50 vs 68 caliber
Shooting 30 rounds at 75 feet out.
We used the GIMilsim FM-50 paintball gun shooting GIMilsim 50 caliber paint.
We also used the Turbo Shocker with J&J Ceramic barrel shooting .68 caliber RPS Evil weighing 3.0 grams each.

Both shot at 75 feet, we threw out the worst 3 shots (outliers) to compensate for bad paintballs.

Results:
.50 caliber - 30 shots, throwing out the worst 3 = 17 1/2 inch diameter spread
.68 caliber - 30 shots, throwing out the worst 3 = 12 1/2 inch diameter spread

Even if we didn't throw out the worst three on the 68 caliber, but threw out the worst three on 50, the 68 caliber had a 16 3/4 inch spread keeping even the outliers.

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