Originally Posted by
Wayspr
Trying to find a problem like this is a process of elimination. Here's the steps I would take in your situation:
1) give the barrel a good cleaning to remove all copper
2) pull the scope and remount to eliminate a mounting issue
3) pull barrelled action from stock and reseat to proper torque settings
4) patiently try several factory loads waiting between shots for barrel to cool
5) swap scope with one that you know is working correctly
6) replace the nut behind the trigger
After we have eliminated the above easy and obvious, then and only then would I start working on the hardware of the rifle. Since the barrel and trigger have been swapped, I'd bed the action and make sure the barrel is floated. If she still doesn't shoot, time to either bring her to a quality smith or get rid of it.
All excellent suggestions Wayspr...I would also add...if this is a new barrel, completing a methodical barrel break in may be necessary...not all rifles require this to be accurate, but many do.
Here is one of many recommended break in procedures, and the one I use most often.
http://www.larrywillis.com/Barrel.html