No, what did the .015 patches look like before the buffer, it sounds like the original groups were poor because of thin patching and changing to .018 straighten things up...

I couldnt find any of the .015 patches when i was just shooting those alone. My range is in thick oak brush littered with god only knows how many years worth of leaves and dead branches on the ground.

I too believe the .015's were to thin, but added the buffer patch really helped out a lot.