The author of that article was the one and only Paco Kelly.The whole concept of putting the .44-40 into the .444 Marlin is irresponsible, reckless, and just stupid. The author is an idiot who should know better and whoever allowed that article on their website leverguns.com is an even bigger idiot.
Wait...You put cartridges in a firearm based on what is stamped on the barrel of that firearm. Don't do it. Don't even think about doing it. And to post the ballistics! Come to think of it, we are beyond moron and idiot and irresponsible with this one.
I provided contact information above.The bottom line is that portions of this article and the information in it were inappropriate and that should have been recognized by both the author and editor.
As a rule, I wouldn't shoot .40 S&W out of a 10mm firearm. The majority of handguns that are auto loaders, headspace on the case mouth of the cartridge. Now, since the .40 is shorter than the 10mm, this will cause excessive headspace, and subsequent failures, and catastrophies if shot.Late to this show, but can't resist noting that nobody (nice list, FM!) has mentioned the .40S&W in 10mm... I'll go to sleep now.