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Canister Grade SMP 768?

You will not find factory powder that is equivalent to a canister powder--it may be close, but not equivalent. One is made so that every # is as identical as possible. The other is made in huge volume to a much looser spec. and the factory tailors each lot to each cartridge.
The powder manufacturer may tell you what powder is most like, but remember it is not equivalent.
 
Yes, very well aware of that.

Am interested in it's, shall we say, "Off-Spring". Given certain companies refusal to post any nominal info about powders, and some that do; I don't generally fall in line with the "Canister is tighter tollerances", but do agree with the basic premise.

SMP-842 is where we get CFE223. SMP-768 is used in the M118LR Mk316 Mod 0 ammo.