doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com .410 reloading question

KYjon, what are the loads for shot for .410 with Unique, 452, and Herco, and where are they published? I repeat, they are way too fast for .410 loads and the pressures are way too high. Educate me on fireforming. I think that fireforming usually involves a projectile.

You can fireform cases with shotgun pressures, too. I learned this while reading an article about using the 9.3 X 74R cases for a .410. The author gave the load specs to do so.

The source says that 8 grs. Herco and a full case of Cream of Wheat supposedly will do the trick.

If only I could get ahold of one of these to try in a gun before buying 50. https://www.grafs.com/retail/catalog/product/productId/76364

quite a few varieties of 9.3x74r brass available from Dave Gullo (aka Buffalo Arms).
https://www.buffaloarms.com/catalogsearch/result/?q=9.3x74r

Looks like you can even buy a single case for $2.79 (Norma), but there are 3-4 other makers in different quantities.

.405 Winchester looks ballpark close, but too short. The 9.3/.410 is interesting. I imagine it would be at least a reasonable grouse gun.

Hey Stan,
In case you were curious, I measured some new Nosler brass, rim diameter .524", rim thickness .054", head diameter .464", length 2.93".

I had a similar thought as what you're thinking, but other little projects, happen. If you aren't in a rush, monitor the Nosler website, it seems they just had a sale that puts the cost of their brass, at about what you're considering with the Privi brand. I never loaded any, but I recall figuring out that a 41 mag seating die would put enough of a crimp to hold an overshot card. I was going to try filling the bullet seating cup with epoxy, so it would be more or less flat.

I may have read it wrong, but you mentioned opening up the primer pockets? Why not just use large rifle primers? Anyway, best of luck with the project.

Thanks, Craig. I read that even if you do use LR Primers you need to "clean up" the pockets on this brass. Having never seen it in hand I cannot say for sure. Others advocated opening the pockets enough for shotgun primers. Lots of conjecture and "what ifs". And, Gil made a good point earlier. It may not be possible to get "all brass" shotshells pressure tested. I'll send an email to Armbrust to see.

Thanks for the info, and thoughts.

Stan, realizing that you have a streak of McGyver/DIY, Rocky Mountain Cartridge sells minimum orders of 20 brass shells ranging in .25" increases of length, 2" to 3" from $85 to $94. They have machined primer pockets for shotgun primers. They are precision made, one at a time, to .410 specs. Gil

I assumed the powders mentioned by KYjon were to be loaded with a shot load. They would be dangerous with a shot load, but probably not dangerous with a load of Cream of Wheat.

I'm afraid I also have a tetch of frugality in me, that makes me want to do "unnecessary things" on the cheap. If I go down this rabbit hole I'm going to want to go for having at least 100 cases to load. That's the reasoning behind me looking so hard at the Prvi brand ........... low price. I don't mind spending for the best brass (Lapua, IMO) for some of my rifles, but for a shotgun I figure cheap brass should do. My concern about other brands is that the rim thicknesses on all of them may not be the same, and one might work without thinning whereas another may not.

I have contacted PPU (Prvi USA) about sending me one case to try. They may not, but I figure it's worth a try.

Thanks, Gil.

Gil,
I believe the RMC cases will be the full thickness of a paper shell. I know that is the case for their 10 gauge brass, which I bought years ago. Undoubtedly, they can make them thinner, but I think that would be a custom job. Nicely, they will put whatever you want on the headstamp.

If Stan wants a single case, he can buy a Norma case from Buffalo Arms. There won't be much variation from on maker to another.