Now I could be completely but I would that any bullet that looses velocity it's BC drops as well. I'm sure on of the more knowledgable members will chime in and correct me or add upon this.

For me I am comparing the 35 gr Berger to a 39 gr BK so there is a big difference especially in wind drift even if the velocity is 200 fps slower than what I'm shooting my 35 gr Berger.
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Remington .204 VS SF II