If that first shot was a clean barrel, disregard it. I always foul my barrel before anything counts.
You should slug your barrel and measure. Somewhere in the .503 area looks like. Then again, looks like you found your combo.
One thing I see lots of people do is not measure there barrel (slug it). I find you need that measurement first before you just buy just any bullet. No sense buying a small bullet in a large barrel...ect.
Next, some people like to push full bore conicals too fast. I didn't see where you mentioned powder and amount? But that is some fine shooting! Good job!!!
