Opinion on 180 Grain Bullet Out of a 1:12

Discussion in 'Long Range Hunting & Shooting' started by HJW, Oct 11, 2011.

  1. HJW

    HJW Well-Known Member

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    I am currently shooting a Remington 700 SPS Tactical, completely stock.
    I was thinking about shooting 180 grain Nosler Ballistic Tips out of it.
    Does anyone think that my 1:12 twist ratio could handle this bullet?
    Would it be ideal?

    Best Regards,

    Hunter J. Welch
     
  2. WildRose

    WildRose Well-Known Member

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    .308win or??? 180's really need a 1:10. I'd think you'd do much better with 160-170's at the heavier range and it should be superior with 155-165's.
     
    Last edited: Oct 11, 2011

  3. The Surgeon

    The Surgeon Well-Known Member

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    Ditto to WildRose.
     
  4. Kevin Thomas

    Kevin Thomas Well-Known Member

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    Hunter,

    A quick check of Bryan Litz's work indicates a nominal stability factor of 1.3 for this combination. Stable, but getting into marginal territory. At the best case scenario, it goes up to around 1.49, which indicates good stability. I'd give it a shot and see what happens. Given that you've got a buttoned there, and they tend to vary a bit, it could be a tad faster than a true 1x12", which would be a good thing for you here. Of course, it goes both ways and could be a bit slower, too. If so, you're even closer to the edge. In any case, it's worth trying just to be sure.
     
  5. Bart B

    Bart B Well-Known Member

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    I've shot a couple thousand Sierra 190 HPMK's from a 1:12 twist barrel in a 7.62 NATO converted Garand. Excellent accuracy indeed; they'll hold 4 inches at 600 yards and easily 10 inches at 1000. Not too shabby for a gas gun with new cases in a mil spec chamber. And several hundred Lapua 185 grain FMJRB and Sierra 180 grain HPMK (the old Sierra's with a longer boattail) match bullets from the same barrels giving the same accuracy. These were favorite long range loads (600 yards and further) for both the USN and USAF Rifle Team's 7.62 NATO Garands Civilians used them too with much success

    The US Army Rifle Team was famous for pulling the 172 gr. bullet from 7.62 NATO match ammo and replacing it with a Sierra 180 HPMK. In their M14NM's 1:12 twist barrels, they won a lot of matches setting some records along the way.

    A couple hundred Sierra 180 HPMK's from a 1:13 twist .300 Win. Mag have easily held 7 inches at 1000 from a 9 pound hunting rifle. And a few hundred 180 Sierra HPMK's from a .30-.338's 1:12 twist barrel; very accurate at 600 and 1000 yards.

    And Winchester's Model 70 target rifles in .308 Win. gave excellent accuracy with Lapua 185 graing match bullets; their .3092" diameter did very well in Winchester's .3086" groove diameter barrels.

    Yes, a 1:12 twist will shoot 180's very well indeed as long as they leave over 2650 fps. They've been doing it for decades.
     
    Last edited: Oct 11, 2011
  6. big mike 2121

    big mike 2121 Well-Known Member

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    Not hi jacking but what about bullet weights for 1:11.25 in remington 5R? .308
     
  7. Bart B

    Bart B Well-Known Member

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    When the .308 was "the" cartridge for high power matches, folks used weights from 168 through 200 grains in their 1:11 twist barrels. In fact, the most accurate rifles through 600 yards I know of are .308's with a 1:11 twist 26-inch barrel shooting 190's.

    Your 1:11.25 will do well with these bullet weights. Reduced loads with 150's are also very accurate.
     
  8. Jerry M

    Jerry M Well-Known Member

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    Hunter,

    Just try a box; you may be pleasantly surprised at the results. Your rifle will give you a definitive answer. Don't over-think stuff.
     
  9. xAsylum

    xAsylum Member

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    I say you use something a little smaller with a 1:10 twist.
     
  10. xAsylum

    xAsylum Member

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    Correction, 1:12!
     
  11. backwoods83

    backwoods83 Well-Known Member

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    He stated he is shooting an sps tactical, just a plain ole 20" 1:12 twist barrel not a 5R, you should use a 168grn NBT instead of the 180, nosler has them listed at .490 vs .508 for the 180s the 168 is different than the other 30 cal NBTs, it has a longer boattail. As Kevin said remingtons tooling can be off an it can fall between 1:11.5 and 1:12.5. I loaded some 155grn nosler custom comp. 168grn SMKs, and 178 hpbt hornady match, for a friends dad that shoots a sps tactical it liked the 168s best, then the 155s, and the best group he got with the 178s was just over 1.25".
     
  12. rdsii64

    rdsii64 Well-Known Member

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    I have a Howa 1500 varmint in .308 with a 12 twist barrel. 180 Noslers will work just fine in a 12 twist barrel.
     
  13. WildRose

    WildRose Well-Known Member

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    Congratulations. I'm glad they work in your rifle.

    Every rifle and every load however is different, and for 180gr and heavier bullets a 1:10 is what is recommended.

    Guidelines are not absolutes.
     
  14. liltank

    liltank Well-Known Member

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    What's up? You looking for an argument with that comment? Every load is different, but 180's in a 1:12 will work just fine. As long as it is a true 1:12. I bet with the right load combo a 1:13 would hold them true also, but is going to be right on the edge of being unstable.

    Tank