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Marlin 336 micro groove system

Discussion in 'Rifle Country' started by seb1, May 30, 2007.

  1. seb1

    seb1 Active Member

    I saw a marlin 336 ss on the marlin web site and i felt in love with it, but what is the micro groove rifling system?? is it good?? someone told me that it can be fill with lead very quickly? and not good for cast bullet is it true ??

    thank for your help

    seb ( a possibly new 336 ss owner )
  2. SSN Vet

    SSN Vet Well-Known Member

    in short....more grooves, cut shallower

    there's a really good article hear in rifle country, somewhere in the 336 club thread about the developement of micro-grove rifling with speicific mention about shooting cast bullets....try using the search command.

    summary (as best as my memory serves) you can get great performance without leading the barrel, but you have to learn to do it correctly (use slightly larger dia. bullets, etc...)

    I have a 336CS and it is both a beauty and a shooter (~1.5 MOA and maybe better).

    I don't shoot lead, nor cast (yet), so I didn't mezmorize the content.
  3. 4fingermick

    4fingermick Well-Known Member

    They tend to prefer oversize lead bullets, but apparently do fine with jacketed (I can't comment on this, I only shoot lead through my lever guns).

    If you don't shoot lead, it's a no-brainer, if you do, you will get good results, but you might have to fiddle around for awhile to get them.

    There is a good three part article on cast in the 444 on Buffalo Bullets site. The same principles apply for the smaller bores.

    What calibre Marlin are you looking at?
  4. _N4Z_

    _N4Z_ Well-Known Member

    I have a 336 in 30-30. At first I did not like the micro rifling. It initially seemed to foul up quicker (copper fouling, i only shoot factory jacketed), and accuracy suffered.

    But once it got broke in a bit and I started cleaning with copper in mind, everything came into line. I really like this rifle now and it makes frequent trips to the range. Even with the not so great stock sites it will shoot in the 2 to 3 moa range, when I'm on my game. For sure a keeper. Just wish 30-30 hadn't decided to get pricier. :cool:
  5. GRIZ22

    GRIZ22 Well-Known Member

    I shoot a lead bullet load (.309) that gives about 1250 fps through my 336 w/ micro groove. Accurcay tends to drop off after about 50 rounds, I clean the barrel and it's accurate again. I know other people with Marlins who have tried my load and it didn't work at all no matter how well the barrel was cleaned.

    Accuracy with lead bullets with micro groove seems to be a sometimes proposition to my experience.
  6. seb1

    seb1 Active Member

    im looking at a 30-30 caliber for a 336ss.
  7. JohnKSa

    JohnKSa Well-Known Member

    The key is that the bullet needs to be a thousandth over the ACTUAL bore size. From what I've seen, people who seem to get consistently good results with lead bullets and microgroove rifling almost always slug the bore.
  8. ftierson

    ftierson Member.

    Generally, it's better to use jacketed bullets in microgrooved barrels...

    Sometimes you can get a rifle to shoot tolerably well with hard, tight lead bullets, but I doubt that's the norm...

    One of the reasons that Marlin went from microgrooved to cut rifling in the Marlin 1895 (336) in .45-70 was to allow lead bullets to be shot...

    I have 336s in .30-30 Win. and .35 Rem. with microgroove barrels and both shoot extremely well (but I only use jacketed bullets)...

    I have an 1895 with microgroove rifling and it's quite the shooter as well (but, again, I only use jacketed bullets)...

    If I was going to shoot lead bullets, I'd use rifles without microgroove barrels...


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