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 Rifles, Bullets, Barrels & Ballistics

# Barrel twist

#1
05-18-2002, 06:05 PM
 Junior Member Join Date: Jan 2002 Posts: 10
Barrel twist

Hey ya'll!

I need some info on barrel twists for 30 cal. JLK 190 & 210. I know the 10 twist is norm, but would the 11 twist be better? [img]images/icons/confused.gif[/img]
#2
05-18-2002, 08:05 PM
 Posts: n/a
Re: Barrel twist

Taz--
What cartridge /velocity are you using? CJ
#3
05-18-2002, 09:41 PM
 Junior Member Join Date: Jan 2002 Posts: 10
Re: Barrel twist

I am using the 300 wsm. Velocity - I'm guessing 2950 to 3050.
#4
05-19-2002, 08:40 AM
 Posts: n/a
Re: Barrel twist

Taz -- I forgot to ask the bullet length, so try this formula--
(180 x bullet dia x bullet dia)/ bullet length = rate of spin. If your velocity is below 2800 fps, use 150 instead of 180 as your constant. CJ
#5
05-19-2002, 10:29 AM
 Silver Member Join Date: Mar 2002 Location: McNeal, AZ Posts: 368
Re: Barrel twist

Chris,

What formula do you use to determine your first number ( 180 or 150 ) versus Velocity?

I was thinking that with the formula you gave, I might be able to reverse it when working up new loads. With a known twist, it might help me look for a specific window of velocity for best bullet performance. But I can't find how your beginning numbers relate to the bullets speed.
__________________
If I can kill that coyote from here, Will you walk out to get him?
#6
05-19-2002, 10:40 AM
 Posts: n/a
Re: Barrel twist

Tim-- Good Question-- I pulled it off of one of the ballistics sites and I don't remember which one. I'll try to find it and get back to you. I don't remember seeing the formula, just the numbers given as constants. I'll try to look it up tonight. Chris

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