I just got a lee 309 diameter170g #309-170f Double Cavity from Lee. I cast the bullets lubersized with gas check and tried to seat the bullets. It appears that when I am chambering the bullets they will not seat to the Leman specs which is 2.52. I can lower the bullet down to 2.33 and they chamber well. I guess my question is that the correct thing to do or is there something else that I am not thinking of. I am new reloading lead but i have reloaded 45 and 44 with no problems. The gun that I am using is the Marlin 336. I can get the 2.52 seated but I really have to press the bullet into the chamber and it leaves these grooves on the bullet if I extract the bullet with out shooting. I am going to see if I can post a picture. Thanks in advance to your responses.