Lawdog,
I have a 30'06 that will sink Sciroccos into one ragged hole at 100 yards, and have tried em in two 7 mags and neither has EVER got better than 1.5" groups, so maybe caliber does matter???or does it???
As far as A-Frame vs. Partition...well I will take the Partition any day...I am biased when Nosler and Partitions are in the picture, but I have shot and hunted with both in different rifles and just always have had better results overall with the Nosler Partition, although if the gun shoots the A-Frame well, it is a true performer on big game.
I know I didn't help any but it is my honest opinion.
Stay Safe. Happy Hunting/Shooting.