I don't know, it's hard to say if .002 difference would matter or not without trying it. However, I’d like to draw your attention to the 50 gr. weights that are available to screw into the back of the regular GT inserts. The inserts themselves weigh about 12 grains, so your total weight of insert plus weight would be about 62 gr., pretty close to what you want. 20 gr. weights are also available, and they can be stacked, so if you wanted something even closer to 50 grains overall, you could stack 2 20 gr. weights and a 12 gr. insert to get about 52 gr. overall weight.