Also related to twist rates, different grain ammo works better at different twists. If you are like me and a marginal marksman, it probably won't make a whole lot of difference, but if you want to try to at least try to use ammo that works better with your twist and barrel length it's worth reading up on this. I admit I went way too deep into this probably, and also that this is all book learning rather than true range experience so your mileage may vary - I like to study before buying so I did this research to decide what twist and length of barrel to buy for a build I'm working on right now. How stable the bullet is does have a large impact on accuracy. If your bullets are tumbling every time you shoot (if you see holes on your targets that aren't circular you know you are having tumbling), you might have an issue with your ammo not working well with your twist. That tumbling can put your shots off by many inches depending on how far out you are shooting.
Here's an example from one source with a cheat sheet - keep in mind there were a lot of variables to calculate this more precisely. The chart below is referenced in this article:
https://www.everydaymarksman.co/equipment/rifling-twist-rate/. He used a ballistics calculator located at this link to make the chart below
http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
The chart, keep in mind that the assumption made is 2800 fps which is dramatically impacted by barrel length - for example, a 10.5 barrel is closer to 2500 fps instead of 2800 so this chart is probably off:
For a build I'm working on right now, I wanted to know how close this chart would be to what I could get with my specific ballistics. I went to the site this guy used to calculate and figured out how to use the calculator.
Since the barrel I selected is a 1/8 twist and 10.5 long, I found another site that helped me guess at what the fps would be, around 2500 instead of 2800 used for the picture above. Also, I wanted to know how much impact temperature swings might make so I calculated at 2500 fps, for temps ranging from -9 to 90f. For 62 grain 5.56 ammo this came to a range between 1.4 and 1.8 on my barrel - you'll note on the chart above that 1.8 was the listed value for 62 grain at 59 degrees. At 59 degrees, my lower fps actually got me a 1.698 (better) value. This number is called the "Miller factor" and the formula originated with Don Miller and Dave Brennan. They say that you want a range between 1.3 and 2.0. There was an article in Precision Shooting from 2005 that had the formulas that were implemented in this calculator, you can read it at this link if you really want to get into the math
http://www.jbmballistics.com/ballistics/bibliography/articles/miller_stability_1.pdf
The thing I found difficult to do the calculations correctly was related more to getting the right bullet lengths for 55 grain vs. 62 grain, etc. It's not something easy to Google, I found the length for 55 grain somewhere here on these forums (.739) and for 62 grain I used US government specs for their standard 5.56 62 grain (.907), in reality each manufacturer has their own range of lengths for the bullets they use. Also, these lengths vary even within one manufacturer, if you bought bullets to reload and measured them you'd find variation enough to affect the calculations in a minor way, probably not enough to be off enough for any concern.