Micro Groove v. Ballard rifling in Marlin rifles


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Lone_Gunman
June 16, 2007, 06:34 PM
What is the disadvantage of micro groove?

Can you shoot lead bullets through a micro-groove barrel?

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Onmilo
June 16, 2007, 06:40 PM
You can shoot lead bullets through Micro Groove barrels, however, performance will not equal what you will experience with a conventional or Ballard type rifled barrel.
Micro Groove barrels are also much more difficult to completely remove lead fouling from. Jacket material is hard enough in itself to completely remove.

Micro grooves were designed for and work best with jacketed bullets.

dfariswheel
June 16, 2007, 09:09 PM
Except in .22LR.

Marlin has used Micro-Groove rifling in their Model 39-A lever action .22's since the early 1950's.

They have gone back to standard cut, or "Ballard" rifling in the center fire rifles due to better accuracy from these larger calibers.

DWARREN123
June 16, 2007, 09:40 PM
I have heard that Mirco Groove is for jacketed bullets while Ballard is more friendly towards lead except for their rimfires.
Micro groove has, usually, more shallow rifling and grabs jacketed bullets better while Ballard is deep to grab on to lead bullets better.

tube_ee
June 17, 2007, 12:12 AM
folks will re-orient your thinking on cast bullets in micro-groove barrels. Check them out. IIRC, the key is to use a larger bullet, as normally-sized slugs don't obdurate well in the multiple, shallower grooves. Thus, accuracy suffers and leading is made much worse.

My Marlin is Ballard-rifled, and loves lead bullets.

--Shannon

aka108
June 17, 2007, 01:44 PM
No experience with micro-grove except in 22 rimfire. Been shooting a Marilin 39 I bought in 1955, about 52 yrs. Accuracy is extremly good.

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