I am using 160 gr. Snuffers with the 125 gr. adaptors. After using brass inserts and weights, my arrows weigh 855 gr. and I shoot them out of a 71# recurve. I have not killed anything with this set-up yet, but the penetration I get in my targets is outstanding vs lighter set-ups I've used. I have had several kills with the big Snuffers in my pre-stickbow days and the only non pass throughs I had were on a couple spine hits that embedded in bone and dropped them in their tracks.
IMO a file sharpened and honed Snuffer out of a mid to high weight bow is about as good as it gets for North American hunters. Mine have always flown well, sharpened easily, been tough on impact and penterated to give two holes.