I've tried the above method with different amounts of powder.
66g RL22 with a OAL 3.745, 3.695, 3.655
64g RL22 with the same OAL
The 66g/3.745 produced a pretty good group of .430 Other groups were unremarkable until the last group I shot.
168g Berger 66gRL22 lit with 215. OAL with hornady comparator 3.655