I know this, I have a 30" kreiger 8 twist senduro contour on my 6.5 gibbs, If I shoot the orange box bergers this is what I get
that's the entrance, I kept reading great reports from folks on the orange box hunting bergers, but every deer I shot with them, just had a splash wound,I finaly talked with brian litz, after seeing my pictures he suggested I try the yellow box due to me having a fast twist cut rifled barrel was somehow compromising thinner jackets, when I use the yellow box match bullets, I get exactly the same results as most guys get with the orange box, no use debating it, it is what it is.
RR