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Long Range Hunting & Shooting
Mike Rock or Lothar Walther? >> For .308
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<blockquote data-quote="Dave King" data-source="post: 7430" data-attributes="member: 3"><p>I believe the LW are polygonal rifled while the Mike Rock are cut conventional rifling.</p><p></p><p>I've had both polygonal (Pac-Nor and Harris Gun Works) and cut conventional (Mike Rock) and find that there are differences. The polygonal barrels I've tested with monometal bullets (Barnes and Lost River) don't perform as expected or to nearly the accuracy they exibit with copper jacket lead. I don't shoot or test any solid monometal bullets out of these type barrels any more as these bullets don't seem to take kindly to be re-sized to the smaller barrel inside dimensions nominally .307nnn. Pressures go high when using the monometal bullets with published "safe" loads and it's been counter-productive as far as I'm concerned. If you're not going to use solid bronze/brass/alloy bullets it's probably not an issue.</p><p></p><p> The conventional rifled barrels seem more forgiving in the bullet size department and are nominally .308 I.D..</p><p></p><p> Accuracy between the two types seems to be similar when using copper-jacketed bullets... There are reports that the polygonal barrels are "faster" and more resistant to throat erosion... I haven't been able to do a side-by-side comparison but haven't seen anything to dismiss these claims either.</p><p></p><p> Hope this helps a bit.</p></blockquote><p></p>
[QUOTE="Dave King, post: 7430, member: 3"] I believe the LW are polygonal rifled while the Mike Rock are cut conventional rifling. I've had both polygonal (Pac-Nor and Harris Gun Works) and cut conventional (Mike Rock) and find that there are differences. The polygonal barrels I've tested with monometal bullets (Barnes and Lost River) don't perform as expected or to nearly the accuracy they exibit with copper jacket lead. I don't shoot or test any solid monometal bullets out of these type barrels any more as these bullets don't seem to take kindly to be re-sized to the smaller barrel inside dimensions nominally .307nnn. Pressures go high when using the monometal bullets with published "safe" loads and it's been counter-productive as far as I'm concerned. If you're not going to use solid bronze/brass/alloy bullets it's probably not an issue. The conventional rifled barrels seem more forgiving in the bullet size department and are nominally .308 I.D.. Accuracy between the two types seems to be similar when using copper-jacketed bullets... There are reports that the polygonal barrels are "faster" and more resistant to throat erosion... I haven't been able to do a side-by-side comparison but haven't seen anything to dismiss these claims either. Hope this helps a bit. [/QUOTE]
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Mike Rock or Lothar Walther? >> For .308
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