Could be any of a number of reason why your not getting a full size. I don't think thats your prob, I think its either a OAL issue or a crimp issuse.
you say your ok with OAL. is that OAL in general or for the bullet? Diffrent types of bullets have diffrent OAL specs.
assuming you are correct about it not being a OAL issuse. back your crimp off a 1/4 turn, load a dummy, try it. repeat until it fits in your barrel. then load 5 live rounds and try it in the gun.