Dick;
I absolutely believe your results. Had I seen them on 20/20 I likely would "NOT" have. I lost total confidence in it & all similar shows years ago, as nothing but "Headline/Rating" seekers. It is known fact they have not always aired reliable results.
Ted;
Prior to having that work done, do a statistically signicicant chronograph test for velocity on the shells you are & will be using. Have enough of them to run a like test after the work is accomplished. I will state up front, "IF" you do not get a significant change of ballistics you will likewise not get a "Feelable" change of recoil.

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