Probably a dumb question, but. The latest information I have been able to find about th Marlin 1894 FG is that it has "button rifling", the original information was that it had "microgroove rifling". What if any is the differance?

That description doesn't help settle the issue. 'Button' rifling merely describes the manufacturing process, where a hardened button with a reverse imprint of the rifling is pulled through the barrel. The button could have any type of rifling, within reason.

Rifling can also be formed by cutting, broaching, hammer-forging, or even EDM (electrical discharge machining), and there's no doubt even other ways to do it.

"Microgroove" is a style of rifling with many small lands and grooves; normally in the range of 12-20 or so. Conventional rifling or what Marlin calls 'Ballard' is usually in the range of 4 to 8 lands/grooves, sometimes as few as 2.

Bottom line, rifling is what the manufacturer calls it, names are just conventions, not standards.

That's the way I understood it, but the way the info was listed was almost like it was a different type of rifling. I know that Marlin was using the microgroove rifling on these guns and just wondered if they had changed something. The next question would be; Has anyone had any problems with accuracy in this rifle because of the microgroove rifling?

Yes. See my post and query in this forum. My rifle works great with jacketed bullets, but keyholes cast. Maybe its alloy, maybe it's rifling, maybe it's bullet diameter. Whatever it is, it's driving me nuts.

Marshall Stanton (owner of this site and Beartooth Bullets) has some excellent posts here on how to get the best accuracy (with excellent results) from Micro-groove rifled Marlin rifles with cast bullets.

Do a search for Micro-Groove or search through some of Marshall's previous posts.

OK, I guess I find out soon enough. My rifle just arrived. Well sort of, it is at the dealers, but I have to wait until he gets back on the 29th to go get it, so I will just start working on some loads. Will be interesting to know how any loads I work on will shoot in each of the three guns I now have in 41 Mag.

Yes. See my post and query in this forum. My rifle works great with jacketed bullets, but keyholes cast. Maybe its alloy, maybe it's rifling, maybe it's bullet diameter. Whatever it is, it's driving me nuts.
Mike, have you tried shooting some .432" diameter hard-cast gas-checked bullets like I suggested last month? http://shootersforum.com/showthread.htm?p=100505#post100505

I think your problmes might just go away. If they don't then slug the bore and check for constrictions where the sights are dovetailed into the barrel. It's not uncommon with these guns to find up to .003" constriction at the dovetails. Firelapping relieves the constrictions and accuracy with most any well-fitted bullet is almost fool-proof!

Keep us posted on your progress!

God bless,