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getting a 240 grainer going 1300 fps from 4 1/2 incher may mean you are already operating at upper pressure level. Usually the velocitys used by companys are from longer barrels, and a couple inches in 44 mag can make a significant difference.
Difficult extraction as u increase your your load levels can indicate a higher pressure over your previous load. It is not a reliable indication of max pressure in revolvers, and should not be relied on to indicate a pressure level to be reached.
The velocitys listed for the 200 grain plated bullets and 19-20 grains N-110 look unusually low. From a 4 inch S7W mt gun using 21.0 N110, Rem 210 sjhp and Fed 150 primers am consistently getting about 1350 fps. Very accurate load.
The loads listed for the years using N110 in 357 mag have been all over the map, as are the primers used. The first loads listed by Vihatori (spelling) were using small rifle primers and the pressures were measured differently. Speer has specifically gone to regular small pistol primers, and increased the charges over most other manuals.
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