.30 caliber twist rate?

[JDL]

Would a 1 in 12" twist .30 caliber stabalize the Lyman 311284 boolit? Thought I'd ask before wasting powder and primers. Thanks -JDL

[Char-Gar]

I don't think you will have any problems.

[Bass Ackward]

Would a 1 in 12" twist .30 caliber stabalize the Lyman 311284 boolit? Thought I'd ask before wasting powder and primers. Thanks -JDL


JDL,

As usual, .... depends. Logic and formulas say no. Especially at "cast" velocities. But it all depends. I have seen it both ways.

Better yet, you tell us!

[joeb33050]

A 1 in 12 30 caliber barrel will stabilize a bullet 1.19" long (maximum), weighing approximately 208 grains. According to Greenhill for the length, and the .82 rule for the weight.
I don't know how long a 311284 is.
Stabilization is pretty independent of velocity, means that at any reasonable rifle velocity of ~1300 fps or more the bullet stabilizes.
Stabilization IS affected by bullet quality, bore quality and bullet density. Better bullets and bores mean slightly longer bullets will stabilize, and denser bullets = 30:1 vs linotype if slightly longer will stabilize.
joe b.

[1Shirt]

Think Bass got it right-just depends. Have come to believe that all rifles are female.
1Shirt!:coffee:

[9.3X62AL]

Have come to believe that all rifles are female.
1Shirt!:coffee:

Most rifles under 30 caliber shooting cast boolits certainly are.

[w30wcf]

JDL,

I have used the Lyman 311284 in both 10" twist (Marlin 336 & Rem 788 .30-30's) and 12" twist barrels (Winchester '94 .30-30's) and they worked just fine from both twists at 1,600 f.p.s. and above.

I did not try shooting them below 1,600 f.p.s., but at that velocity in the 12" twist , accuracy remained good......all the way to the 500 meter steel ram target.

w30wcf

[Larry Gibson]

Would a 1 in 12" twist .30 caliber stabalize the Lyman 311284 boolit? Thought I'd ask before wasting powder and primers. Thanks -JDL

I have used 311284 and 311299 in the 30-30 and the .308 with 1-12" twist barrels. Most loads were above 1500 fps and accuracy was very good to 200 yards. I did load the 311284 cast of pure lead down at 500 fps out of a 24" M94 working on some Paco loads. They cut nice round holes at 50 yards with no indication of instability.

Larry Gibson

[cherok9878]

JDL, Haven't used the 311284 but have shot quite a bit of the 311299, 1903-A3 30-06, 1-12" twist, i believe. The 311299 gives outstanding accuracy at every loading I have tried, 1600 to above 2000 FPS. I made a jig to give the bullet a meplat and it still shoots. Bullet starts out with lube and GC at 208 Gr, with meplat it runs 196 to 198 Gr. This is out of air cooled WW.

[felix]

Military 30-06 barrels are 10 twist, unless the gun has an experimental barrel and so marked. ... felix

[Paul B]

The idea that a 1 in 12" 30 caliber will not stabilize a 220 gr. bullet, be it cast or jacketed in just plain BS.
While the following is about jacketed bullets, it does prove, to me at least that 99 and 4/100s percent of the "egg-spurts" in the gun rags do not know their rear end from a very large hole in the gound, and when you prove them wrong, will call you a liar.
i haven't tried 220 gr. bullets of any kind in a 30-30, although I shoot 190 gr. cast in my M94, however, I have shot 220 gr. jacketed bullets in a custom barreled 30-06 with a 1 in 12" twist. I had it made up for shooting cast bullets which it does very well. Groups were in the 1.0-1.25" range at 100 yards. One of the well known "egg-spurts" in I forget which, Rifle or Handloader said that you can't shoo those bullets in a twist that slow. I wrote him a very long letter and included several targegts shot with the rifle. I even told him that if was ever down my way, he could check out the twist rate, watch me load the ammo and we'd shoot it at the range. I get back a nice letter stating that , "He sttod corrected." and how it was nice that people like myself take the trouble to research blah blah blah!
About six months later, he does an article on "Myths in shooting", or some such and in the article literally calls me a liar. It's adamn good thing I didn't tell him about my tests shooting 220 gr. bullets in a .308 with a 1 in 12" twist. Some money betting at the range with that one would have cost him a lot of change.
I recently bought a Lyman #311284, but haven't had time to load any up and shoot them. You can bet they will be shot in that 1 in 12" 30-06. Just how fast they will have to be shot at remains to be seen though.
Paul B.