I've got one. Kind of concerned about some of the data though. They list 62 gr. of H4831 with the 130 in a 270 Win. Most everybody else has backed off to below 60 these days. They do have +P loads for the 257 Roberts, but are below some of the more accepted loads.
Of the loads I've really looked at they are well above what Nosler lists in their latest. May be just those particular loads though.
ole...
I have just about all the loading manuals, and there are many differences between them. It is because there are no two rifles that are the same, and no two shooters that will read pressure signs the same... and there are no hard standards.
For example, the New Hornady manual has maximum loads for the .264 being 5 or 6 grains lower than the Sierra... and I am shooting the Sierra max loads with NO signs, and could probably go a few grains higher if I wanted to. I'd like the barrel to last more than a few weeks, so I'm not going to piush it any more, and may back it off a bit.
I have had guns that were hard to open the bolt well before reaching max, and guns that went well over max with no signs of pressure.
But the point is that ALL of these manuals are just guides to get you started, which is why we all say "Start 10% low and work up".