9.3x74r is what i was thinking about. can be made into 3 inch shells. What I cant figure out is resizing. Would a 44 pistol resizing die work with the bolt and pin for removing the primer taken out work? Or is the hole too small for the case to go all the way through it?

I would look at a 460 S&W die and run it in as far as you can you might need to trim them some

44 is really .430

you already know 45lc works in a 410

45lc are only 1.285 long
454 cassul is a little longer and a 45lc fits in it and fires fine

460 S&W is longer yet 1.8" and both can be fired from it all shoot a .452 bullet

you could maybe use a 45-70 die the case is a little longer yet but the bullet size is .458 and the case has more of a taper to it than 460

you would still be short in length

call this company and backorder yourself a set
https://www.buffaloarms.com/410-shotgun-4d-die-set-standar-4d410.html

midway sells the brass ready to relaod in 2 1/2 https://www.midwayusa.com/product/1013139744

Are you thinking along the lines of a 3 inch 444 marlin case? If you haven't come across it type in "Lore of Arms" by Colin Riley he fireforms 303 brit to 410 and does not resize might work for a longer case, expanding the neck the neck can't hurt imo

With the pin removed from the resizing die is there enough room for the case to go through the die so it can go all the way in? I can easy knock the primer out with a punch.

That factory die includes a bullet seating die apparently. I would have no use for that

didn't the brits take a bunch of 303s and make them single shot 45-70 round ball guns for the Indian security officers in colonial India?

as smooth bore guns in 45 cal with a round ball they were fine for close security detail but were easily out ranged and out fired by the 10 round 303brit cartridge and rifle

444 marlin would work if the case could go through the die with the decapping pin removed. the 444 case is only 2 inchs long

SAMMI says the brass base of a 410 shell is .468 The hulls after firing in my gun measure .472 If I don't resize loading them could be a pain. Some are going to be tight.

My vision was your asking if a 44 pistol die would expand the neck and i was thinking a 444 die would give a little more length However for the sake of conversation/rambling on a case made to handle 45-50,000 c.u.p compared to a 410 loading,s 10-12,000 l.u.p may not need resizing

rifle cartridge rims probably are thicker then 410's so you may have to file to get the breech closed 45 colt doesn't have much of a rim

Rim thickness on 9.3x74r is .055 on a 410 its .053 I want to full length resize to avoid loading problems. I dont think .002 difference in the rim will be a problem. Rim diameter of 410 is .525 and 9.3x74r is .526. Again I dont see a problem. 2.941 is the length of 9.3x74r. After fire forming I may need to trim it a bit but I suspect it will be somewhere around 2.75 (complete guess) A 444 case has a slight taper. .47 at the base which is close to brass size on a 410 which is .468 (after firing the brass on a 410 shell in my gun is .472) and tapers to .453 at 2.225 inches. The plastic on a 410 shell is .455. I think that 9.3x74r brass will work and so will a 444 resizing die so long as there is room for it to get through the hole where the decapping pin goes.

I was hoping somebody else had tried this before I start spending money. The low pressure of a shotgun that brass ought to last a good while

How are you getting any of these to accept a 209 type primer?

I will use rifle primers

large rifle would be my guess
take way more pressure than a 209 needs to