I would for sure believe in that rifle's consistent cold bore and follow up shots. I have a Browning 7mm Mag that will shoot the same dead center bulls eye at 200yd with the 1st cold bore shot. The 2nd round will ALWAYS be 2" to the right. Third shot is 3" to the right. Much like yours Rumbler. Very weird. But consistent. It has done this since 1994 when I bought it.