twist???

[ardead]

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

[fguffey]

ardead,

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

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

f. guffey

[bigbulls]

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.

[bronko22000]

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

[eldeguello]

ORIGINAL: ardead

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

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!