The suggested weight is 1500g, but breeding at 1300g would be just fine, IMO. People have bred their females at that weight before and had successful clutches. But just think, female BPs in the wild breed at whatever age or weight they can, and they may be 800g, or maybe over 1500g, but keep in mind that they get very few meals a month, and I do believe there have been females in the wild that have been bred around 800g. People just feel safer by breeding a female at 1500g because they wouldn't want their BPs to get eggbound, and they will be a pretty good size. I haven't really heard of any eggbound BPs yet, so in my head I'm thinking that there is a very low chance of your BP getting eggbound.
Good luck to your breeding season
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