I don’t wish to seem argumentative or disrespectful but I don’t use calculators I let the target tell me what is stable, I’ve seen some very fine groups shot with both twist.
Again I can only comment on the Bullets I have personal experience with.
J
Until one goes out an shoots, the calcs are about as good an option as we got for deciding on stuff like twist rates.
And again its all personal preference as to what bullets you want to use, but if you say you want to shoot bullet X (or type X bullets) and the gun your looking at has a marginal or insufficient twist rate according to the calcs, then you can make a more educated decision whether other features make it worth the risk.
For me a 1-11 .308 would be fine, because the heaviest bullet id shoot would be a 165 tipped lead core.
A 1-11 .300wm might be a non-starter because id want to shoot vld type 215s-225s, but i might decide to risk it if I liked that particular gun, and depending on what I wanted it for.
Something like a .300PRC and Id demand a 1-8 or 9 to shoot the longest vld 30s. I wouldnt risk it with that chambering because theres no reason for me to use that big a case otherwise.
Environmental changes can also play a roll in deciding what your particular requirements are. I can go from sea level to 9k+ feet of elevation in about an 1.5hrs, and a temperature change of 60+ degrees.
Most of my distance shooting is done at the 9000ft level, most of my sight in and range work is done at 3000ish.
Thats easily enough change that a marginal stability bullet may shoot great one day (and at greater distance) and location, but shotgun pattern on another.
