I'm a novice shooter myself--but a long symetric line down the case/bullet sounds odd--my question would be does it do it on other brands of ammo/cases as well? Are the hard-cyclings/lines happening from both hand feeds into the chamber as well as the magazine--I'm thinking there may be a problem in the process of stripping the round from the mag and going into the chamber? When you extract there's a sideways torque anyway.
One other thing--I personally never use budget ammo to break-in a new rifle--odds of irregular production stuff causing problems early on go way up IMO.
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