I just received some Peterson long brass and just tested a piece to see if it would chamber in both of my 300 win mags, my Browning xbolt would not close on this brass but my Sako 85 did easily. I will have to see how much the brass I have shot in the Sako has stretched when I have time.
I gained.0025-.003 from new Long to fire formed Long in my Weatherby. Accuracy has been fantastic and it is very consistent brass. Necks seem kinda soft but that probably helps keep neck tension consistent. This is a 3 shot group cooling the barrel down between shots. .308 was tared into the caliper to get CTC.