harrell...I had mine adjusted before I bought it home from the gunshop in 1980...Except for cleaning and lubricating every few years I haven't messed
with it since...my youngest brother picked up a .270 a few years back used..it was also tang safety...I brought it home with me and mounted a scope that I wasn't using anymore...took it apart and cleaned the bolt, barrel, trigger assembly etc. and just kinda checked it out...used a digital fish scale,trigger was breaking at about 5 pounds...I adjusted to about 3-3.5 pounds...using the allen screw you are talking about...

btw...I remove the barrel and clean the trigger assembly with disc brake cleaner...then lube...You would be suprised at the dirt that can buld up in that area...I do this every other year...every 5-6 years I reseal the stock inside and out.