I picked up a used 7400 several years ago that was in good shape and gave 1 to 2 inch groups at 100yds with military 3006 and reloads. However, as the barrel heated the groups moved. I freed the forend, cleaned up the barrel and with full length resized reloads I can get down to 3/4 inch groups at 100yds. The heating problem is reduced but not totally solved. I use 150 gr soft nose bullets over 4350, 414, 4320 powders loaded to about 2600 fps. Mild reloads are all this baby needs to put a deer down with one shot.
best, nrb