So Tiger Sr. is only about 14 oz heavier than Jr..? Not bad..!. I plan to use a 55 AX on Tiger Jr, which at 5000 ft above sea level should be a good match but by no means overpowered. I know a .46 would probably be marginal on Tiger Jr at this altitude and a .60 would probably be marginal for Tiger Sr; but I prefer to have a few more horses than not enough. Would love to know if you are successful with a .46 on Tiger Sr if you do give that a try!