Gamo bone collector

Check the usual suspects: stock screws, tissue test the breech seal, have a look at the crown if you can see/get to it. If you have a chrony, get some numbers and see what kinds of numbers you get with those different pellets. Definitely not unheard of to get a bad piston seal from the factory.
Other question would be scope or open sights and if scope, what scope since most factory ones makers include tend to be junk and could be part of why.
 
I have a bone collector I can’t get it to shoot a group for the life of me . I’m shooting at 30 yd & have tried many different pellets & different gr. It’s had in the neighborhood of 700 pellets put through it . It’s been cleaned with the same results. Any help would be greatly appreciated.. Jim
It’s a swarm gen2 bone collector
 
Check the usual suspects: stock screws, tissue test the breech seal, have a look at the crown if you can see/get to it. If you have a chrony, get some numbers and see what kinds of numbers you get with those different pellets. Definitely not unheard of to get a bad piston seal from the factory.
Other question would be scope or open sights and if scope, what scope since most factory ones makers include tend to be junk and could be part of why.
I don’t have a chrony all the screws are tight. I’ve never heard of the tissue test . What is it ? The gun has never been accurate. I’ve tried several scopes on it with very little improvement.
 
Cock, load, close, put a tissue over the breech and fire in a safe direction. If the tissue blows off or or gets a hole blown through it, you have a bad breech seal.
You could also check for built up grease/gunk around the barrel locking wedge. Too much build up throws off how the barrel/breech closes and can throw off accuracy.
Stuff I've mentioned is basic to all guns. Honestly figured someone who's actually owned your rifle would have chimed in by now with more indepth ideas about that exact rifle since the only one I've ever had was an older Bull Whisper I got cheap from a yard sale that ended up having a barrel so bad pellets just fell completely through it.
 
Cock, load, close, put a tissue over the breech and fire in a safe direction. If the tissue blows off or or gets a hole blown through it, you have a bad breech seal.
You could also check for built up grease/gunk around the barrel locking wedge. Too much build up throws off how the barrel/breech closes and can throw off accuracy.
Stuff I've mentioned is basic to all guns. Honestly figured someone who's actually owned your rifle would have chimed in by now with more indepth ideas about that exact rifle since the only one I've ever had was an older Bull Whisper I got cheap from a yard sale that ended up having a barrel so bad pellets just fell completely through it.
Thank you . I’ll give it a try ,