I have a near 20 year old FP110 in .25-06, generic trigger job, lightened to about 2#, smoothed. Best repeatable group is about a third of an inch center to center at 100 yards, with 120gr Partitions and VV N140 or something like that- whatever fills the cartridge without powder compression, at max OAL. 3300fps at 10 yards, way more than i'll ever be able to do in the field, but when i can settle down and i know the distance, wow. Granted, i've let more than half my shots walk away, but good shot makes up for that bitter taste. Pretty bohemian, i guess, $400 rifle, $400 smithing, $600 scope, $500 range finder and an $100 o-ring press & dies.
Seems the key to consistent accuracy is getting the case nearly full with powder- choose a slower burning version for more volume- whatever you use. fill to 100% case volume for your seating depth (takes time to compute- but worth it) - 10 year old loads the same as yesterday's.
I originally got the .25-06 thinking if i shot it out, i could have it rebored to 6mm, .270, etc... hah! never shoot it enough. buddy got me into the quarter bore with his .257 roberts, great gun, great round. the .25-06 is too heavy for the power to work as a true field gun, but if you see a target, and it is less than 400 yds, odds are you'll get it.
love the -06 case- i can find and size brass anywhere, 120gr has always done the job for me, and 60gr flat points come out well over 4000 fps- still less than 1 moa at 100 yds, and basically vaporize anything they hit- a little overkill, but close to an 'everything' round as i have- .25-06, if ever i need more, it will be close up with a .729 bore. So to speak. :-/
j