Free: Contests & Raffles.
Your IMR 4350 is perfect for the 30/06. I'd use it for 150 to 180 grain bullets. The 4831 is slower burning and works well in a lot of cartridges but it's not ideal in the 30/06. I've always used H4350 for my 30/06 loads but it has not been available in stores for quite a while now, so I just bought some Ramshot Big Game to try. Another good powder to try especially if it's just for target shooting would be 4895. You could also try the new IMR 4451, which is supposed to be really similar to H4350, except that it has some additive that reduces copper fouling in your barrel.