My question is. 3.476 is the length from (col) to the lands. 3.340-- is the col of my gun and the max a shell can be for mag. 0.136 is how far a jump my bullet has to the lands. ( If math is correct) this seems like a lot to me Dose this seem right. I took 2 hours tested and retested colored shell over and over until I found the just and i mean just touching the lands.