Can anyone explain to me what Marlins' microgroove rifling is, how it differs from "normal" rifling, and why they are using it... I have two Marlin lever action rifles. My 1895 in .45-70 and my .30-30... I know for sure that the .30-30 is micro grove, but it was my understanding when I purchased the .45-70 that it was not micro grove... However, I am really not sure, and really don't know how to tell by looking, or how to find out. Now, one thing of interest. I have yet to find any bullet and powder combination that my .45-70 will not shoot well with. However, I can not hit an 8 1/2 x 11 target from 25 yards off hand with the .30-30... I have NEVER found any load that shoots worth two hoots in this gun yet... and am very disappointed with it.[/color] 