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Old 08-02-2018, 02:48 AM
GUNMIKE GUNMIKE is offline
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Default 62 gn ammo

I know that this has to have been discussed before. But will the sport II be able to reliably chamber the 62 gn round?
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Old 08-02-2018, 08:14 AM
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My Sport II runs fine with PMC x-tac 5.56 62 grain. 100s of rounds with no issues.

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Old 08-02-2018, 08:54 AM
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Will the 1:9 twist stabilize the 62 grain bullet? Is anyone shooting this combination accurately?
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Old 08-02-2018, 09:08 AM
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Twist rate performance is not determined by weight but by length, 62 grain M855 ball ammo will work fine in 1/9, the extra long 62 grain M856 800 meter tracer is the reason the military picked the 1/7 twist. Rule of thumb is that 1/9 is good for up to 70 grain, 1/8 is better for 70-77 grain, be aware though that accuracy of bulk grade M855 is not that great to begin with.

Last edited by Mack; 08-02-2018 at 09:14 AM.
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Old 08-02-2018, 09:12 AM
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Any 62 gr round of standard OAL in 5.56/.223 will ‘chamber’ in a Sport II. If the question is really will it be stable in the 1:9 twist barrel, it should be, within the vagaries of individual barrels.
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  #6  
Old 08-02-2018, 12:17 PM
hugger-4641 hugger-4641 is offline
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I shoot 62gr American Eagle and PMC and they both perform fine in my 1/9 and 1/7 barrels. I haven't tried past 300yds, but at 300yds my worst is about 3" group.
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Old 08-03-2018, 10:41 PM
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I have a 1:9 twist bolt action .223 that loves 75 gr. ammo. People make too much of the limits of 1:9. It's true my Sport won't shoot ammo that heavy but it shoots 62 gr. just fine.
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