the 311 is a CX maxima 250 3d select fletched with 4" feathers

the 382 is a CX maxima 350 3d select fletched with 4" vanes

Shaftdiameters are 3 or 4 thousandths of an inch apart. Both shafts are 26 inches.

I have not recorded where they both hit at various ranges. Though I'm probably wrong I'm not sure if that matters so much because in the end, fact remains that they still hit about the same poi at 40yds while they are 71gr apart in weight. -SHRUGS-