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I have a 5-35 SMc which is now available from Savage as a special order chambering. It easily makes 4300 fps, and the designer has gotten 4500. The problem is keeping bullets intact at those speeds, because the rifling weakens the jackets and the spinning force rips them apart inflight.
There aren't yet many makers of .20-caliber bullets, and those are all designed for the 204 Ruger at about 4100 max. They work very well at that speed from the 5-35, but Sierra versions come apart above that. Hornady stays together, but are less accurate than Sierras (when Sierras make it to the target). I haven't shot the Noslers or Barnes Varmint Grenade bullets though it yet. If they stay together, those lightweight VGs might hit 4700.
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