Usually, due to the difference between the final drive gear ratios between the Suzuki 250 and 300, you can run the same prop on a 300 that a 250 would use on the same hull. I'd ask Kmoose what prop he's running and try one. I would guess your rig should top out around 45-46K (52-53 mph) when run light.
For example, with a GR of 2:29, a DF 250 will have a prop RPM of 1965 at an engine speed of 4500 RPM. A DF300 with a GR of 2:08 will have a prop RPM of 2163 at the same 4500 engine RPM. So a DF 300 is spinning an identical prop roughly 10% more RPM at any given engine RPM compared to a DF250..
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