Only pointing out other options for lower cost more effective items that can be used in place of .600 nitro,which would also have the draw backs you mention.Also hearing loss is a problem you will run into with pretty much any firearm( yes even the lowly .22 will have adverse effects on ones hearing...

Hey if you are looking for something with lots of stopping power relitivly cheap ammo,more ammo capacity than an elephant gun(up to 10 rounds vs 2 at most for an elephant gun),and a less expensive gun ( Most of your .600 nitro Guns are custom works of art that will set you back A minimum of $10000.0...