Currently I have 3 .204 Rugers on a Contender platform....all carbines and all 23". I have had great luck with several combinations of powders and 32 gr. bullets from both Sierra and Hornady. Right now my new favorite powder is RL-10x but I have also used RL15, WW748, H322. I shoot a ton of prairie dogs with mine so I get to stretch them out quite aways.