UPDATE! well i have had some time and have been shooting my new 280ai and have had some questions. I have loaded retumbo, h4831sc and hybrid 100v. I thought i was going to get more velocity out of the h4831sc and the retumbo but not as much as i wanted. the real suprise was the hybrid 100v. I have a sako 75 LH in a Mcmillan sako 75 stock with a 25" benchmark 3 groove 1:9 twist. Im using new nosler brass, cci BR primers, and 168gr berger hunting vld's. so here are the max loads i tested and what i found:
Retumbo:
started at 61gr
63gr 2800fps
64gr 2840 slightly flattened primers but bearly noticable
H4831sc
started at 54gr
59gr 2768 fps no pressure (this is a max load for 160gr accubonds in the nosler data and they say this gets 2990fps)
60gr 2790 fps bearly see any flattening at all of the primer
61 gr 2835 fps little flatter but nothing alarming
With both of these powders i thought i would be getting 50-100fps more? i have a 25" #5 contour so its not a barrel lenght issue, so what gives?
then i just tried some hybrid 100v since its loaded in the 280 rem and the pressures were low with good velocity so i thought i would strart low and see what happened.
Hybrid 100v
started at 51 gr sinve thats the max load for the 280 rem and the pressure as stated was low.
worked up in 0.5gr increments and didnt see any pressure
57gr 2966 fps
57.5gr 2972 fps
58gr 3014 fps (primers started to show slight signs of pressure, nothing alarming)
58.5gr 3042 fps flatter primers
59gr 3064 fps hot load flat primers this is too much for me to want to load.
I wanted to use an extreme powder for the temp sensitive but i just am not getting the velocity with them as i am with the hybrid 100v. Am i doing something wrong here? any tips or suggestions would be good. I know i could use a magnum primer but i have 3k benchrest primers so i really dont want to buy any more.