They shouldn't be anywhere near as loud as a 30-06 stock. Is it the stock barrel that came with it?
Making it low pressure and getting a barrel that's a little longer and has less porting will make it quieter (Don't go over 14 inches though). Like opteron said, a JJ ceramic is a great barrel for the price, and they're pretty easy to find. Making it low pressure is kind of expensive and not really worth it on a victor. If you want a low pressure spyder, they can be had for way less than $100 used if you look hard enough. Look for an RS, RSX, VS2, VS3, electra 08 or newer.
Waiting for warmer temperatures...