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I was stunned at the POI changes when I used a Lead Sled. My rifle groups would do very weird things and open up a lot so I only do sand bags for sighting in or developing loads now.
Maybe some sort of harmonics thing?
A couple groups. Well three. 5 shot groups. Shot off a rest and rear bag. .300 RUM pushing a 200 grain Accubond 3200 fps. Rifle weighs about 8 pounds all up with sling and 4 rounds in it. No brake so it has a little snort to it. These are zero checks before season. No sled required. Kills elk dead. mtmuley
Wow muley, great shooting. You almost hit that dime every time !! Keep trying. Just kidding- those are great groups, and looks like you found a load your rifle likes.