45-70 necked down to .40?

Is there such a cartridge? Name? Is it a wildcat or did I just miss it along the way?

I ask since my Dad recently came across a lot of brass that had been necked down.

Seems like it could be a good idea.

Or it might just be a lot of brass that someone only got part of the way through making into something else.

Any info would be appreciated. My interested is peaked now.

Thanks,

.45-70 necked down a little is .40-65. Popular in BPCR because it is easier to get and neck down .45-70 than to find or make .40-70 Sharps.
A little more makes a .38-56.
Way more is .33 WCF, last cartridge for the 1886 Winchester.

Jim,
Thanks for the info. I found it now, 40-65 Winchester.

Not so much a hot wildcat but what looks to be a good, fun cartridge.

I was hoping for something crazy and hot. However, I think the 45-70 loading hot will do the job:D

Thanks,