Originally Posted by sc928porsche
Unless things have changed, the 22 Earsplittenloudenboomer was the fastest 22 cartridge made. It was made to see if they could get the majic 5000 fps mark.
Usually when someone says "ever made", the context implies a quantity. Not a one-off, custom item. If every one off custom were counted, it would be pretty impossible to ever say anything was best/fastest/biggest since we'd never even know what we'd never heard of.