I've tried Varget and H335 for my TC Encore .223 using 52gr bullets. I've had better accuracy results using Varget. However, Varget doesn't meter well for me using the RCBS Uniflow. H335 meters great for me. My recommendation would be to pick up a lb of each and see which one works best for your gun. There was a recent poll for the best .223 powder and these 2 were voted the best. If you're lucky, H335 will provide the most accurate load and you'll be able to use your thrower. I just picked up a set of Lee dippers and hopefully one of those will consistently get me within a few grains of my pet load using varget so I can top it off with a trickler by hand.
Good Luck!