WTM45,
My current 6.5-06 is a pre-64 M70 with a 3.4" mag box.
Shown is a loaded round with a 142 LRAB seated to 3.395
Left to right is ;
1. 140 Berger VLD
2. 142 LRAB
3. 147 ELDM
4. 143 ELDX
This should give a perspective on bullet intrusion into the case, they are lined up even.
The distance to lands of course depends upon throat length