... Starline is a good brand ... the striations look superficial ... my first reloadings of these cases would be modestly powered loadsEmail them that picture and ask them if the cartridges are defective or if this is normal and it is safe to fire. I have never seen new brass look like that. IF it is safe to fire THEN I would inspect it for cracks afterwards. Personally I will NOT knowingly reload any casing with mouth splits.