I have been using the Forrester collet bullet puller since 1980-81. On hard cast it pulls 2/3 +/-, on soft lead it is slightly less than 1/2. The amount of ogive effects the success rate, the rounder, the worse success! None of the lead bullets are worth reloading! However as we all know: Lead Bullets are VERY recyclable!
I gather up ammo of the same diameter bullet, for example all 44's. Then I pull bullets by shell holder: 44 Mag, Special, & Russian all use the same shell holder, 44 WCF and 444 Marlin are the same shell holder. After the collet puller is tried, then I go with the kinetic puller. There always end up being a few that just don't come apart! I only mess with these if they are in a rare/expensive brass like the 44WCF and 444 Marlin, these I go at with very nasty toothed plyers!
When disassembling live ammo, unless I just loaded the ammo, I consider all gunpowder to be contaminated. I dump it all together and usually burn it, but have put it on a wet lawn as fertilizer. Primers are also always disposed of!
One of the reasons I prefer the Forrester puller is you can drill a 1/4" hole through the top cap and insert a bolt as a knock out rod. I use a brass toilet flange bolt, they have a very large head and won't erode the tool! I have in the last few years gone to Hornady L-N-L bushings for my Rock Chucker press, I have the puller Loctited in one of the bushings because of the harsh treatment I give it.
Ivan