Just picked up the 444SS marlin, the serial # is 0302XXXX which I assume is a 2003 model. The Marlin site has the gun supplied with the 1 in 20 twist and deep Ballard style rifling, my gun has Micro Groove stamped into the barrel. My concern is in the ability to shoot the heavier bullets well. I currently have the Hornady light Mags in 265 gr. Will these fit the bill on the micro barrel? I love my 336CS in 35 Rem with the Micro Groove. Thanks for the input