it wouldn't surprize me if the 12 was on the hairy edge of stability with the 85-87 bullets.i'll bet a 10 or 11 might shoot them more accurately.an example would be the 58's are shooting half inch.might just be the bullet, but it might just be a stabilization issue
I wouldn't think that it's twist causing your inaccuracy. Unstable bullets tumble immediately. They won't stay on 8x12 paper @50yds. Maybe your just moving further from an accurate barrel node with heavier bullets and slower velocity?
Thats not totaly true Mikecr , I have seen 75gr A-max bullets shot out of a 1-10 Encore in 22-250 that would group around 3" at 100yds but 90% of the bullet hole were percect sidways cuts and the other 10% being very elongated holes. I have also see guns shoot bullets into 2" oblong holed groups at 100yds and then shoot the same load into 2" groups with perfect bullet hole at 200yds.
On another note if you notice that the 87gr bullets is only slightly longer than the 85 but the ogive on the 87 is noticably longer and more streamlined.
IMO, how hollow is the hollow point makes all the difference in the world! A bullet with lead sticking out but the same shape as a hollow point will normally be more stable. Put tungsten in the nose of a bullet and you will need almost no twist at all, it is the fact that the heavier tail section wants to overtake the lighter front half of the bullet.
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