Calculating rifling twists?

[3leggedturtle]

is there a formula to figure out twists for caliber compared to weight. I.E. 30 cal 150gr RN could you get by with 1-14 or even 1-16. In looking at the .30 Herrett it shows 150 gr at 2000FPS and it stabilizes.(in Hornady 7th edition) I also shoot 170 Lee RN's at about 1300 with no evidence of keyholing in .30 herret. thnaks todd

[crs]

Todd;
here is an interesting link that discusses twist from several angles:

http://www.uslink.net/~tom1/twistrate.htm

It even includes a calculator to help with the computations!

[AJMD429]

This article also has lots of information and background on how the stuff is arrived at . . .

There are a couple of useful tables, by length (the 'real' determinant) and by weight (what we usually use).

http://www.lasc.us/Brennan_2-3_Twist.htm

[3leggedturtle]

Hey thanks those are great articles and information

[Paladin]

Hey thanks those are great articles and information

+1, It will come in handy in amonth or two.