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Post by wdsbum on Feb 18, 2020 15:15:36 GMT -5
Guess I should try Rem. Core-loc ,its keyholing on focchi 50 gr. v-max anyone know the twist on these barrels? The rifling looks good.
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Post by 4570fan on Feb 20, 2020 18:57:33 GMT -5
50 gr is the typical 222 factory bullet. If you're key holing that weight I would check for damage to the muzzle crown.
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Post by painter on Feb 21, 2020 6:53:22 GMT -5
Guess I should try Rem. Core-loc ,its keyholing on focchi 50 gr. v-max anyone know the twist on these barrels? The rifling looks good. Twist is 1:14. |
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Post by opus37 on Feb 22, 2020 15:57:04 GMT -5
The twist on a typical 223 AR style rifle is 1:8. They can handle up to 70 gran bullet. A 1:12 twist will handle up to a 55 gran bullet without tumbling. So your 1:14 twist likely will only mange to stabilize a 40 to 45 gran bullet. It might mange to 50 but that is pushing it.
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Post by painter on Feb 23, 2020 6:45:13 GMT -5
What velocities are you loading for?
Heavier bullets will require more velocity to avoid key holing.
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Post by woodsbum on Feb 23, 2020 9:57:58 GMT -5
After spending a lot of time experimenting with .222 reloads for the 24V (1 in 14 twist). I have come to the conclusion that bullet length is more of a determining fact in bullet stabilization than anything else. I currently shoot 50 gr Sierra semi pts. Probably the most accurate bullet I have found is the regular Hornady 55 gr. spire pt. Neither of these bullets show any sign of "tumbling" or key holing" at any mid load velocities. There is also a 55 gr. Rem. power Lokt HP bullet that does very well. A few years ago I bought a box of Nosler ballistic tips in 50 gr. I thought these would be perfect because of the 50 gr. They were the poorest bullets I have ever tried. Regardless of velocity, they would "key hole", some would "tumble" and the accuracy was all over the place at any reasonable hunting range. I also did a lot of work with the 63 gr. Sierra semi pts. The accuracy was acceptable but there usually signs of "key holing" at all velocities. As I lay these bullets side by side, the longest (Nosler ballistic tips) are the worst, even though they are lighter in weight. I think today that most of the newer bullets are designed for the faster rifling in the .223, .22/250 etc. and the are just not suitable in our tried and true .222's. Before you start thinking about "crown" or "rifling" problems give some of the good old bullets that have been around for awhile a try. Don't forget to let your barrel cool very well between shots. If you don't your accuracy will be all over the place (but I doubt that the stabilization issue would change). The 24's as a group, particularly the centerfires are pretty finicky to fine tune.
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jimk
New Guy
Posts: 25
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Post by jimk on Mar 1, 2020 2:57:35 GMT -5
My favorite bullets are Speer and Sierras..
In my 24v in 222 I tried Hornady 50 gr sp.
Shot in same holes...
1-14 twist ..
19.5 grs of imr4198...
Keyholing is do to long bullet in wrong twist ...
You should be able to use 50 gr bullets in 1-14 twist no problems...
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jimk
New Guy
Posts: 25
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Post by jimk on Mar 1, 2020 3:05:28 GMT -5
The twist on a typical 223 AR style rifle is 1:8. They can handle up to 70 gran bullet. A 1:12 twist will handle up to a 55 gran bullet without tumbling. So your 1:14 twist likely will only mange to stabilize a 40 to 45 gran bullet. It might mange to 50 but that is pushing it. 50 gr in 1-14 twist is fine ... My 250 sav is 1-14 twist it shoots 100 he fine but made for 87 gr .. I tried 117 gr in it and got keyholing... Too long of bullet .... |
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Post by vancmike on Mar 30, 2020 16:29:06 GMT -5
I have a quantity of .22 bullets for various rifles. My Mdl 24 .222 shot bullets fine up to 55 gr. (Midway cheapies). But all the available literature (and now woodsbum) agree that bullet length is the determining factor in bullet twist.
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