tomapleleafss
CGN Regular
- Location
- Southeast SK
Just hoping to confirm, does the Ruger Precision (6.5 mm CM) come with a right or left hand twist? I am assuming right hand but cannot find anything on the ole google machine to confirm this.
Ruger Precision - Right or Left twist
- Thread starter tomapleleafss
- Start date
Why would it matter? - dan
tomapleleafss
CGN Regular
- Location
- Southeast SK
Gyroscopic (spin) Drift and Coriolis Effect
prairie lover
CGN Regular
- Location
- southern MB
Spin drift yes but coriolis?
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
RH... nothing made in NA is LH twist... I doubt anything anywhere is LH twist unless custom speced. Certainly, nothing in readily available rifle or barrel specs.
Jerry
Jerry
tomapleleafss
CGN Regular
- Location
- Southeast SK
Never ever would have thought of that.
tomapleleafss
CGN Regular
- Location
- Southeast SK
Check out Bryan Litz awesome article on spin drift and Coriolis effect.
http://appliedballisticsllc.com/ballistics-educational-resources/articles/
http://appliedballisticsllc.com/ballistics-educational-resources/articles/
Unless it came from the Petersen rifle ranch in SK, in which case it almost always had LH twist.
tomapleleafss
CGN Regular
- Location
- Southeast SK
Confirmed with Ruger, all Precision rifles are right hand twist. +1 to Jerry at Mystic Precision.
The effect it would have on that would be so minimal it would be near negligible. How you follow through on the rifle, and environmental conditions such as wind will have much more drastic effect on your shots.
Depends on what range you are shooting at. Spin drift at 1000 yards (left or right depending on twist) is supposed to be 8-12 inches. Coriolis supposed to be about 3 inches horizontal at 1000 yards (right in northern hemisphere).
If you can shoot appreciably better with a LH twist barrel over one with a RH twist barrel, then you are one of a kind. If they gave an advantage, everyone would be shooting LH twist rifles.
Have you ever missed a target because of spin drift or Coriolis?
There seems to be two camps on this. Those that believe that you should have SD and Coriolis turned on at all times, and those that say you should have both turned off as it doesn't matter/provides erroneous results. I've spent a lot of time and $$$ training at some of the top precision rifle schools down in the U.S., and have been to training where both sides have been advocated. Instructors for both camps have racked up a bunch of wins on the competition circuit (among other achievements in the shooting community), leading me to believe that it really doesn't make much of a difference either way, for the majority of the shooting that we do.
Some people are now saying that 3DOF based software (such as Applied Ballistics) cannot accurately model SD and Coriolis, and in fact exaggerate their effects on ballistics. 4DOF and 6DOF ballistic software is supposedly much more accurate for accounting for these effects, and resultingly, the effects of SD and Coriolis on ballistics are much less than previously thought. The current conventional wisdom on SD and Coriolis is being challenged with newer and more accurate software, so I'm sure that this debate will only get more heated in the coming years.
At the end of the day, proper fundamentals and wind reading is much more crucial to getting hits on target than SD or Coriolis.
Wouldn't disagree with any of above. In comparison to all other variables SD and CE are small potatoes. However many long distance shooters are very OCD about these things. If the numbers I used above are accurate (debatable I agree) we can see a difference in horizontal impact from perhaps 11 inches right to 5 inches left at 1000 yards. This is over a minute of difference. Really what I was saying was I understand why the question was asked, and I believe it might be worth considering.
