Ok, new to reloading and hitting a few dilemmas. Trying to load 110gr Hornady V-MAx 0.020 off the lands in my .270 R61 SAKO. Measured the COL bullet to the lands and it averages 3.200( got from 3.213 to 3.198) SO, wanting to set the bullet .020 off the lands I should set the COL to 3.180. Hornady book says COL is 3.164. Any problems there seating over the book, which I assume is SAAMI generics and not specific guns? Second, seating to the above depths won't get the 110gr down to the canulure. Is that a problem, by not crimping on the canulure(?) or do I have to seat way off the lands to the canulure. Finally, a side reason I ask all this is the once fired brass I'm using is from 2 different manufactures and EVERY one of the cases were burned/discolored at the case mouth and after 12 hours of tumbling and even some steel wool "elbow grease" couldn't get it all clean. All the factory ammo is measured at the 3.16 COL range. Could the burned case mouths be from the bullet being so short of the lands. THanks in advance!! HOpe I have all the pertinent info in there!