I've used the stock loading gate, and also purchased three other aftermarket types. The pellets catch on the aluminum frame and dent the skirts. Not the gates.
The JTS pellets still rub the frame as the mag rotated, but hardly damage the skirt at all, because they are much harder than my JSB's. And just as accurate! Try squeezing the two pellet types mentioned here between your fingers, you'll see the difference.
Been shooting and smithing airguns for about 55 years. I've never had a desire, or need, to seat my pellets.
Now if I were a competition shooter, I might think differently.
Have fun!