Anyone use one? Buddy has one on his .300 RUM that I've formed a few rounds throught. Currently building my own RUM for longer range and am debating going with one Pros/Cons?

"Life is not a journey to the grave with the intention of arriving safely in a well preserved body, but rather to skid in broadside, used up, worn out, bottle of Jim Beam in one hand and a .45 in the other, loudly proclaiming WOW-- What a Ride!"