called 5 different local gun stores today looking for a pound of 8208 XBR, fifth one had it but a that would mean a 50 mile round trip so I ordered a 8 pound jug from Grafs instead, 2 gallons of gas and two hours of frustration is worth $22 for shipping and Hazmat. I tried to buy local but it is what it is.
I hope like heck this gun likes 8208 but it seems to be the powder of choice for the 123 Sierra, and Hornady bullet and Nosler rated it as the most accurate powder for their 123's so I think I am on safe territory. I called the manufacturer today and asked what they recommended and he said he uses 8208 in his loads with the 120 and 123 bullets
The upper and the cases arrived today and this weekend I will stuff the 35 leftover 107 SMKs with a mild load of TAC or RL10x for the barrel break in and try and another 15 with 123's and Varget just to round it up to 50. I also ordered another Wilson trimmer. No used ones on Ebay so I came off the credit card for a new one. I set one up permanently for each cartridge I am loading. I trim after every firing for consistency
I have not did any accuracy load development on a gas gun in years, I think this make a fun summer project
edit @ Chaparral I am going to modify those barrel break loads to the CFE223 and a 123 bullet. I have about a half pound on the shelf, thanks for reminding me