Yo dude,
just my 10 cents here
I have most sniper rifles and i gotta say as far as stealth goes, my tanaka's are the way. as far as consistency goes, i'd highly recommend tapping a mag and running HPA
mine makes 490 on 25psi with the stock bolt and a palmers negative pressure stabiliser.
i use the Ogre line from my P* and dont even notice its there.
on the note of lines and realism, i hate to say it, but its still only a toy gun haha so whats the harm
*ducks for cover*
Hope this helps