looked at T/c hunter has 1:9 twist,T/c icon 1:12 . basic same guns,same cal 7m08. why the big difference in twist, I was told 1:9 for 140gr and smaller, 1:12 for 140gr plus. But if U look, every brand is 140 gr , give or take there is no varaty of different gr of bullet. So all help and wisdom needed, confused but not lost.thanks to all.