I'm not sure what you are looking for, but here's some similar, but slightly different. Notice the left hand postion on the forestock. LB's is close to the lock panel, however hatchet Jack's is further out and Neil's is further out yet. My own left hand grip is at the entry-pipe, with my forefinger running down the pipe, straight toward the muzzle. I find this reduces left and right movement so concentration is mainly vertical. I've been shooting this way since the 70's. Too, I don't hold me elbow as high, due to a shoulder injury from some large centrefires, so my elbow is dropped. I got used to shooting that way over the last year and a bit, so still shoot that way - sort-of- it's about 1/2 way to what is deamed to be the proper postion.
Here's Jody - feet slightly addressed to the right, body swung to the left slightly, sort-of Swiss Style, elbow about level with shoulder, slight drop, shooting a 10 1/2 pound .58 full stocked Hawken, her mothers.
Here's LeatherBelly, feet addressed to the target, elbow level, in recoil form his Frenchy 20 bore.
Here's Neil H. with elbow just slightly low - happens with age - HA! Neil is tough to beat, shooting his wife's .40 flinter.
Hachet Jack - wide foot stance, slightly left of taget - looks uncomfortable, but steady.