Today I shot a ladder using 2 shells in each charge. This method usually works best for me. I started off with 68,68.5, 69, 69.5, 70, 70.5g and 180g nbt. Winchester cases wlr primers. I had read a few articles using standard primers getting better groups other wise I use magnum primers. Results were fair at best ladder grouping was about 1.5 moa. @200 yds...no noticeable nodes. A few of the like charges would measure .5 moa. But no noticeable nodes. One thing stuck out to me while shooting this ladder. The velocities had large spreads even in like charges ( as much as 68 fps) in one pairing. I also understand this could b factored by firmness in shouldering rifle and chrono error. But seems extreme for this powder. Do you think this is caused by poor ignition from standard primer? Should I give this ladder another go with Magnum primer? Might explain random groupings. Gun has shot much better with H-1000 and Magnum primers, was just looking for great group and more velocity. Gun is mostly stock Tikka T3 lite 24 3/8" barrel so keeping it at max mag length for repeater. My lightweight rig.