You guys are making me feel a lot better about the upper end of the charges. I honestly surprised at the 5.0gr max cited above...wouldn't think that leaves a lot of room for seating a 180 grainer.
But anyway...I'm as happy as can be with anything between 3.0 and 3.4gr so far, under the 180 lead, and in fact I'd have to really concentrate to notice all that much difference in that range, although at 3.0gr it's downright spooky that the 5" M&P still cycles. But, 500 rounds Saturday and 300 today, not a single malf of any kind.
As was I, I double triple checked to make sure I wasn't reading data from a different powder
The sierra data from the late 90's I have look Identical to the "5th edition" with the exception that clays is now listed in the newer data were as it wasn't even an option in the older books I have.
I have been shooting 3-3.5 grs of clays for years it wasn't until recently when I decided to start shooting major loads that I went back through all my data and couldn't find anything using clays that would make major.
I just happened by the SG store Sunday and saw a unwrapped/open Sierra 5th edition manual and decided to take peak and what I saw was WOW different from the their earlier data.
I won't get anywhere near needing 5grs shooting a lead 180gr pill. I only need to make about 925-950fps to make PF and that is achieved with 3.8-4.2 grs of clays shooting lead. If shooting JHP's one might need to load 4.2-4.6 grs to get 925-950fps and still make MPF