1:7 vs. 1:9 twist

[al1599]

I was just wondering about some stuff I headr for AR-15 barrels. I've heard the 1:7 wear out faster than a 1:9. I'm fairly new to the gun world so I try to clear things up when I hear them. And also which one will be able to shoot a 62 grain bullet sufficiently? Thanks in advance for anyone answering the questions. You guys and ladies help me out tremendously.
Alvin

 

[RockyMtnTactical]

Both will handle 62gr ammo just fine.

 

[jpwilly]

My DPMS rifles have 1:9 twist and will shoot right up to 68gr but some 69gr Black Hills Match ammo was keyholeing at 100yrds. 62gr no problems and very accurate!