1 in 7 twist 5.56

[trial&error]

If your shopping for a barrel 1:8 seems to be more of the sweet spot. I shoot 55gr sp to 80 gr Amax a dime will cover 3 round group with some and touch all 3 with others. And an earlier post is right 80 GR has to be loaded one at a time, too long for mags.

 

[chase870]

Thanks guys I was also wondering about the bullet performance with the BTHP bullets, not necessarily accuracy but expansion, and exit wounds etc. Is their a reason I dont see vmax or other ballistic tips in the heavier bullets

 

[trial&error]

Performance for hunting? or long range? 55gr sp kill deer no problem.

 

[rosewood]

Thanks guys I was also wondering about the bullet performance with the BTHP bullets, not necessarily accuracy but expansion, and exit wounds etc. Is their a reason I dont see vmax or other ballistic tips in the heavier bullets

A ballistic tip with heavier bullets makes the bullet longer and becomes more of a seating issue. The 65 SGK is about the heaviest bullet designed for deer I have seen. Most of the rest are good for varmint. Vmax are varmint bullets and you typically go light and fast and the bullets have thin jackets designed to expand violently.

Rosewood

 

[nmurph]

You can't over-stabilize a bullet. You can spin one so fast that it flies apart.

 

[bullethead]

Bullets can be over stabilized.
An all copper bullet will not fly apart due to the forces of spinning too fast but the nose will ride high off center. Within 200yds it would be negligible, at longer distances it will have an effect.
http://www.shootingrangeindustries....t-calculation-gyroscopic-precession-equation/

https://riflebarrels.com/a-look-at-bullet-imbalance-and-twist/

http://www.nennstiel-ruprecht.de/bullfly/index.htm

https://www.fulton-armory.com/faqs/Genl-FAQs/Fly/fig15.htm

 

[rosewood]

They can call it what they want, but it is impossible to over-stabilize a bullet, either it is stabilized or it isn't. How is it possible for anything to be too stable? Unless you want it to wobble.

That terminology is flat out wrong. They can say it is spinning to fast. Now if they are calling the rate of spin, stabilization, then maybe so. I guess they are making up their own definitions to words.

Kind of reminds me the statement "same difference". What the heck does that mean? Same difference is 3-2=1 or 5-4=1. They should be saying "same thing". Many incorrect terms are reused over and over again incorrectly and folks believe it is gospel.

sta·bi·lize
(stā′bə-līz′)
v. sta·bi·lized, sta·bi·liz·ing, sta·bi·liz·es
v.tr.
1. To make stable or steadfast.
2. To maintain the stability of (an airplane or ship, for example) by means of a stabilizer.
3. To keep from fluctuating; fix the level of: stabilize prices.


Rosewood

 

[Jester896]

it requires a certain twist rate to stabilize a bullet and that is in relation to its length...if you spin it faster or slower than it is required...you get a different reaction and that reaction may be it is no longer as stable....no matter which way you go....

from your definition..#3...to keep from fluctuating

 

[Old Bum]

I've never had a problem keeping a 2" group at 150yds. with a 1:7 twist shooting 55gr. bullets. I know that ain't a real tight group for some folks but it's fine for me just plinking.

 

[doomtrpr_z71]

I've never had a problem keeping a 2" group at 150yds. with a 1:7 twist shooting 55gr. bullets. I know that ain't a real tight group for some folks but it's fine for me just plinking.

Anybody trying to claim they shoot lees than 1in groups with 55gr like xm193 needs to check what an inch really is regardless of the barrel twist.