I just got done putting my 22BR together. With the fire forming with freshly turned necks I got excellent results with....

Sierra 53gr
AA-2015 28.0gr
Lapua 6BR brass

This was just in the middle of fire forming some brass with some different powder combinations. I was amazed at the accuracy at this stage. I tried from 27.5 to 28,5 in .5 increments. The worse group was .774" but the middle load of 28.0 shot a 5-shot .213". I only had 5 in that load but I will get back out and work around that with seating depths now.
Benchmark also did well in this gun. The best of those was a .278" 4-shot group.
This is with a Savage action and a Douglas barrel...
tootalloutdoors