Josmison,
I'm not sure want square you're trying to fill. The regs say:
"(4) 250 hours of flight time in an airplane as a pilot in command, or as second in command performing the duties of pilot in command while under the supervision of a pilot in command, or any combination thereof, which includes at least—
(i) 100 hours of cross-country flight time; and
(ii) 25 hours of night flight time."
So you can count the SIC time to meet the 250 hours PIC.
"(c) A commercial pilot may credit the following second-in-command flight time or flight-engineer flight time toward the 1,500 hours of total time as a pilot required by paragraph (a) of this section:
(1) Second-in-command time, provided the time is acquired in an airplane—
(i) Required to have more than one pilot flight crewmember by the airplane's flight manual, type certificate, or the regulations under which the flight is being conducted;
(ii) Engaged in operations under subpart K of part 91, part 121, or part 135 of this chapter for which a second in command is required; or
(iii) That is required by the operating rules of this chapter to have more than one pilot flight crewmember."
So were the 700 hours flown under 121?