For what it's worth-

Out of Ruger American I did not have a FTF or squib in about 250 rounds.

The WORST ammo I've come across is the new Winchester M-22. Could have been an issue with the lot- but I'd say about 1/30 would FTF or the bullet would hit the ground about 30 yards down range. I still have a box of 500 from that 1000 pack. I think I'll pull sole bullets and see if some are missing powder.