I hate to post a link to another forum but there is a guy who's handle is 35remington on Marlin owners who seems to have mastered almost all the 35 rem load and loves the gas checked lead loads.
http://www.marlinowners.com/forums/i...c,37647.0.html
I think the Microgroove barrels get a bad rap from the CASS shooters but in reality they do a very good job just like the ballard rifling. I shoot rem core loks in both 150 and 180 grain in my 35 rem marlin and it loves them so well i won't be going to cast bullets any time soon.
I was really suprised at the little 150 core loks in the 336 rc. I had them for a contender pistol barrel and they shot into 2 to 3 inches at 100 yards in the marlin. I have been using them on groundhogs and they really mess up a hog at 100. They do shoot much higher than the 180's in my gun about 4 inches at 100.