Nate it is a 28 1/2" Hart no brake.
A friend came over tonight to look at this rifle. He guides Elk hunts and has never shot at extended distances. We took it out to my driveway and I have a steel target with a 12" circle and a 2 1/2" orange dot centered in it. The target is at exactly 1171 yards. Remember I have a temporary scope on the rifle while one is being repaired. The scope on it now is a 2.5-10 x 42 IOR tactical with MP-8 dot reticle. We dialed up 25 moa and I let one fly. Clank!
Then he took the wheel... Clank, then me , then him again. With only 10 power you have to work to center the mp-8 dot on the target at 1171 yards. We drove up to the target and 3 were in a 6" group and the 4th took the group to an outside measurement of 12". Plus we had some light wind. I can't wait to get a bigger scope on this rifle as I am pretty sure it will hold 1/2 moa to 1200 and that works for me. Meanwhile, I will get the rest of my drops and trajectory validations done and get a velocity figure.
One other note, I am not sure why, but these 180's are hitting the plate hard. They blew through it at 500 and almost went through at 827. They dented the 1/2" plate at 1171 twice as much as a 300 win with 210 bergers. So it must be the velocity and it must be retaining it well.