I can't answer your question on the 250K, but I have a Mission drilled Pin under RF (50* x 4 x 70*) for the medium to medium heavy oil that I bowl on and a Game On drilled Pin under RF (50* x 4 1/4 x 70*) for the medium to medium-light oil that I bowl on and they both work great on those conditions for me and my style. Don't know if this helps or not.
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"Whenever I feel the urge to exercise I lie down until the feeling passes away."
Brick