I don't have a 40-82, but I too am considering it as a "do everything" caliber for Silhouette and long range. The following is from a post I copied to my hard drive from another forum:
There are two basic variations of essentially the same cartridge / case. Both are .45-2.4" cases tapered down to .40 caliber. Dave Crossno of Dibble, Oklahoma has a chamber (his design I think) that starts tapering in a straight taper from the case head to a short neck (about .4") and must be case formed with his proprietary FL die. Dave Higginbotham of Lone Star Rifles in Conroe, Texas also offers a slighltly different version. The Lone Star .40-82 is essentially a .40-65 profile with a .3" straight case head just above the rim. It is formed using standard .40-65 FL dies (I use the Redding-Saeco) stopping about .3" above the case holder. When I form brass, I first anneal Starline .45-90 cases and then size until they will just fit the chamber, by trial and error. I can't say just how far I stop above the shell holder but it is about .3".
The Lone Star version, by virture of having the straight portion at the case head instead of tapering up from the rim, should hold slightly more powder.