I just got my marlin 22 mag and put it through the ropes with various ammo(horn 30 grain, cci 30 grain +v, cci 40 grain hp, win 34 grain, federal 50 grain and win 40 grain x hp). Best shooting is really a tie. The 50 grain federal and 40 win x were under 1 inch at 100 yards. The rest were all over 2 1/2 at 100. That said I just bought 500 of the 40 as midway had them in stock for all of about 5 minutes. I went with them over the 50 grain because I actually thought the 50 grain would have issues with expanding. As far as energy the 50 grain really had no advantage over the 40 until after say 90 yards. I just picked up 250 rounds of the dynopoints from a friend who said they wont shoot in his gun $25 bucks couldn't say no. I haven't shot them in my marlin but hope they shoot as well as yours does. they are usually the cheapest you can find and the are lead with a brass coating so I bet that is why they perform well as they probably expand very well. Its weird as they are the only bullet listed on the Winchester sight that says for use with larger game.
I would stick with them and just figure out your trajectory. I went with the 40 also in case a coyote comes in instead of a grey and needed a jacketed bullet with a bit more energy. but who knows I haven't shot either with one yet. good luck.