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Yeah, data from other 7mm cartridges may work well, my 308 and 30-30 both use the same load of Trailboss despite quite different case capacities.

I can't help with 7mm, but the load will vary a huge amount depending on the projectile, so you need help from someone using the same one.

In my 308, the 151gr cast bullet uses 8gr of Trailboss,...