Over the course of time, I have takin' a liking to the 140 gr. in 357. With 2400 (the only magnum powder I have used) being in short supply. I have begun picking up a pound here and there of 300MP.
My only data source is from Alliant. They don't list the powder for 140 gr. And the 125 & 158 gr. data is two different bullet types.
In 300-MP:
125 gr. GDHP max is 22.3c @ 1450 fps.
158 gr. UCSP max is 18.6 @ 1690 fps.
So my thinking is setting the max for the 140 gr. LCN load at the max of 19 gr. And for 140 gr. XTP at 20 gr.
The crimp groove for the lead (Hi-Tek II coated) sets the COAL at about 1.590".
I'm starting at 17 gr.
My only barrels are 2 1/4 & 4".
Does anybody see any problem with my thinking?
Thanks!
Kevin
My only data source is from Alliant. They don't list the powder for 140 gr. And the 125 & 158 gr. data is two different bullet types.
In 300-MP:
125 gr. GDHP max is 22.3c @ 1450 fps.
158 gr. UCSP max is 18.6 @ 1690 fps.
So my thinking is setting the max for the 140 gr. LCN load at the max of 19 gr. And for 140 gr. XTP at 20 gr.
The crimp groove for the lead (Hi-Tek II coated) sets the COAL at about 1.590".
I'm starting at 17 gr.
My only barrels are 2 1/4 & 4".
Does anybody see any problem with my thinking?
Thanks!
Kevin