Originally Posted by TXFlyer
This may be a stupid question, but on the surface it's perplexing for a simpleton like me.
Here's the data, an ideas what may be causing this?
300 Weatherby Accumark, same gun, same brass/primers, same powder load, same OAL:
168 gr Berger Classic Hunter (BC .496) = 3125fps
168 gr Nosler BT (BC .490) = 3278fps
I have a theory but tell me what you think.
You are getting more speed because the nosler is creating higher pressure than the Berger.
I highly doubt it is run to the rifling though, but bullet construction. Nosler pills tend to have a pretty stiff base (the old ones before the bt were called "solid base") and often create more pressure than sierra in my 7stw. I suspect it is the same for you with your 30roy.