I use bolt cutters for the larger ones and these:
http://www.harborfreight.com/11-inch...ter-37837.html for 1/16 and smaller. I grind the ends with a bench grinder or dremel.
By the way, 316L is not stronger than 308L; it's more resistant to corrosion and for our application, the difference isn't enough for me to justify the price difference which can be pretty high sometimes. If the price is pretty close, I go with the 316.