what does this target tell the experienced

[chaneylake]

10 inch target, 300 yards, zero wind
elevation 390 ft above sea level

1st round to 10th round, about 20 minutes total time firing on a swag - - - shoot, wipe, shoot till finished

same load as other thread
.40-65, Starline brass, full length resized about 80% of case
.001 neck tension on annealed cases
Jones 422.2 grain bullet, DGL lube
55 grains Swiss 1.5, 0.030 fiber wad
basically no compression
wiping between shots
65 degrees

being a right handed shooter is a slight pull to the right normal?

I do not have a chrony

I have not measured sight radius or site height, what does this tell

what is bc and what does it tell you"