Re: seating depth for 6mm 107 gr MK
If you cannot touch the lands with a MK, then no VLD will be even close to that.
A good knowledgable LR/1K gunsmith will throat for the type of bullet you are going to shoot. If you cannot touch on a MK, I doubt you will find anything that will touch. Only fix is rechamber with shorter throat by a different smith.
Take two stoney point ogive checkers $40 that clip to caliper blades and measure the length of bearing surface on a MK and a VLD like a Berger or JLK. On my 6.5 the JLK is .112 shorter, which means I have to seat the JLK .112 out further in the neck to touch the lands. Plus most VLDs like to be well into the lands as much as .020-.030 while the MK tends to like just touching.