So I'm wondering . What would be the thickest string gauge that could fit on my Schecter's stock nut slots . The guitar was set up from the factory with 10-56 . It's a 7 string guitar.

I haven't experimented using thicker string gauges on this guitar yet . But I know once you reach a certain gauge the strings will probably not fit or you can risk damaging the nut . What would be the max for the low B ? That's really the string that I want with the most tension , the rest would be fine for me at 10-46.

Would it be safe to go up to 60 with out any issues ?
It really depends on the individual nut. I have 6-string guitars that needed no filing to handle 52-54 gauge strings, and others that anything over 50 will pop right out of.
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The only way to find out is trying. Unless it's FR locking nut, those can take anything.
Gotta try to find out! If it's a B string that's the 7th string, it should be able to fit - most nut slots are slotted so that it can fit gauges that a bit thicker than the stock, so a .60 should work for you. 

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Widening the nut shouldn't be too big of a dilemma if needed. Going from stock 56 to a 60 isn't that big of a jump, and if it was widened to accommodate, I'm fairly certain you could go back to a 56 without causing too much trouble.

I used to have a 4 string bass that I had in BEAD tuning, and when I switched it back to EADG, it didn't need a nut replacement which shocked me.
Try adding more delay.