I use a Sinclair front rest and am starting to suspect that the benchrest setup and operation is an important part of getting from 730-740 scores to 750.
- I sometimes find my POA jumps a bit to the right after a shot. Sometimes the POI jumps a bit left, sometimes right when this happens
- I switched from a conventional Protector type rear bag with ears to hold the rear stock to 3D printed bag riders with flat bottoms - one 1" wide the other 4" wide. When put on a flat sandbag, I got less consistency until I added teflon self-adhesive film to the bottom of the rest. Before adding the film, the rider would squeak a bit as I raised/lowered the front rest (which actually also pulls/pushes the gun forward/back). With the film, the squeaks went away and groups improved greatly.
- My bag riders are several inches below the bottom of the stock. I'm thinking about another design where the rider ends up just a couple inches below the bore line, i.e., at about the same height as the forearm rider for the front rest sand bag. With the point of contact so far below the barrel, it seems easy for the action to sway left/right.
Can anyone provide some of the learnings they've come upon from shooting 2 piece rests for USARB? For example,
- How critical is maintaining alignment of the front rest and rear rest? (Folks like Mike Niksch at Thomas who use one piece rests can always maintain alignment; as we pan the target card, our front rest moves)
- Is torque on the front rest caused by the panning a detriment? Would getting a Rodzilla front rest top (that freely rotates), fix this and improve air gun groups?
- Would it help to have the rear bag rider be as high as or above the gun's center of gravity? I see the Thomas benchrest stocks enabling very high rear rests
- Is the shape of the bag rider surface important? What works best? Flat, slight curve, curved v, spoon oval, other?
Am I overlooking other important variables?
Do any front or rear rests seem to greatly outperform others? What are the reasons they provide advantages?
Regards.