On beersmith, it calculates that for 2.4 volumes of carbonation in a fridge for a 5.5 gallon batch, you should use 2.68oz of corn sugar. 5 oz might give you problems, but I can't say for sure.
2.5 oz of corn sugar at the same temperature as what I just calculated in a 2.5 gallon batch would give you 3.4 volumes of CO2. It's the same as kegging at 21 psi. Seems a little high, I believe most people prefer kegged pressures somewhere between 10 and 15 psi, but more in the 12-14 psi range.
Anyways, there are plenty of calculators and charts around that you can use to estimate what kind of carbonation different amounts of corn sugar will give you. I'm not sure what kind of pressure is required for a bottle bomb though.
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