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Old January 3, 2013, 07:37 PM   #1
Join Date: December 16, 2007
Location: austintown, ohio
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marlin 336 ?

Is the micro grove rifling considered a negative in any way? are they sensitive to certain cleaning methods like bronze brushes? Prefer heavier or lighter bullets? thanks as I dont know much about them
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Old January 3, 2013, 08:14 PM   #2
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Designed for jacketed bullets, accurate. Been around since 1950s.

For cast not as good, but will work as long as bullets are sized correctly, have the proper hardness, and are not pushed too fast.
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Old January 4, 2013, 12:40 PM   #3
Jack O'Conner
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Micro groove is a very shallow rifling and shoots best when cleaned regularily. Plain HOPPE'S products work great.

Typically, a Marlin with its 1-10 twist will stabilize the 170 grain bullet variants quite nicely. I've handloaded Hornady 180 grain round nose bullets with hand-filed flat nose for safety. They shoot amazingly tight. But my best groups come from Speer 150 grain flat nose bullets but I can't explain why this is so. I'm not an engineer. I read somewhere that FEDERAL Fusion ammo features Speer HOT-COR bullets.

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Old January 4, 2013, 01:14 PM   #4
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I shoot the Fed 125JHP load in my 336, groups very nice.
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Old January 4, 2013, 01:25 PM   #5
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I think twist rate had more to do with what weight bullet .... the microgroove rifling works better with jacketed bullets than lead, IIRC. Cast boolits do better with the deeper "Ballard" cut rifling, as I understand it.

Eldest's 30A has a 1 in 10" twist, and does well with 150's, 170's and Ok with 110's.
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Old January 4, 2013, 01:57 PM   #6
Join Date: December 16, 2007
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thanks for the quick answers guys. I think I am going to dump my AR and and grab one not much need for the AR.
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Old January 4, 2013, 10:33 PM   #7
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Supposedly Micro Groove is not as suitable for lead bullets as Ballard rifling, thought some shooters have said it works fine for them.
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Old January 4, 2013, 11:08 PM   #8
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MG works great in my old 49DL .22lr and my 444 with jacketed bullets. Haven't tried cast bullets in the 444 because they cost almost as much as the jacketed ones.

One of these days I'll have to start casting my own...
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Old January 5, 2013, 12:26 AM   #9
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Go here for lots of good info on lever action rifles plus suggestions for lead bullet loads in marlin micro-groove barrels.

You kow whats funny? I sold my marlin 1894 in 44 mag with a MG barrel so I could get a newer ballard rifled 44 mag and I have never shot a single lead bullet through it. And the real kicker is that my old MG barreled gun was more accurate than the new gun. Don't sell a micro-groove barrel short till you give it a fair chance.
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