Chances are the barrel will be too tight for the smooth Harvester sabot. Perhaps you could try the crush rib sabot, that is what fits my Omega. In my Omega, i use W209 primer to ignite BH powder. Loading 90g works for me, as does 110g and mostly anything in between. If you never get chances to shoot over 100 yard, 90g powder is plenty, if it is accurate in your rifle.