rounds with a conventional bore, but I haven't heard of mishaps from it. If you do this with non-sleeve wads, I would make sure they are soft felt or fibre, and I would roll the edges lightly in lube, not saturate the whole wad with the stuff. You would need card wads to make the seal, as poor patterns will result if gas leaks among the shot.
Conventional shotgun rounds depend for consistency of ballistics, on consistency of the pressure required to push out the roll or star crimp. That slightly oversized main wad might compensate for the absence of this tension. Certainly one very effective way of making something consistent is to make it zero, and on overshot wad lightly held by adhesive or wax comes close to that.
Some of the early brass cases were loaded with a sort of loose star-crimp formed by four indentations at the mouth, holding an overshot card. Most of us would prefer to avoid this, with expensive brass, so we can lightly glue the top wad. I'd use heat-melting glue-sticks. The overshot wad must be as flimsy as will do the job. Doughnut patters were common if the wad remained intact in the middle of the shot stream.
I think the people who say the use of the .410 in the field is a mistake or a stunt, are right some of the time. All shotguns, if the choke is equal, throw a pattern of about the same diameter, and at about the same velocity. The .410 will produce bird-sized gaps at ranges you would want to shoot birds. But where rabbits break cover at seven or eight yards and find other cover at twenty, there is nothing better for taking a quick shot and recovering an unminced rabbit.