I understand the being shorted argument of 248 vs 200. That is a big jump in payload on target, I’m a 20g shooter, so that would be a huge loss.
A couple things to consider:
-that BB count might be for a specific BB size/load and the marketing team isn’t tracking that on the load you bought.
-Depending on the bismuth source, they might be getting more of a #4.5 or #4 size pellet (USA sizing vs Euro), not that it justifies the incorrect marketing.
-average BB diameter and average load weight would be the great decider of the argument. It would tell you truly where they are coming up short, in the shot size or the load size.
Regardless, hopefully you find some resolution and end up happy with a type of biz.
And last question, have you tried to shoot birds with it yet? Does it hit as hard as the marketing says?