I heard you can form 40-65 win. from 45-70 brass.Can anyone tell me what is involved?

I am not sure if they are the same length. I think you can just run the 45-70 brass through the 40-65 sizing die.

A friend of mine sizes 22 Savage Hi-Power cases from 30-30 brass but has to put them through a 25-35 die as a middle step. I think the squeeze from 45 to 40 cal will be OK. After they are sized down(and trimmed if needed) you just need to fire form and your all set.

You run the well-lubed .45-70 brass into a .40-65 die with a sturdy press. There's a couple of tricks. Seater dies like RCBS makes are basically oversized sizer dies and some like running the brass through the seater first. Then bring it to the final size with a second pass through the sizer die. Sliding seaters like Hornady makes don't work. I can't remember which is which, but Remington or Winchester is a bit smaller on the base than the other. You want the smaller brass for .40-65.

Starline makes .40-65 brass.
http://www.starlinebrass.com/

Bye
Jack

:D
I used to make 40-65s from 45-70 brass. All you have to do is run the case through the 40-65 full length sizing die. Make sure that you lube the case well enough for it to pass easily through the die. It helps if you run it halfway the first pass and complete on the second one. Be careful of too much oil, though. Excess lube can cause denting at the case neck.
All this is really unnecessary these days because Starline makes superior quality 40-65 cases with proper headstamp. Check out their website. Or, you can order them from Midway. The price is around $50. per 100 cases.


www.starlinebrass.com
www.midwayusa.com

You can form 40-65 cases by jamming lubed 45-70's in the full length 40-65 sizing die, but you will get much better results if you use an RCBS or C&H-4D case forming die set. After the case is formed, then size in the 40-65 sizing die and trim to 2.10 in. Starline make excellant but heavy brass that reduces powder capacity. In competition shooting that lost capacity could prove critical, but for general shooting and hunting it should not make much of a difference.

I say again, Starline makes this issue moot.

I say again, Starline makes this issue moot.

Not really. If powder capacity becomes important then one wants to use cases in the following order of capacity. W-W, R-P, Fed, Starline in max to min order. All except for Starline have to be formed from 45-70 brass.

I use a Redding 40-65 Form and Trim Die to resize 45-70s to 40-65s. It is made to chamber dimensions so it is an easier job than using a full length die to resize and doesn't unduely over work the brass. Lube sparingly and make a couple of passes. The brass will be too long after the initial resizing and need to be trimmed 0.010" longer than what you want your final length to be (as it will shorten upon the initial firing).

also some chambers are tight or real speck and 45/70 cases have bases that are tight for the chamber. After you size the case in the die put the shell on top of the ram or a smaller shell holder and size to the rim. Be sure you remove the primer knock out punch and use a rod to knock out the case from the die. Now they will seat in the chamber. This will only have to be done once. This does not have to be donr with starline brass.