Ok so when I workout my biceps, I have to hit them with a 10-12 rep range in order to get a pump. When I do rep ranges of 6-8 I don't get a pump or at least not anything close to the 10-12 range. I guess I have this conception that the bigger the pump the more growth? Is there merit to that? I do understand hypertrophy occurs in the 6-8 range but does the pump in the 10-12 range have anything to do with growth or the lack of a pump in the 6-8 have anything to do with lack of growth?