Alpha Munitions 6mm ARC Brass

[BD1]

BD1: Seems your experience was considerably different than, my experience or perception. My approach was to ID & OD chamfer the case mouth, 000 steel wool the case mouth to remove fine bur left by chamfer tool. Primer pockets were left un touched. Seated CCI 450 primers  W RCBS hand seating tool.  Primer seating was smooth though very snug. The pockets were very uniform, I do not think the cases I am working with would see any benefit from a uniform process.

Initially was just looking to fire form the cases & decided to burn up some 58 gr V - Max bullets over H4198. I was rather pleased to achieve some amazing 100 yard accuracy while fire forming w 26.3 gr of H4198. For what ever reason this load seemed to shoot best from a warm barrel for me. So was not consistent from cold to warm barrel. So while Accuracy was not my goal, my best group was a ragged hole.

I am on my second reloading w 50 of the 100 cased. The remaining 50 I have only prepped the case mouth. After the 2nd firing, I'll plan to anneal the neck shoulder junction area. Thin off to working up a load w a 90 gr CX for deer hunting.

The difference in the primer seating may be in the primers. I'm using Remington 7 1/2s. I have a difficult time getting them to start into the pocket before I chamfered hte edge of the pocket. All of my pockets mic'd a little less than what the PPC reamer produces. leaving the majority seated just a hair below the case head, with a few of them just flush.