Been using 24gn of H335 with 55gn bullets in my CZ527 Exclusive Ebony 1:9 barrel to good effect. Just last week I decided to try 69gn bullets through it. Several sample batches have been made up but not tried them yet.
HuMa regulated S200 .22...
Artemis PP800 .177...
Weihrauch HW45 .177
52 grain AMax over 20.5 grain N120. Very accurate load