twist???
 

witch is it the slower the twist the heavier the bullett or the faster?????

RE: twist???
 

ardead,

http://www.chuckhawks.com/rifle_twist_list.htm

http://www.gunnersden.com/index.htm.rifle-barrel-twist-rates.html

f. guffey

RE: twist???
 

The longer, not heavier, the bullet is the faster the barrel twist needs to be to properly stabilize it.

For example........ a round nose lead bullet of "X" weightwill need "Z" twist rate, say 1-14,to be properly stabilized. A pointed, boat tail, lead nosed bullet of equal weight is signifigantly longer than the round nose bullet and will need a slightly faster twist of maybe 1-12, and an all copper, pointed, boat tailbullet of the same weight is even longer and will need a faster twist still of maybe 1-10.

RE: twist???
 

Ditto Bigbulls - And to add to that - I'm almost positive the length is also in relation to diameter.

RE: twist???
 

Required twist is determined by bullet LENGTH, not weight. Since heavier bullets are generally longer, of course, they need a faster twist than a shorter (lighter??) one. Use the Greenhill formula to calculate the required twist for a given bullet:

Twist needed (in calibers) = 150/length of bullet (in calibers.)

However, often a short, stubby round-nose bullet can weigh as much or more than a long, pointy boattailed one. In such cases, one might be able to get acceptable performanbce from the short, heavy bullet even if the twist is to slow for a long pointed one of the same or even less weight.

I remember that the 1/12" twist originally used with the .244 Remington would not stabilizea105-grain Speer spitzer, but worked fine with the 105-grain Speer round-nose!