Looks like decimal points are shifting around...Part of my group measured 1.3 inches and not .13 inches. The flyers were 8 inches and 14 inches low.
Earlier I made a cast of the chamber and about an inch into the rifling. The chamber, leade and throat look fine. It looks like a sharp transition from the end of the chamber to the rifling, typical of what I have read about Browning BPCR chambering. Cases were stretched and trimmed .005" short. Mouthe's of cases were chamfered, powder and wads inserted then loaded cases were then run through a Meachum neck die .125" to have very light neck tension.Paper patched bullets, (OfficeDepot Translucent Tracing Paper #25 pound. wrapped to .450 dia. it is a nice smooth press fit into the chamber.) inserted with no paper cutting or bunching. The bore looks good and there is no lead in the bore.
Today I loaded one round and the only thing changed was the wad and powder charge. The wad stack consisted of one Walters wad .063" thick and a news print wad over that. Powder charge adjusted for .125" bullet seating depth. The charge was 76.5gns Swiss 1.5. Prior to shooting this load into the pool the bore was cleaned of oil and two tight patches after that. the patches were clean and the bore was dry. I fired into the pool and the recovered bullet looked like the previous ones....I'm somewhat at a loss here! I wonder if the patch material may not be tough enough. I could not find the wad.
Thanks guys...Richard