I've been wanting to learn some Deftones and Machine Head riffs in drop-B tuning, but I've never tried tuning my guitar below D before. I know that Stef Carpenter from the Deftones uses a seven string, and I think the Machine Head guys use 6-strings with really heavy string gauges. However, I have only a 6-string with an average string gauge. Do you think it would be "safe" (for want of a better word) for me to tune down to B?