Nice rig and a swift to boot a man after my own heart, it is very hard to build velocity and get good FPS with a 7 twist barrel, there is another member with a with a 22-250 and a was saying the same thing how his numbers were way off the data, it shot well but was down on FPS, you might want to try some Win 780 or RL22, you will need to use all available space in that case to extract the numbers you want.
Dean
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