Chris

As Frank says your 200 yd target may be a snapshot of the bullet right in the transonic zone. The Center of Pressure shifts way forward (imagine a resistance acting on the nose of the bullet) and the bullet sheds an amazing amount of velocity in a very short time because the drag function multiplies by 7 to 10 times. Because the resistance is at the front of the bullet inertia is trying to bring the back end of the bullet to the front. Anyhow it means that bullets wobble as they pass through the transonic and then sort themselves out again on the other side....hopefully.

You can easily check for nutation ( a poor bullet fit causing off axis spin) by shooting the same target at multiple distances. Just adjust your elevation to keep a theoretical center of impact. If you see a pattern emerge that looks like it was drawn by a spirograph then you have nutation

Sorry, I should thanked you guys for the advice.

Thanks very much.

Chris.

That's probably an excellent idea .   

Chris.

Chris 
Yes much less tipping on that one. It seems to make some sense that you needed a bit more velocity. 
Nice target

Sean, there is another Canadian mold maker.  KAL Tool and Die.  They have a web site showing a number of paper patch molds.  I know they'll make other designs as well.  They also sell a case stretching tool.

Chris.