H-110, IMR4198, IMR4895...
you can substitute h-110 for 296....
Instead of 4198, you can use either 3031 or RL-7...
And 30-06...man...you can use quite a bit of diffrent powders....mebbe Winchester 760/H414, IMR4064, 3031...
The question you need to ask is what you want to do with the rifles?
Plinking? Find some surplus pull down and recreate the actual mil-spec loads that were used in them...
D