Here is an update:
Windy about 5 - 10 MPH right to left. Cold about 26 degrees. I was breaking in the barrel and trying to get some readings on some loads.
I was using Benchmark, new Military cases, Remington 7 1/2 primers seated out to just kiss the lands. I used the data in Nolser 5th edition. I started with 26.0 grains and some loaded up with 27.0 grains and then some with 28.0 grains of Benchmark.
I was not shooting well because of the cold and my rest was a little more unsteady than I like (watery eyes do not help either). I had a new set up for my range and haven't sorted it all out yet.
Here is the last group I shot with 28.0 grains
I know I pulled the one shot and like I said the rest was wobbly left to right (a lobed bag stacked on top of 3 sand bags just does not cut it). I also did not have any more loaded up. Only enough for 2 - 5 shot strings...Shows some promise.
Here is the last group of 5 with 26.0 grains
Not too bad either, but another flier.
I think I can tighten these up some more (the fliers); not too bad for a 10X scope and my first loads tried
Average for the 26.0 grains is 3575 fps (last five shots); for the 28.0 grains 3858 fps (last five shots). Just 2 fps slower than Noslers book value (3680 fps); I think I found my top load - will it be accurate enough?
BTW I was doing a lot of cleaning on the way to help break in the barrel. The last two groups (shown in order) were with 5 shots down the tube and no cleaning before or during the last 2 groups. The jury is still out if it will like a dirty barrel or a clean one; but it looks like a dirty barrel is going to prevail. I shot a total of 36 rounds today, just enough to get it some what zeroed and do some velocity/grouping testing.