Loading the 300 Blackout on a Dillon XL650 progressive reloader (with auto case feeder), using Accurate Arms #9 pistol powder. BRASS: Lake City .223 brass, trimmed using a Dillon carbide 1200 electric trimmer. Trimmed to length using a Wilson Combat GO / NO-GO gauge. Case mouth chamfered using an RCBS Trim Mate Case Prep tool (sadly, the small primer pocket cutter did not even begin to remove the Lake City primer crimp, have to call RCBS and ask how this low lever of quality control could get by the inspectors, had to fall back to a carbide, hand cutter). RELOADING DIES: RCBS, 300 blackout dies CRIMP DIE: Lee Factory Crimp Die (set to factory directions) about 1/32inch of crimp SHELL PLATE: Dillon .223 shell plate PRIMERS: Wolf, small rifle primers. POWDER: Accurate Arms #9. Test loads, ten each from 14.0 grains to 15.0 grains, in two grain increments. BULLET: Wiedners, MBM2B .308, 150 gr M2 Projectiles, seated to an over all length of 2.258 (2.26 was too long to reliably work in a USGI aluminum mag with a MAGPUL no tilt follower. The Dillon XL650 has some issues with the 300 BLK brass. I started using a standard XL650 conversion kit for .223. The shellplate worked great. The white insert for the brass system seemed to cause misfeeds because of the window to accommodate the longer .223 brass, I'll have to measure and cross reference one without the window, perhaps 9MM or .40 Cal??? The Small Rifle Brass Shell Plate for the auto brass feed system did not reliably feed 300 BLK brass into the tube, base first. Neither did the LARGE PISTOL, nor SMALL PISTOL plates. I had to fall back on manual brass feed, which is not what you want out of your XL650. Off to the range for test firing. I will post pictures of the primers for each powder charge, looking for signs of excessive pressure, etc... More tomorrow.