I recently got a Weihrauch HW97K in .177 which I guess is still breaking in.
Ive had a collection of different old pellets in the cupboard which Ive been testing in the rifle.
At first groupings with all pellets were pretty bad - on par with my Gamo CF-30, but they seem to be tightening up now. An old tin of H&N match and a tin of H&N Baracuda Heavy seem to give the best results.
I had read about how great JSB exact in 8,44 grain are, so I ordered three tins. I was looking forward to incredible accuracy as Im only shooting at 15 meters.
Boy was I shocked!
When I fired those JSB pellets, they were terrible - some shots missed the page at 15 meters. I dont know how this is possible, but what I did notice is that the JSB pellets are incredibly loose inside the barrel/pellet chamber. They almost "fall in" so to speak. I think this might be the issue? All the other brand pellets including the Gamos make a very tight seal in the gun.
The lid on the JSB tin says 4,5mm but the sticker on the bottom of the tin says 4,52 but I honestly dont see how that can be true seeing as how loose the pellets are. They seem to be undersized.
Has anyone else had this experience?
Heres a sample target with my best JSB grouping, the Gamos did really well on this one for some reason but I dont usually get this kind of accuracy from them.