OAL is just the suggested OAL, I find my accuracy improves if I make dummies first just so see where they engage the rifling/force cone. Revolvers easy start big and just keep slipping the dummy into the cylinder tell it fits in just snug then take off 2-3 more thousand. autos just take the spring out and do the same so that way the spring does not mashing the bullet into the rifling, and close her up and find that sweet spot. If for example you have multiple guns same caliber example for me 38spc I checked the difference between the two guns and it was only 2 thousand I just went with the smaller one.
Looks like you found some lead.