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The at to hot of a round (1640 fps) and you would be much better off with the CCI mini mags (1235 fps) I have a gsg 22 1911 and mine loves the mini mag https://www.budsgunshop.com/catalog/product_info.php/products_id/63200/CCI+22+Long+Rifle+Mini+Mag+40+Grain+Round+Nose
These will work very well in the GSG David. I use these and the Velocitor and they are just what the doctor ordered : http://www.cci-ammunition.com/products/detail.aspx?use=1&loadNo=0047
I just checked my gsg owners manual an it said standard velocity (1050fps )and high velocity 22 lr ammo(1240 fps) the stinger at hyper velocity at 1640 fps and will batter the action of the gun remember the GSG is a zinc alloy slide and frame; not a heavy steel gun
One will get nowhere close to the "Rifle" velocities listed on these boxes out of a pistol. These are 18inch barrel velocities and the actual velocity spread out of a pistol barrel will be significantly less in a pistol than from a rifle barrel.