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NSA 43.5gr and 55.5 slugs Impact

Nope, that's about 80 FPE and the longest slugs that will fit in the magazine. I can use them in the mag but normally shoot from my single shot tray for consistency. If you read further down the thread you can see what I did to the Impact for it to shoot that power. As is with the lighter valve spring and higher power at about 135 bar, it only gets about 35 shots per 250 bar fill. If I wanted heavier I would have shifted to .30 caliber and shot 65 grain slugs, but as you may already know, the higher up in power you go the harder the gun is to shoot and the harder it is to harmonically tune. As is its very powerful and accurate. I call it my air powered .22 LR Rimfire... ;)