Hello Lancel,
No, unfortunately I didn't specifically have the word Mag in the 9/28/06 post though the 240gr XTP listed is a Mag only projectile. As for velocity, 1,200 fps was the low for non-Mag, Mag's upto and including 1,600 fps.
Myself and 2 others I hunt, shoot and re-load with for years own .454's. With load development, accuracy determination, chronographing etc. the $600+ area of purchases using Hornady bullet products is not out of the question. Then came Barnes XPB, that learning curve quickly shortened for us. Other than flattening out bullet drop I no longer need those speeds. The Barnes opens completely and consistently with a more devastating wound channel than other bullets at greater speeds.
Good hunting to you and yours.