Did you ever find a powder that goes through a powder measure that gets you up to 3400fps in your .243.
Seen any varmints lately?
No, sadly I have'nt had much opportunity to mess with my .243.
I'm still using 47Gr of H414 to push a Hornady 87Gr Vmax out to 3250-3300.
I've put 10 rounds into a 3/8 inch circle at 100 yards with this load, so I'll stick with it for now.