Well, considering the size of the prey I’ll be after, mice, rats and the occasional squirrel, .177 seems to be sufficient. Also, my range varies from between 25 and 50 yards. With my Dream-Tac, set up with the 500mm barrel, there is no drop from 35 yards (zero range) and 50 yards. That flat trajectory makes it a lot easier for me because there is no holdover or under I need to worry about. That is if the Dynamic Compact can make the same power as my Dream-Tac. Plus, the mags hold more rounds, a tin holds more rounds and typically the gun will shoot more rounds between fills. This equates to less stuff to pack, less weight to pack and more time in the field shooting between reloads and refills. But, hey, that’s just my thinking, I could be totally off base!