I have used the blitzking in the passed 55g in the 1 in 12 on an old cz with good effect its finding the right powder/propellant and working out the load I used RL7 .the 55g in my opinion is the max for the 1 in 12 twist ,now using an old bsa cf hornet so don't think I have the reloading data ,but did try some 45g with good results but that's some time ago
Tempest .22, BSA Lightning(delux) .22 ,HW 80 K .22 Sako finn fire .22rf, Browning Buckmark 22rf , BSA 22 Hornet centre fire ,Winchester s/a mod 1400 12 bore, Winchester select light 12 bore J Manton hammer side bee side 12 bore and a 410 hushpower, BASC MEMBER