Question to the Sumatra Gurus; are the Sumatra barrels choked both ends?
I have a 24 inch .20 barrel, when I push a pellet through the bore to check for marks, the pellet comes to a stop 12mm past the TP, then moves forward untill crown end choke.
I fitted this barrel to a M10 power plant, and accuracy was worse than with a shotgun at 50m. Used JSB 13.73gr, H&N 13.8gr, Beeman 15.89gr, Eun Jin 22.75gr. JSB did better than the rest, but still bad.
I cleaned up the TP and crown, started lapping the barrel.
Thanks for info