Hi Jim! - just got my (Ballard rifled) Marlin '95 SG today, haven't even unpacked it. My thurty-thurty Marlin 336 is Microgrooved, and I did havve leading trouble - but Paul B, fellow TFL'er, has posted a working solution - if he doesn't reply here you can find him using the 'search' feature... (which also works now - great, and thank you Zach and co !!)