Thread: 6.5mm-06 Loads Advice

Greetings All,
I got to the end of my search for a load for my friends 6.5mm-06. After starting with AR2217 and experiencing very low velocities the likely charge needed was calculated which would not fit so it was back to AR2213SC. Previously with 140 grain Interlock projectiles the rifle has needed 2 additional grains of powder to reach Hodgdon or Nosler book velocity so 52 (Nosler max) and 53 grains were tried with 129 grain Interlocks. 2,744 and 2,787fps, a little less than expected. The 129 grain Nosler LRAB are harder than the Hornady and more velocity was expected and was delivered at 2,873 fps, or about the Hodgdons max for the 130 grain AB. More could likely be extracted but this will do for now.
So the question remains. Why is the chronographed data for this rifle so far below both the Hodgdons and Nosler book data? Previous testing in a 6.5x55mm has shown velocities for AR2213SC to be in line with the data and lot tests have revealed no significant changes in speed. Some data from the 80's gives a clue. This shows some data more in line with what I am finding.
So here is my theory. Up until the mid 90's Americans hated anything in 6.5mm (and 8mm) calibre with a passion. This all came crashing down when a certain cartridge appeared in 6.5mm. This unlocked the door and many followed including the previous wildcat the 6.5mm-06. The continentals developed rifling systems to suit the long 6.5mm projectiles with deeper grooves to keep pressure down. In the US tighter bores ruled and these were applied to the 6.5mm-06 when domesticated by A2 around 2,000 before it crashed a few years later. My friends rifle was rebarrelled in the mid 90's. Somewhere in my stacks of old Handloader mags I remember some load data for the 6.5 x 64 Brenneke (6.5mm-.270). Perhaps I should look them up.
Regards Grandpamac.