which twist for 200-600yrd

R

REMY

Member
Hi
Im new to the long range forum and would like some of your wisdom about the following,
first id like to know if they is a relation between say short range (200yrd) and long range(600yrd),that is with the choice of barrel twist with the caliber being the same ,for exsample 308 Win.
Lets say id like to use a 308 bullet made on a 1.150 jacket in the 155-165 range,what twist would you choose for these two distances.
Thank's to all reply's in advance Remy:)
 
I'm no expert but Ill try and help you out. Twist rate is about bullet size 150 & 160 will stabilize with a standard twist. Long heavy bullets require a faster twist rate .Max
 
A 14-twist would be about right.

A 15-twist would be fine for the 155s. The "standard" of a 10-twist in .30s was for 220-grain bullets. In point of fact, I shoot a 12-twist with 210s (1.400 jacket), but that is in a .308-Norma magnum size case, and is marginal.

Edit:

As far as a general relationship between 200 and 600 yards, you might find

http://www.appliedballisticsllc.com/bulletdesign.html

interesting. It's generalities, but as such, they're good ones. 600 is not really long range; that is, you don't need to make the compromises 900-1,000 yard shooters have to make. For example, point-blank configured 6BRs and 6PPCs have won 600 yard benchrest matches, though they're not ideal.
 
Last edited:
you did not say what type of shooting you plan on doing. i would consider a 155/160 a light bullet for 600yds. yes the palma guys shoot 155...but that is the definition of the palma bullet, when thet shoot outside an offical palma match guys shoot 175's in 308's.......that would probably mean a 13 or 12 twist...both of wich will do the 155/160 also.

i shoot 175 berger vld's out of a 13 at 600 in 308.

mike in co
 
12" will get you up to a 185 grain Berger and probably heavier. 13" may top out at 175ish. Going with 14+ will limit you to lighter bullets. I've got a 18" twist for my .30BR that shoots 112 flat bases just fine. Unfortunately, those are just approximations - there is no way to lock down the exact number because it depends on the atmospheric conditions.

The difference between 200 and 600 yards really won't matter. In small arms terms 600 would be considered "short to mid range".

Pick a bullet and go with the slowest twist that will reliably stabilize it. More spin than necessary is bad for accuracy - it exacerbates any slight imbalance in the bullet.
 
You must log in or register to reply here.
Back
Top