Only one thing to say to that . . . WOW! You are right Doc I should have said how did you get 513 grains up front, lol. The adapter give u more than I can get, because I dont like adapters, lol. What is a external footing?
And a generally question to all, I have noticed in the past that there is no back, at least to all the inserts I have had. Making a place to thread something into the back. Does someone make a weight that you can screw into the back of the insert to hide inside the shaft?