That sounds more like a 30-30 functionally.  Did you check its loads?

I have been shooting my Brg BPCR /Hart 8 twist barrel/
32-40 Rem Hep for some years. ( yes, actually a 30 cal nom 300/308 bore and groove.)
My main load which I have shot in gong and in Schuetzen
matches is :  15.5 gr IMR 4227 under the Lyman 311299
bullet w/o gas check , but with a floral foam wad up against the base of the bullet. Should shoot well in your 10 twist barrel.
BTW, I have the original Dan T tight neck 32-40 RH reamer.
And yes, you can pretty much use 30-30 WCF data.
The case capacity is very close between the 30-30 and the 32-40 RH
beltfed/arnie

Schuetzenmiester wrote on Apr 22^nd, 2020 at 2:32am:


Technically it's called a ".32-40 Remington" not the same cartridge as the .32-40 Ballard we commonly know. Remington made their version with the smaller .31 caliber bullet, but I'm guessing they didn't want to call it a .31-40 and make people think it wasn't as big as the competition.

Marlinguy,
The funny part of this "name game" is that the 
32-40 Remington was introduced in 1871/72 in their
No 1 roller that had been introduced in 1870 and then later in the No 3-Rem Hep. and Yes, it is what we might call actually a true 30 cal. COW lists it as 0.309" bullet and bore diameter would have been/is nominally 0.300.
I have to wonder what was so different to call it a 32 cal rather than a 30 ( European habit to refer to bore rather than groove diameter?)
It is noted that there were several of the earliest cartridges in the 1860s - rimfires that were "32 cal" in pistols. they were 0.316" diameter bullets, so I suppost that was a logical roundup to 32

The 32-40 Ballard was not introduced until 1884 and it is indeed a true 32 cal . Bullets at 0.320. Marlin picked up the ctg along with the Ballard rifles. then Winchester started chambering rifles in it in 1886. And later "stole" it, calling it the 32-40 WCF,etc
Actually there were/are many "32 cal" ctges that are NOT:
32-30 Rem, 32-35 Stevens of 1880 were 0.312",
Later 32-20 WCF is also 0.312 (1882). 
As said, they seemed to "round up" the number to 32.

There is also a true 30 cal , and also named accordingly:
the 30-30 Wesson, 0.308"
beltfed/arnie

JHM, click on your handle and look below and there is a link to your last 5 posts. Bring up the one you want and reply and it will pop back up.