Related to this question, I'm making a card game and I'm at the point where I'm designing the card layout.
Since changing this at a later stage will involve a lot of work, I would like to be sure I'm not making a mistake. I want to use "poker size" cards, but I've seen at least 4 different sizes for those: B8(62x88mm), 63x88mm, 63.5x88mm, and 2.5"x3.5" (63.5x88.9mm). The potential need for margins also affects the size of my layout. Several games have layouts that reach the card edge, but I am unsure if that is easily printable.
I'm in Canada if that makes a difference.