did some googling and i have come across other people on other forums making reference to the swedish army manual to lube the rounds ..........
from what i can gather this is to make ammo made for the bolt action rifles cycle in the semi auto rifle ......
the short version is the bolt action ammo produced higher pressures ( 160 grain bullet , and slower burning powder ... as opposed to the 140 grain bullet and faster burning powder made for the ag42 ) .
this caused the action to cycle more violently , before the case has had a chance to release it's self from the chamber walls .
the oiling was to help prevent the rim from being ripped off .
again i will mention that taking 20 minutes to make the gas block adjustable like the hakim is the proper fix here . ( would a set by step directions on how to do this with pictures be helpful to some here ? )
below is a link to a article on cartridge pressure standards ......
if i read the one section properly oiling the 303 british round produced 25% MORE backthrust pressure on the bolt .
the 6.5x55 is a similar size and case taper , so i would expect that a oiled 6.5x55 round would produce roughly 25% more backthrust pressure on the bolt .........
http://kwk.us/pressures.html
( near the bottom of the page )
" In Britain, a third set of crusher standards were developed, using a "base" crusher. The crusher was a short, thick tube placed behind a piston at the base of the cartridge, and the firing pin passed through the center. The cartridge case was well oiled before firing, to minimize cling to the chamber walls (if not oiled, the indicated pressures were about 25% lower). To prevent case rupture on set back of the base, the crusher was first deformed in a press to a pressure a bit lower than that expected in firing. The units were generally stated in British long tons per square inch, or tsi "
btw smellie , it was one of your posts a while back , where i first heard about the 303 testing with the oiled rounds and the huge amount of backthrust it placed on the bolt .