I'm interested in having an intelligent discussion about mixing/blending powders.
If all you have to say about it is "Don't", please save it.
If you can qualify the "Don't do it" with rationale and reasoning, I'm all ears.
I know for a fact it is common practice for big cartridges, such as 460 Weatherby and 500 A-squared, to drop 5-10gr of a fast pistol powder in the case on top of the primer, followed by a heavy charge of slow rifle powder. Usually this is only for compressed charges, to keep the pistol powder by the primer, and not get mixed throughout. They call this a duplex load.
I'm more interested in the idea of blending two fairly alike powders together, so wind up with something in between.
Say you're loading for a cartridge that works well with Varget and H4350, but Varget is a bit too fast and H4350 is too slow. What would happen if you mixed the two 50/50? Speaking theoretically, so as to assume you had a homogeneous (NOT STRATIFIED) charge, would you in fact end up with a burn speed between the two?
Seems to me you would, though I'd expect it to be closer to the faster powder if mixed 50/50, because the slower powder would burn faster than normal on account of the faster powder present, and the higher pressure...?
Either way, I don't see how a 50/50 mix of Varget and H4350 would burn faster than just Varget alone. Thoughts?
It seems it would be safe to start at a charge weight known to be safe with the faster powder.
Bottom line: if Varget is safe to use, and H4350 is safe, how could the two mixed not be safe?
I know I've read posts from chemical engineers here on the hide commenting on burn chemistry...hopefully one will chime in and educate me.