AAS400f this is my main gun bought new last year,be lucky if its had tin of pellets through it.its been amazing for accuracy cant fault it.so i bought a tx200 which i use late summer till next spring,just gives aas400 a rest.before i put s400 away i cleaned inside of the barrel using those longish metal rods with furry brush on the end,sure ya know what i mean,3 months later i have a bit plink in back garden with s400 same rws superdome tin of pellets i used before i put gun away as it loves these superdomes,anyways i open tin and pellets have gone dark grey (were silver),its not as accurate as it was before i cleaned barrel,is there nothing to worry about ? could it be cos i cleaned barrel or pellets gone funny colour or combination of both ?.maybe barrel just needs more led through it but that said it was amazing accuracy when i first bought it.any thoughts please lads ?.