Originally Posted by savageshooter1997
...one whats br50 . . .
br50 = 50 yards Bench Rest
Far and away your biggest 'modification'
is going to be the ammunition you use. I've got a Mk II too and often put rounds through one hole at 50y BR with Mini Mags . At 100y, not so much. I've gotten 1.5" groups at 100y BR with Mini Mags, but not with any regularity. Most are over 2". My groups fall apart at around 70y.
They didn't have any sub sonic ammo at my local & chain shops, and even the Stingers go transsonic over 50y, so I going to mail order something.
I just put a Mueller 8-32x44 scope on it because the dime sized dots I shoot at were covered up by the previous scope's BDC dots. Side benefit, don't really need the spotting scope.
Here's a link to 22lr ammo results at 50, 75 & 100 yards. It shows what's possible with a high end rifle with just the brand of ammo as the variable.http://www.accurateshooter.com/guns-of-week/22lr-rimfire-ammo-comparison-test/
As far as modifications to the rifle itself, I'd go to a competition and talk to some people, perhaps the 'winners', and see what they found made the biggest differences.