Problem is -- the powder charge depends very much on the strength of the spring. I´ve just changed the spring on my 06 and have had to increase the charge accordingly, as it didn´t fully recycle.
The following Bullseye loads work OK for me (but might not be optimal for anyone else):-
P 08: 4.0 grains
LP 08: 3.5 grains
Navy: previously 3.7 gtrains - now: 4.0 grains
use with caution.