.380 w/ W231 & Hornady 115 gr HP
I set up my used Dillon SD for .380 auto rounds using W 231, a 115 gr Hornady HP, Starline brass & a Winchester primer. I monkeyed with the OAL, since my manual said to keep it shorter than maximum with HP bullets, but the cases bulged a bit. I ended up going up around the maximum cartridge length which minimized the bulge. I tried a few in a magazine in the garage and they chambered properly when the slide was released. I took the first hundred to the range and despite the varied lengths, I only had one stoppage. That one hung up on the ramp, but promptly chambered with one more slide pull & release. They all went bang. My Beretta 85FS seems to be fairly straight from magazine to chamber, so it may be more forgiving than another gun.