Never tried Magnum. Heard it was a good one. I used 22, 25, Retumbo, 7828, and H1000. RL25 just won out for me cause of accuracy, but I would imagine Magnum would work as good as any of the others.
. (Handloader Issue 233)
Be Alert: Publisher cannot be responsible for errors in published load data.
Wt. Bullet Powder Manufacturer Powder Charge Velocity (FPS)
140 Speer Ramshot Magnum 69.0 3,240
Remarks: accuracy (inches): .88
This was a load work up in a Win model 70 with 26" barrel.
I used this powder in a 24' barrel M70. I worked up to 70 gr. and got 3050 fps but this rifle has a slow barrel and will digest more powder without showing any pressure signs.
I did get around 1" groups with 68 gr. but fps was 2950.