Porting effects on accuracy

[WheelgunConvert]

Does barrel porting make a significant difference on the blowby as the projectile exists the crown?

I have several rifles that are muzzle compensated, but essentially nothing truly ported. I’m not counting gas guns as ported.

Thank You!

Bevan

[243winxb]

Mag-Na-Port should reduce blowby. Accuracy is normal with it on my S&W M29 44 mag. If it was going to hurt accuracy, the base of the cast bullet, without a gas check ,would show up on target.