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Bullet Weights for 1 in 12 .223 Rem Cooper Varmiter
 Moderated by: Timberghozt, Rockydog, fryboy
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 Posted: Sun Feb 19th, 2012 01:37 PM
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RobertInIowa
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I have a Cooper Firearms Montana Varmiter Single Shot Bolt in .223 with a 1 in 12 twist rate and I'm confused about what weight and/or style bullets should provide the best groups and what weights a 1 in 12 can even handle.

I'm new to the forum but i am very impressed with the tons of info in the older threads i've been sleeplessly reading each night. You guys ROCK as my younger friends would say.

Thanks in advance.



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 Posted: Sun Feb 19th, 2012 01:52 PM
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Robert, Here's a twist rate chart for .223. It's not as dependent on bullet weight as it is bullet length. With lead core bullets you might have trouble stabilizing much more than 55 grain bullets with a 1:12. MOst of the 55s I measured are right around .70 in length. Some plastic tipped 50s are longer than that. RD

http://le.atk.com/pdf/223_MinimumTwistRates.pdf



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 Posted: Sun Feb 19th, 2012 02:06 PM
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RobertInIowa
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Rockydog, thanks for the link, I'll take a look right now.



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 Posted: Sun Feb 19th, 2012 04:18 PM
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Plainsman
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I have a fine little CZ 527 American in .223, in 1:12. It is unbelievably accurate with 55s and lighter. Above 60 it starts to keyhole like mad, within just a few yards. Some tests with 45-grainers are on the books for when the weather warms up.



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 Posted: Sun Feb 19th, 2012 04:37 PM
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RobertInIowa
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yea, I have a bunch of 60's I bought that look like they're destined for my AR. Picked 'em up before I knew better on the twist rate, same for a box of Nosler 77's. I'm temped to buy another rifle just so I can load these bullets. But SWMBO would skin me. Luckily I've got a lot of 52's and 40's to load.



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 Posted: Mon Feb 20th, 2012 08:19 AM
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RobertMT
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RobertInIowa wrote: yea, I have a bunch of 60's I bought that look like they're destined for my AR. Picked 'em up before I knew better on the twist rate, same for a box of Nosler 77's. I'm temped to buy another rifle just so I can load these bullets. But SWMBO would skin me. Luckily I've got a lot of 52's and 40's to load.
How many of the 77gr CC do you have, is it a box of 100, 250 or 1,000?  I probably could do a trade for some 50gr BTs.  If interested PM me.



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 Posted: Mon Feb 20th, 2012 01:45 PM
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TMan51
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Plainsman wrote: I have a fine little CZ 527 American in .223, in 1:12. It is unbelievably accurate with 55s and lighter. Above 60 it starts to keyhole like mad, within just a few yards. Some tests with 45-grainers are on the books for when the weather warms up.Plainsman, what is the load you're using? 

I have very good luck with my CZ527 American with 60gr Hornady HP/SP and 63gr Sierra Semi-SP's out to 300yds. I see very little difference in accuracy from BL-C2 and W748 using CCI 450's. They are very good "hide" bullets for foxes and coyotes.  All of those bullets turn in 1.5"/5shots at 200yds from a rest, an easy MOC, (minute of coyote). 

Absolute best accuracy in my rifle is with the 50gr Sierra Blitz and top end charges of BL-C2 or W748.  Both powders shoot best with CCI 450 primers.  Groups run from 5/0.25-0.50 at 100yds, and on a calm day, and <2" @ 300yds.  Hornady 50gr SX is also very good, the 55gr versions are real close.  It wears a Leupold 3X9X AO Compact.  Oddly, my rifle doesn't shoot well with bullets less than 50gr, except in Trail Boss reduced loads ??



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 Posted: Mon Feb 20th, 2012 03:05 PM
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RobertInIowa
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RobertMT: I have most of a box of 250 Nosler 77's, I'll have to count 'em. I also have the better part of a 1000 Hornady VMAX 60's if you're interested in those, also will need to count, gonna need lots of fingers there.

RobertInIowa



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 Posted: Mon Feb 20th, 2012 03:26 PM
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SavageShooter



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Any of those bigger pills that RobertMT doesn't want, let me know. I have a bolt action .223 that is a 1:7 twist, so she'll shoot the bigger pills.



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 Posted: Mon Feb 20th, 2012 04:05 PM
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RobertMT
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PM me with your address, I'll trade 300 50gr BT for the "most" of box of 250ct, 77gr CC, no need to count them, most of box is close enough. PM is at top of home page, it'll be spinning, you have new message. just reply to PM if interested. Should fit in small flat rate box, for mailing.



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