I am new to this site and have a question. Do you want to apply rearward pressure AND load the bipod or apply rearward pressure OR load the bipod?
I found a Sniper's Hide video that suggests applying the same amount of rearward pressure in pounds as the rifle weight. My rifle with bipod weighs 14.5#, so I tried picking up a 15# dumbbell before building my shooting position, but it hasn't worked well for me yet.
I tend to shoot much better if I relax and apply light rearward pressure if any when both shooting prone and off the bench. I apply just enough rearward pressure to keep the rifle from bouncing off my shoulder during recoil. It's almost as if I get behind the rifle and use what I would describe as using a free recoil technique. Sub 1-1/2" groups at 300 yards are common using this technique, but I know the rifle will do better. Applying more pressure increases my sight wobble.
I square up behind the rifle, so the muzzle doesn't move laterally during recoil which works really well. I just don't have the rearward pressure or bipod loading mastered yet.
This old iron sight rifle shooter needs a little help.