I always try to check internet data against a good hard-copy loading manual or the data from the powder manufacturer's web site. However with the 6.8 SPC that's not always possible, so I've had to rely on data from the forums. I'll trust that data if it's from a forum sight where lots and lots of folks are saying they've used a load safely. I'm not talking two or three people, but at least 10 or more saying it's safe. I always back off at least 10% for the starting load. So far I've never blown myself up -- knock on wood.