Long thread with apologies: I'm running into some frustrations with a Mulcaz sxs back action hammer combo gun in 8x57JRS x 20 gauge and would love to get some collective wisdom. The scope is a Zeiss diavari 2.5 - 10 x 50 on beautiful looking claw bases. I have a separate thread on how this gun was a tack driver last year, grouped very tight at 200 yards and I confidently took an antelope at 300 last year.

I shoot in the field from a "V" gun rest mounted on a tripod from a sitting position. Point is to see how tight a group I can get in field conditions. This has worked well for years, but may be contributing.

I'm generally a decent shot with bolt rifles and recoil with the relatively heavy combo gun and 8x57JRS is a non issue.

The trigger pull could be classified as a bit robust. The set trigger is way too light for me, so I don't use it much if at all.

I wait several minutes between shots, walking to the target @ 100 or 200 yards between shots, and waiting quite a bit after returning.

Took a nasty fall several weeks ago which could be contributing. Boot got stuck under old barbed wire and down I went on a downward slope and cringed heavily when the gun hit the ground and a rock pretty hard. Thankfully the marks on the wood weren't too bad and no visible marks are on the scope.

To summarize what seems to be happening, and admittedly it could be all me:

I'll get a decent group, good group 3" high at 200 and clicked 'down' on the elevation turret the requisite number of clicks. Then subsequent shots are all over the place. This is after the fall.
I'll close to 100 or 80 yards, get an OK group and think everything's OK, then get fliers that are way, way off. Like 6" high or to the left, then maybe a decent group.

Do scopes really lose their zero? I did have a Nikon on a bolt rifle that had all the hallmarks of a scope that wouldn't hold zero and was sent a replacement that's been rock solid.
Could I have knocked something loose?
Not cleaning the barrel enough?
Check the hex bolts on the claw mounts?
Suck it up and use a bench to get a baseline?

Any insight, similar issues, recommendations before I try to send the scope off for a repair attempt? I'm far from the original owner, no warranty. If I need to buy a new Zeiss scope, REALLY hope the 50mm objective will fit in the very spendy existing claw bases!

Thank you for any insight, love this gun and it deserves to be used all year long!