Hello Whats the best regulator pressure and the best power wheel with 500M barrel the standard one with aluminium bottle 400c for h&n slugs 21 grains and javelin 21 grain slugs? Tell me seperately like this for example, h&n 155 reg pressure, javelin 165, i want the best slug regulator and accurate at 50 to 100 and above for these 2 types of slugs i listed, And thank you if you could help