Finally got a test lot loaded and headed to the range. Only powder I could find was IMR7828. Picked up some Nosler 150gr BTips...which have alway shot great in my 7mag. The best group I got (loads went in half grain increments from 63.5 to 67.5) was at 65.5grains. At 100yds, the group was .435" or .415MOA. I seated the bullet 0.020" off the lands/grooves.
I also did the same thing with my Dad's 7mag. Same lot, same bullet, same test. His best group was at 66.5grains - .466" group.
I am using an old Nosler book - #3. Used their recipe. I don't know velocity yet but I can assume for the moment that it's somewhere in the 3050 to 3100 range for both.
Next Question....it's a hunting round, but should I experiment with seating depth? say load up 5 rounds a piece at 0.010 - 0.040" off the rifling to see if accuracy improves? We also had a fairly good group for both rifles at 64.5grains (chamber length on both rifles is .001 apart - which would allow both rifles to technically fit and seat the same round). Looking for advice from the grizzled veterans of reloading here. Pretty proud with the results so far, but would like to shoot a dime instead of a nickel.