Webley Osprey ST weird flyers

[hwtyger]

Tap itself isnt clipping the pellets. They drop in deep by themselves. No need for seating but tnx.
Will try a chrono

[trajectory]

Sounds a strange issue & one to which I don't know the answer.

Since the first shots impact away rom the point of aim in a random fashion does this suggest it might not be a power consistency issue? Wouldn't a small varriation in power just produce a degree of vertical stringing? A large degree of varriation might not stabilize the pellet & give varrying points of impact but wouldnt that be discernible in use. A small varriation in power might give rise go vertical stringing but at 6 yards I think it would be fractions of an inch. As I say, don't know thw answer but the results of ghe first few shots of a chronograph might be interesting. It does sound like something is settling down after a few shots...

[series2a]

Same problem tried everything. Did my head in. Sold in the end It was as new so wasn’t a wear issue, also sounded like a Russian tank engine starting up. Nice looking but odd concept obviously didn’t sell well so probably there’s your answer.

[averageplinker]

If it is not the piston seal could it be a trigger issue? Perhaps solidified grease make the trigger awkward/sticky until a few shots loosen it up?
Rich.

[bill57]

Is the plastic loading tap lever in perfect condition and completely tight? We tend to think of pellet clipping as being a side-to-side issue, but if the tap lever has any play at all then you can get variation in tap closure which will cause up-down clipping.

As you say, clipping would be more likely to cause inaccuracy with every shot, but this is only true of lateral clipping. Variations in tap closure could be much more random. Shoot pellets into a rolled up towel at twenty yards and examine them, you'll soon find out if they're clipping.

[hwtyger]

Ill look at the tap, thnx.
Dont think its a problem related to the design of the Osprey itself, as my other Osprey doesnt have this issue, andmy Tracker, which has similar design doesnt have it either. (nor do my MK3s with also taploader design). I also doubt Webley wouldve picked a faulty one for their museum collection.
Wish I could give Steve P an email and ask if he knows... He knew a lot about the Webleys as they were at the same place..
Maybe its easiest to rule out myself first. If it dóenst have these issues when I shoot rested, than its me after all

[bill57]

Always, always suspect the tap in an Osprey. When set up well they're really accurate guns and not prone to fliers, but the tap is the weak point. The moulded plastic lever controls the closure of the tap, and has to be a perfect tight fit in the recess in the metal tap body. Any slop at at all and you're in trouble.

I have always found JSB to be too loose a fit for an Osprey, but RWS Superdome (.177) perform very well. Might be worth a try?