How important is rifling rate of twist?

[Pak75]

You will be fine shooting 62gr ammo out of a 1/12 twist barrel. It is not optimised for that bullet weight but there is really no need to change the barrel if you are just blasting off rounds with a slide fire spray and pray stock. I have never seen a 1/9 barrel that is ummarked. The 1/9 barrels came out as the bullet weight moved up to 62gr. The current military 1/7 barrels are optimised for even heavier longer rounds used by the military (72gr, 75gr) The 1/9 barrel seems to be the middle of the road if you want to shoot ammo of various weights. The 1/7 barrels are all the rage because that is what Uncle Sam uses in the current M4s. I have both the 1/12 Colt 20" barrel and a Rock River 1/19 16" barrel. Most of the ammo I shoot is either cheapest 55gr or surplus 62gr green tip. I don't really see much of a difference unless I really try for utmost accuracy at long range from the bench. I think the accuracy/stability issue will be more of a quality of ammo manufacture than barrel twist rate in your case.

I see now from your reply you have an OLY barrel.

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