While Cape Air SIC's can certainly log the time, be aware that they only hire a small number of SIC's... they are mostly there for the times the autopilot is out of service or for low-time Captains. They aren't going to want to hire hundreds of them and take seats away from paying passengers. (Yes, a passenger usually sits in the right seat). Also, they aren't going to hire somebody with 250 hours and have them ride around as a glorified non-rev for years getting up to 1500 hours. Realistically, last I checked, 1000 hours or so was the min and 1200 or so was competitive. They want you to upgrade to Captain before you burn out on the F/O program.