Just for kicks and giggles I loaded up some Cast Performance 395 gr. hard cast gas checked bullets.
I used 30 grains of Accurate 1680.
On my first shot I had a huge fireball, sounded funny, and my friend said you could almost watch the bullet going downrange.
My 2nd, and 3rd shot sounded better with little muzzle flash.
My 4th shot was like the first, and the 5th shot was like the 2nd and 3rd.
What would cause such a difference in the muzzle flash, and velocity.
I don't have a chroney, but could tell by the sound there was a difference in the shots.
I have been reloading for 30 years and measured the powder with a scale on each load.
I also loaded up some 350 gr Hornady jacket soft points at the same time using the same load and they all shot fine.