Well I went to the range again yesterday to sight in my other rifle (Ruger M-77 MKII 30-06) and my Ruger Bisley .44 AND to recheck the Marlin .35 using a bigger bullseye target. I am happy to say the 336C shoots true and it holds a two inch group at 100 yards and I am very happy.
What really makes me VERY happy my results with my Ruger M77. Using Winchester 165 grain Super-X ammo, I got it sighted in at 3" high at 100 yards... CLOVER LEAF, perectly centered vertically!!! At 200 yards it drops into the bull X-ring and the next ring all within a two inch group! I almost sh-----my pants. Unbelievable. I think the advice I heard from old timers rings true. LET THE BARREL COOL. I did (5 minutes in between shots). The scope is a Luepold Vari-x II.
I would also like to mention I finally got a bottle of Hoppes #9 bench rest solvent. The ammount of copper removed compared to the various other stuff I have been fooling with, is beyond compare. It removed copper from my gun barrels after I cleaned with the others. I am talking real green. I HIGHLY recommend it!
Oh, the Bisley was clanging iron at 25 yards without hesitation. A loud clang!