If you think the bullet is hitting the lands, then there should be a mark on the bullet to show this.
You say you are checking the COL, what you should be checking is the Ojive of the bullet to the base of the case.
By checking it this way, you will know how far from the lands that the bullet is seated.
Nothing will be very accurate, if you go from the tip of bullet and measure (which is COL)
If the rounds are hard to chamber it can be three things:
The bullets are seated "off center" to the casing and bumping into the barrel.
The bullets are seated "out" to far.
Casing not "sized down" far enough.
I had a 06 one time that 8 shells out of 20 that I loaded, would not fit into the chamber. Reason was, the bullets were "out of alignment" in the case by 8 thousands. So being I had them seated to .020 off the lands, they were hitting the side of the barrel and not allowing the round to chamber. So this is something you may want to look into.
Hope this helps.
Last edited by glassman; 03-15-2008 at 12:57 PM.