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Old June 12, 2012, 09:23 AM   #5
SL1
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Join Date: November 8, 2007
Posts: 2,001
Wrong manual reference???

rebs posted:

Quote:
I have the Hornady 45th edition book...
That can't be right, since the Hornady Manual 8th edition is copyrighted 2010.

So, no telling what manual the OP is really asking about.

As for ACTUAL Hornady manuals, they use a somewhat different format than most, which I find more useful. They publish a table for each bullet in a particular cartridge, with the powders listed down the left side and the velocities listed along the top in increments of 50 or 100 fps, depending on the cartridge. The table entries are the charge weights of the powders that give the various listed velocities. Where the charge weight of a particular powder needed for a particular velocity is over SAAMI pressure spec, the entry is left blank. Likewise, when the load for a particular velocity is so low in pressure that it might create erratic burning or leave a bullet stuck in a barrel, the table entry is left blank.

So, the Hornady table typically showes a substantial range of useable charge weight for each powder rather than just the max and a "start" value that is 10% less than max (or, perhaps just 3% less for some powders like W-296).

In the Hornady format, the largest charge weight for a particular powder in a table might not be the weight that gives the SAAMI pressure limit, because the charge weight that produces that limiting pressure would not get the velocity up to the next velocity increment shown by the table. So, in that sense, the Hornady max loads might not be "absolutely max". But, they are typically close enough to max that it isn't going to give you any significant benefit to exceed them.

SL1
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