I have been handloading for years, and just ran into the first time I ever experienced over pressure loads using accepted data? I am loading for tc 14 " 6.5mm tcu. I started out by using 223 ammo and form firing them to my super 14 contender in 6.5mm tcu, neck resizing and then loading with 20 grains vargat behind
Hornady GMX http://www.hornady.com/store/6.5mm-.264-120-gr-GMX/
I instantly had flattened if not ruptured primers and hard case extraction, even though max load was listed as 25 grains. I dropped to 15 grains and still had the same signs but not as bad. Not till I dropped to 10 grains did it seem better?
I tried seating the bullet deep or sticking it way out and no difference, is it maybe because this is an all copper alloy slug and the twist is too fast (1 in 10)
They chambered up ok so don't think it's a neck reaming issue?-
I really wanted to try reloader 7 or 2400 but could not find any data for those powders- any experienced pointers appreciated (no armchair aficionados please)
Hornady GMX http://www.hornady.com/store/6.5mm-.264-120-gr-GMX/
I instantly had flattened if not ruptured primers and hard case extraction, even though max load was listed as 25 grains. I dropped to 15 grains and still had the same signs but not as bad. Not till I dropped to 10 grains did it seem better?
I tried seating the bullet deep or sticking it way out and no difference, is it maybe because this is an all copper alloy slug and the twist is too fast (1 in 10)
They chambered up ok so don't think it's a neck reaming issue?-
I really wanted to try reloader 7 or 2400 but could not find any data for those powders- any experienced pointers appreciated (no armchair aficionados please)