Using the new Winchester 243 super short whatever, has anyone out there necked this up to 25 with a sharp shoulder?
Thankx
Dick

Dick-Mike at On Target Technologies,LLC has a whole series of cartdridges based on the 22 and 6mm Super Short cartdridges.
Albert

Ah, but there's the rub. The OTTR's don't have a sharp shoulder. They have a curved transition from shoulder to neck that is similar to the P.M.V.F. (C.C.C.) cartridges that were so popular from about 1936 to the 1950's. The major difference with the OTTR's is that they are based on the modern cartridge cases, such as the WSSM's, BR's, etc. rather than the old workhorses of yesteryear. Mike has reported some truly excellent velocities and extremely tight groups from the Thompson barrels that he chambers.
Regards,
HockeyPuck