Marty, when using H4895,start around 26.2gr. and slowly work up to around 28.2gr. Might want to also try some 8208. Start around 26.2gr. with that powder also.
Never tried Rel 10 in my 204 but shoot it in my 20 Tactical. I would suggest starting around 22.5gr. with that. My load is 24.6gr. but that is a very warm load.
Make sure you play with the seating depth.Will make a world of difference in group size.
Good luck!!