Originally Posted by skip a stone
DoubleTap does indeed use GoldDot ammo. Because of two different types of GoldDot bullets being made (one shallow and one deep) has led some people to suspect that they aren't getting the genuine article, they are.
As far as bullet setback goes, if you own a 357 Sig take a mag full of Speer GoldDots measure them with a set of quality calipers and then cycle them through your weapon like I did when I wanted to test a new extractor I had recently replaced. Now measure them and see how they compare to your original measurements. It is beyond me why someone would disbelieve that a round like the 357 Sig with that tiny little bit of brass holding the actual bullet in place couldn't possibly have bullet setback problems.
I have not measured any but I might have to try that and see what happens.
GLOCK,Its better to have it and not need it than to need it and not have it.