Like you, I've used a good deal of Elephant when GOEX wasn't available - and, of course, stocked-up because the supply of black has been uncertain more than once (I still have some Curtis&Harvey and some less common BPs from those bad old days).
And I never had any reason to complain about its performance, though I just shot it and never bothered to chronograph it until recently, when it became obvious that it is NOT the same as GOEX.
Which is not to say that it is no good, or useless - just that GOEX seems to be the better, more efficient powder. I'll eventually shoot it up or trade it off: I sure won't pour it on the cactus and ocotillo.
What I really wish is that there were more choices in modern BP, or that I could find a few kegs of (just to name a few) the old C&H, Pigou, Laflin&Rand, Hazard's or (too good to hope for) Col. Rains' Confederate Powder Works product, which even the damyankees conceded was a superior powder.
I acknowledge the Swiss as excellent powder, but still wish we had some other choices as good, or, better still, American-made and, one hopes, less expensive.
mhb - Mike