It doesn't really take a PHD to calculate this. You simply need to find the cubic inches of steel to be removed & multiply by the weight of a CuIn of steel. From a nominal bore dia of .730" & going to one of .740" for a pair of 30" bbls I come up with a wt reduction of about 3 1/8 oz.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra