Hi all... I'm new to reloading rifle but not pistol and am about to reload my first .270 Win cartridges, I have Sierra #1820 130 gr Game King, Sierra #1830 130 gr Pro Hunter and Nosler 130 gr Ballistic Tip that I'd like to compare out of my Model 70 but am having a heck of a time trying to figure out if I should use the COL listed in my manuals or measure off of the lands and exactly just *how* to measure off the lands. I've read so many different methods that my brain is now totally confused and have ordered the Hornady Lock'N Load COL gauge along with the Comparator set but they will not be delivered until late next week and I'd really like to hit the range tomorrow since I somehow managed to sneak a weekday off. So.... I found a fired case that held just the right amount of tension to hold the bullets loosely and stuck the bullet into the case mouth so that the bullets were very long, chambered the rounds and gently pulled the cartridge back out and measured. I did this 15 different times using 15 different bullets from each bullet type (yes 45 times!) and averaged the COL of those 15 cartridges and then deducted .010 for my starting COL. After going through this procedure I read more info and now I am at odds to use these COLs or just start with the data in my manuals? Thanks.