I just ordered myself a hatsan flash .25. It's my first pcp air rifle and I'm looking at the wide variety of .25 caliber pellets. I'm finding pellets that range 20 grains to 60 grains. My main question is are all these types of pellets safe to shoot out of this gun? Not as concerned with accuracy as I'm not planning on doing any competition sniping. I just want something that won't ruin the gun. Over time I can figure which pellet suits my use. For now I'm more interested in the high grain hollow points to smash some targets.