The best is what ever is hyped to the paper and internet gun writers and then is pushed to the peasants . For the last couple of years it has been Frog Lube and within a couple of years it will be Whale Sperm or Jerk Juice for the same reason that you absolutely need a short magnum because it kills better and cycling the bolt is 16/1,000 of a second faster . So Frog Lube is environmentally sensitive , big f'ing deal , by the time Jerk Juice hits the market you'll be able to drink it from your canteen , rub it on sunburn , lube guns , treat hemorrhoids and wax your pussy . Of course the best stuff will be "Tactical Jerk Juice" .