marlinguy wrote on Mar 28
th, 2021 at 4:15pm:
... But the typical Ballard in .32 Long is usually a much lighter barrel beyond the tulip, and thus would maybe somewhat thin at the dovetails.
I'm not sure I'd chamber any cast #2 in .38-40 myself, but I wouldn't say it can't done, and fired safely if you kept loads lighter.
Yes, this 32 had a fairly thin barrel, just as you describe, so I borrowed the shop owner's ruler. It did appear there was room to get a .401 groove under the sights, but I'd want to go back and take more careful measurements.
Since Marlin offered the cast actions in 44-40, I have to think the action is good for it. It was a discussion on breech thrust on the Leverguns.com forums that reinforced the idea. The late John Kort did a test which demonstrated the .44-40 case base doesn't press on the breech. The thrust delivered by the 38 and 44 WCF is from the primer. The thin walls of these cases readily grip the chamber walls enough (assuming you removed the oil) to hold the case base forward against the gas. Kort's test surprised me, but he'd once posted a photo of a sectioned 44 case. From that photo I was able to make some calculations on case cling and stretch which convinced me there indeed isn't much thrust.
The 44 RF probably stressed the action more than the 44 WCF, since it's floppy case construction exposes the breech to the chamber pressure over the entire case base, an area much larger. Ballards with cast breech blocks held the 44 XL and the 46, and both seem likely to have been operating at 44 WCF pressures.
At least this is what I'm trying to convince myself.