You should see slow motion from prone-position right behind a heavy duty sniper rifle. The kind that shoot bullets going Mach3. The shockwave is this needle-like corkscrew of distorted air.
Are those... targets getting knocked down in the last one? Yikes.
Also, the trees behind the firing range are going be noticably free of birds.
Also, Sosage, I have an old Item Backpack I'm not using and could sell to you at three quarters price, if you want a cheap 8-slotter.