MDT, I buy 2 ea two pound bags as Sam's club (Sunmaid red raisins) and I used about a pound for a 5-6 gallon batch. I also pulse them in a food processor before adding them and, so far, I have only used them in primary fermentation. I really like Joe's idea of using them in secondary, makes a lot of sense and I plan to use his method in my next red.
Never give up! Christopher Columbus never gave up. Benjamin Franklin never gave up. Oliver Twiddledee... (Who's he?!) You see, you don't know because he gave up!