Ditto checking the liner. Try this; run the wire through the liner, do not close the rolls. Grab the wire at either end with a pair of needle nose pliers, and push back and forth through the liner. It should be very easy to feed with a straight gun. Form the cable in a loop and feel the change in force required to feed it, now screw on the front end consumables and feel the difference. Also, check the liner for size. I had tons of trouble with Bernard liners feeding 035 wire, through an 035-052 (iirc) liner. The wire would zig zag inside the liner, and I had major feeding issues for a long time before I figured it out.