Varmint knockers and bbt

I got curious about cutting a 3/32 x in the nose of the varmint knockers 33 grain and the new 36 grain bbt hp Rick Morrill sent me. On the left is the standard unmodified bullet while next to it is the bullet with an x cut into the nose. Shot at 940 fps out of my modded armada into a 5 gallon bucket of water. Quite a difference
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If those cuts in the nose aren't perfectly concentric, your accuracy will suffer GREATLY! I realize the benefit just from looking at the picture. And within 35-40 yards, the accuracy issues would be minimal. But long range accuracy could potentially be garbage if the modifications to the nose weren't concentric. 

Do those slugs come with that modification, or did you do that yourself? If they came modified, them more than likely there's a concentric modification inside of the swagging dye, and the accuracy issue would be absent or negligible. 
 
I agree totally about the accuracy issue. My thought was to see the results, then I’ll build a jig for it. I’ll test them this coming weekend for accuracy if I don’t get rained out. I’m thinking under 50 yards they will be devastating. The varmint knockers I’ve shot 20 in a quarter sized group @ 90 yards. That was on 2 fills. I just received the bbt so no accuracy testing yet out of my armada.