Question about 30-06 bullet weight and accuracy.

[old roper]

RC20, it pretty easy get bullet length
http://www.jbmballistics.com/ballistics/lengths/lengths.shtml

and use Greenhill formula

http://kwk.us/twist.html

figure out correct twist yourself.

My 30-06 I'm shooting Bartlein 1/11.25r barrel 26" long other 30-06 using Shilen 1/13 twist 25" long barrel.

Good barrels being made today and good idea and it's your money nothing wrong calling barrel guys and asking question. JBM and Berger have twist calculators also.

 

[tahunua001]

it is going to depend on your twist rate and barrel harmonics.
30-06A does not equal 30-06B.

 

[Bart B.]

Old Roper did good posting JBM's web site. Its Miller stability calculator that's probably the best one these days. A stability factor of 1.4 to 1.5 seems ideal for best accuracy.

http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi

Spinning bullets too fast make the unbalanced ones fly off the bore axis as they exit the muzzle from centrifugal forces. At least 96% of all bullets are unbalanced to some degree. But the best match bullets are the least unbalanced. Accuracy afficianados, when the tempreature is cooler, dump a few more granules of powder in the case. Cooler weather means thicker air; bullets need a bit more spin rate to stabilize perfectly without wobbling.

tahuna001, how does barrel whip and vibrations (harmonics?) effect bullet stability? I've not heard of this being a factor; anywhere.

 

[10-96]

[QUOTE I don't yet have 30-06 dies which is why I bought factory ammo for testing.][/QUOTE] Texgunner- I didn't catch which factory ammo you bought, but I read that post a few days ago and I've had a weird twitch ever since. Nobody just outright said it, but all but a couple factory loads won't be doing you any tale-telling favors. Yes, 165-168 will likely give you the best potential and a good place to start reloading. But the inconsistency of many factory loads may give you a false impression of your rifle's capabilities and could conceivably lead you down a wrong path

 

[texgunner]

Texgunner- I didn't catch which factory ammo you bought, but I read that post a few days ago and I've had a weird twitch ever since. Nobody just outright said it, but all but a couple factory loads won't be doing you any tale-telling favors. Yes, 165-168 will likely give you the best potential and a good place to start reloading. But the inconsistency of many factory loads may give you a false impression of your rifle's capabilities and could conceivably lead you down a wrong path

All three bullet weights are Federal Fusion. It was the only ammo they had on the shelf that was the same brand and type of bullet in all three weights.