There is a reason for warnings against unverified load data from various sources.
While many are valid loads, and are possibly usable, it is best to check with a powder or bullet mfgr before ever loading them, if it is an unpublished load. Hodgdon is better to phone, most others will answer e-mails. Many mfgrs have unpublished data, but, verified data, that they will give you, with the usual disclaimer of responsibilty, it will probably work, it might not work in your gun.
This may help give some insight as to why there are all these variations in load data, and why you need to treat unpublished, unverified data with a very large grain of salt. Even some of the info given in this publication is meant to be taken with a grain of salt;
http://kwk.us/pressures.html