possible problem??

[gossy 3]

hi guys.

 

whilst sighting in the rifle today with some new ammo (norma)i noticed that the empty cases had black markings around the neck with sort of streaky lines. i dont no much about this but is this called poor bullet obturation??

 

if yes could this be the new ammo or a problem with the gun (cz 550)?? and what problems is this going to give me if any??

 

thank you in advance for any help

 

gossy

[JonathanL 4]

hi guys.

 

whilst sighting in the rifle today with some new ammo (norma)i noticed that the empty cases had black markings around the neck with sort of streaky lines. i dont no much about this but is this called poor bullet obturation??

 

if yes could this be the new ammo or a problem with the gun (cz 550)?? and what problems is this going to give me if any??

 

thank you in advance for any help

 

gossy

 

If this is confined to the necks only then it probably wont be a problem. Obturation is the name for applying a gas-tight seal so, yes, the neck isn't quite obturating the full length of the brass. It isn't likely to be a big problem it's just a variation within the particular tolerance specs in that particular rifle/ammo combination. You may well find that in another rifle - perhaps one with a tighter chamber, or another type of ammo - perhaps with thinner brass you wouldn't see the neck blackening.

 

J.