Author Topic: Trapdoor neckup? (Read 345 times)

Questor · « **on:** June 16, 2004, 12:05:27 PM »

Has anyone experimented with necked up cartridges like, necking up a 45-70 to 58-70? It might work in a trapdoor rifle. What the heck! Every other kind of hairbrained idea has been tried, why not this one.

John Traveler · « **Reply #1 on:** June 16, 2004, 12:23:54 PM »

It's not possible to neck-up the .45-70 case to .58 caliber because it measures only 0.508 maximum diameter at the base.

For the same reason, it's not possible to neck it up to .50 caliber either.

Questor · « **Reply #2 on:** June 16, 2004, 01:14:09 PM »

No, I mean actually necking it up so the case mouth is bigger than the base, then dropping the cartridge into some kind of a trapdoor mechanism that holds necked up cartridges. I'm not talking conventional reloading here, I'm talking about designing a gun around an offbeat cartridge.

New Hampshire · « **Reply #3 on:** June 16, 2004, 01:17:42 PM »

It would be impossible. Like was said, it would be bigger than the base. With no neck or no belt or no rim to headspace on I doubt you could even get consisrent ignition. The ONLY way would be to get a case with a monsterously huge rim on it. There has to be SOME form of headspacing.
Brian M.