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Author Topic: 1-12 vs 1-14 twist rate in .223 using 50gr to 40gr bullets  (Read 2768 times)

Offline dan2116

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I am getting a new barrel put on a Remington 700 action in .223 and am torn between twist rate. Will be shooting H335 powder with exclusively 50gr Sierra BlitzKing and maybe 40gr B/K bullets. Smith recommended 1-14 . I have an older Rem. 700 .223 with 1-12 that performs very well .Is 1-14 better than 1-12 with this bullet weight and caliber. Would a bit faster twist better in wind conditions ?


Offline Greg110

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You "might" be able to get more speed from the 14 twist, but the 12 twist will be able to handle bullets heavier than 55 grains.

Offline dan2116

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With the 50gr bullet I will be using is there a appreciable difference in accuracy between a 14 twist vs a 12 ?


Offline mikecr

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I think the 50Bk will shoot better from a 223 in 12tw.
14tw provides marginal stability with it, at best.

My accuracy suffered using the 50Bk from a Cooper in 223(14tw). Well, it shot good, but not as good as the gun was capable of. I switched to a flatbase 50gr bullet and groups cut by 1/3 immediately. I know this is anecdotal, but there is nothing wrong with Bks, and 12tw wouldn't hurt.

Offline KEYBEAR

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  I have two rifles set up with barrels with 1-14 twist both 223,s  both shoot in the 2,s or better with 52 up to 68gr. bullets .  I never shot anything bigger than 68gr. as that is as big as I have .    I really like the 1-14 but a 1-12 would not do any different .  If your going to shot bullets in the 52/53 area 1-14 works very well .

Offline Otter

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If I was sure I would only use up to 50 grain bullets, I would probably opt for the 14 twist.  In theory, all other factors being equal, it should be slightly more accurate, and produce slightly faster velocity.  Cooper uses a 14 twist for a good reason and that is accuracy, although as Mike posted that isn't always the case.

But I would still go with a 12 twist.  I like to leave my options open in case I can only get 55 grain bullets, I know I could shoot them as well.


Offline mikecr

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Under twist is often worse than over twist.
And, you can't go only by bullet weights when deciding on twist.
A 223 won't torque much in either twist, and there are no 22cal bullets that would be considered over-spun from 12tw @ 223 velocities.
IMO, 12tw should be the standard twist for the 223.

My Cooper shot under 1/2moa with 50 blitzKings. It shoots 1/4moa with 50 Jayners, which are very similar(I didn't even have to change seating or load).
By my calcs the Sg of 50BKs @ 14tw/3500fps, Sea Level & 75deg is 1.17 (marginal). Possibly at higher altitudes the Blitzkings would have shot better..
So same conditions with the 50 FB Jayners  Sg = 1.34 (better)
If this barrel was 12tw, SL/75deg conditions, Sg would be 1.60/1.82 (which wouldn't hurt a thing).

Cooper does go under-twist with their barrels pretty much across the board.
But it's my contention this is more of a pain than a gain. I also shoot way further than cooper's test groups, and outdoors..


 

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