Powders for WSM and SAUM

[texas]

Knowing that some you have been shooting these what powders are you using. Read some far back post for 30 and 338 cals, mentioning 4064, tac-125, vv560 and various others what works the best or close to it?
Also how does the BC change as the bullet speeds up

. I thought that it stayed the same as before it was fired.

 

[BountyHunter]

I shoot the 300 WSM in 1000 yd heavy gun. Only tried one powder H4350 after talking with a couple others that are shooting it. Both of us have guns working very well with H4350. I am sure others will work, but not much better, if at all than what I have got now. Add H4350 to the lot to test. Use the ladder method (See explanation in ballistics forum) for each powder and find what your gun WANTS to shoot well that way is faster and cheaper than 4 powders and 10-15 5 shot groups with each.