Originally Posted by twiedenh
So today I loaded up 180 gr Accubonds with 76 gr of 4831 and seated the bullet the same as factory Winchester round to get started.
Perhaps you ommitted details... But, that's not load development. That's a shot in the dark.
A common method goes something like this...
Try seating the bullets .010" from the lands. Or, as long as you can while still able to feed cleanly from the magazine.
Then, load 3 rounds each in .5 gr increments from near min to book max load.
Allow the barrel to cool sufficently between shots and/or groups.
Verify that you're not flattening primers, marking the case head with the ejector, sticky bolt lift or other signs of excess pressure.
Choose the best group or two and load 5 rounds each to confirm that you repeat similar performance.
Then, stick with that powder charge and load 24 rounds with 3 rounds each varying seating depth by .005" step sizes. One or more of those groups should yield good results.
Confirm your final load with additional groups.
Chrony everything if possible and confirm actual trajectory/drops at various distances to confirm/compare against your ballistics software.