The point of a shooting rest is to remove the shooter as a variable. When a rifle will not group, there are three possible causes — the rifle, the ammunition, or you — and until you eliminate the third one you cannot diagnose the other two.
The two approaches: a one-piece rest that you set the rifle into and shoot from, which is fast and stable and offers no fine adjustment, or a front and rear bag setup where you squeeze the rear bag to change elevation, which is what benchrest shooters use and requires technique.
For sighting in and general bench work, a one-piece rest is simpler and better. For load development where you are chasing quarter-inch differences, the bag setup or a mechanically adjustable rest gives you the control you need.
Getting real information from a bench session
Support the forend, never the barrel
The barrel vibrates in a repeatable pattern with each shot, and that pattern determines where the bullet leaves. Resting the barrel on anything changes the pattern and changes your point of impact. Support the forend, ahead of the magazine well and behind the sling stud.
Load the bipod or the bag consistently
If you push forward into a bipod or a front bag, do it the same amount every shot. Inconsistent forward pressure is one of the most common causes of vertical stringing, and it looks exactly like an ammunition problem.
Let the rifle recoil
Gripping hard to control recoil introduces a different input every shot. Consistent light contact produces smaller groups than a firm hold, which is counterintuitive and is why benchrest technique looks so relaxed.
Let the barrel cool
A hot barrel walks. Three-shot groups with a few minutes between them tell you far more about a rifle than a ten-shot string fired as fast as you can work the bolt.
What a rest cannot fix
Loose scope rings, a loose action screw, an inconsistent hold or bad ammunition. Check the torque on your rings and action screws before you conclude the rifle does not shoot — the number of "inaccurate" rifles that were a loose ring screw is very high.
How these were picked
I haven't handled these. Here's what I did instead.
Everyone in this category says they tested twenty of these. I haven't tested any, and I say so. What I do instead: read the manufacturer's manual and published specification, compile the numbers that decide the purchase, do the arithmetic in the open, check the live price, and name one product to skip. The scores above are judgments from that research against a published rubric — they are not measurements I took, because I do not have a lab and I am not going to pretend otherwise.
