I've heard of guys using 85% to 90%. As long as you can speak to it and explain how you arrived at that number. Half my mil time was flown with copilots (50% of primary time), and the other half, I would take the A-code about half the time (25% of primary time). So, I used 75%.
I know of a C-130 guy that claimed 100% of primary time as PIC and got hired, but you don't want the interviewer to question your integrity. YMMV.
How many hours do you have?