I am working a load with Superformance and 88gr ELDMs in my 1:8" 22-250.
With 36.9 gr and a F210M primer I get 2,933 fps and good accuracy, but the first 10 inches or so of the barrel are dirty with soot that looks like it had been sprayed and laid down in the barrel bottom by gravity.
It looked like it was loose, but would not move when shaking the barrel muzzle down. It cleaned very easily with a couple of patches with Bore Tech carbon remover.
I swapped to an RWS 5333 magnum primer and nothing changed: same speed, same accuracy, and same sooting in the barrel.
Would this powder, like Mule Deer has described with some sphericals, would need more pressure to burn cleanly?
What kind of speed would you consider a reasonable maximum with 88 ELDMs and Superfomance in the 22-250?
Thank you !
Alvaro
