The checks are a perfect snap-fit on these bullets. First I use a Lee push-through .225" die to install the checks and pre-size, then powder coat, then nose-first size in a bump die I made, CBA-style. I also made an ejector that fits the nose profile and acts as a positive stop, and made a flat-face top punch that rides down in the die to bump the base square at the same time it's re-forming the nose. Should be square, but I it's hard to check that unless I sand off the pc, which I do before nose-forming. If I work up a load with buffer it should eliminate base imperfections as a cause of my flyers.