If it was me I'd rely on the bullet manufacturer rather than the powder manufacturer since bullets have different shapes and lengths. If they don't have the info on their website, you can usually call and talk to someone in the know for specifics. What bullets are you using?
Just so you don't get too paranoid - remember that revolvers are pretty forgiving. As long as you're not shooting the heaviest load possible, have the bullet deep enough to not fall out, and short enough to fit in the cylinder, you'll be fine.
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