IMR's website provides the following load data for 270 Win. with a 140 gr. SFT SP:
Case: Winchester
Primer: WLR
OAL: 3.280"
Starting load: 49.9 gr = 2,775 fps
Max load: 53.7 gr = 2,977 fps
I loaded up some cartridges with new Norma brass, and WLR primers, and 140 BT's. I used a bullet jump of 0.050". I was hoping to get to 2,900 fps.
My results were:
52.5 gr. = 2721 fps
53.0 gr. = 2737 fps
53.5 gr. = 2777 fps
54.0 gr. = 2795 fps
54.5 gr. = 2807 fps
No pressure signs.
Three of the five shots grouped at 1/4". Four of the five shots grouped at 5/8". The fifth shot was wide, resulting a five shot group of 1.2".
With my large overflow case capacity, the velocities are significantly lower than the published data. However, the accuracy looks very promising.
Anyone have a suggestion on what to do with the velocity? More powder? Magnum primer? Go back to IMR 4831?
Dan
Case: Winchester
Primer: WLR
OAL: 3.280"
Starting load: 49.9 gr = 2,775 fps
Max load: 53.7 gr = 2,977 fps
I loaded up some cartridges with new Norma brass, and WLR primers, and 140 BT's. I used a bullet jump of 0.050". I was hoping to get to 2,900 fps.
My results were:
52.5 gr. = 2721 fps
53.0 gr. = 2737 fps
53.5 gr. = 2777 fps
54.0 gr. = 2795 fps
54.5 gr. = 2807 fps
No pressure signs.
Three of the five shots grouped at 1/4". Four of the five shots grouped at 5/8". The fifth shot was wide, resulting a five shot group of 1.2".
With my large overflow case capacity, the velocities are significantly lower than the published data. However, the accuracy looks very promising.
Anyone have a suggestion on what to do with the velocity? More powder? Magnum primer? Go back to IMR 4831?
Dan