H-335 can make a bit more noise, and has some flash in some other loadings. I loaded some with 110 grain bullets in 7.62x54R they were louder than the spam can stuff by a small margin. Thought there was a tremendous amount of muzzle flash.
Oh and my 24 inch barrel on my Savage is just as loud as as any 16 inch AR there is.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.