Newtire
04-25-2010, 09:57 AM
OK, so here are the figures on my testing of this immensely popular round this weekend.
The Lyman 257420 74 grain (that's what mine weigh with a gas check and lube) gave out 1627-1646 fps reading with 5.0 grains of Unique and a small rifle primer.
Using the 80 grain RCBS cowboy boolit modified as per Beagle's article with a gas check added and weighing in at 88 grains, I got 1687-1732 fps using 10 grains of SR 4759.
Both of these loads gave 1/2" group size at 50 yds. An increase to 11.0 gr. of the SR 4759 opened up the groups to over 2". I am going to try a pinch more of Unique and see what happens but these were some pretty impressive figures and great accuracy.
Trouble with that caliber seems to be just a little too powerful for little stuff and not enough for anything big. Sure is fun though. I used up all my Lyman 257420 boolits and had over 600 cast up! How did that happen?
I'll have to set aside some time to cast up a bunch more I guess. Darn!
The Lyman 257420 74 grain (that's what mine weigh with a gas check and lube) gave out 1627-1646 fps reading with 5.0 grains of Unique and a small rifle primer.
Using the 80 grain RCBS cowboy boolit modified as per Beagle's article with a gas check added and weighing in at 88 grains, I got 1687-1732 fps using 10 grains of SR 4759.
Both of these loads gave 1/2" group size at 50 yds. An increase to 11.0 gr. of the SR 4759 opened up the groups to over 2". I am going to try a pinch more of Unique and see what happens but these were some pretty impressive figures and great accuracy.
Trouble with that caliber seems to be just a little too powerful for little stuff and not enough for anything big. Sure is fun though. I used up all my Lyman 257420 boolits and had over 600 cast up! How did that happen?
I'll have to set aside some time to cast up a bunch more I guess. Darn!