Making progress.......when I first read you were going to use 18 gr pellets, I was going to suggest the 14.3 JSB or Crosman Premier.
My .20 shot that CP 14.3 great. You don't need much anything else when you get a supply of those, and your gun likes them.
What the guys said above is correct.......Too heavy or light on pellets, not so good on the gun, or shootability/shot cycle.
Also, yes, a soft towel or in the hand is often best vs off bags using a springer.
