There’s nothing statistically different about those groups, so leaving a decision to random chance is just as viable as any analysis of these groups. Roll a die (as in shooting craps), letting fate decide which load you shoot. Assigning the NUMBERS 1 & 2 to one load, 3 & 4 to another load, and the numbers 5 & 6 to the third load, like choosing heads or tails, but for 3 options instead of 2. If you roll a 3, you choose the 2nd load...