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Old August 27, 2010, 03:07 PM   #6
Jim Watson
Senior Member
 
Join Date: October 25, 2001
Location: Alabama
Posts: 11,430
In the first place, you don't want to get too close to the floor. A change in components or ambient conditions or chronograph calibration could turn your barely acceptable f 127,000 load into a disqualifying f 124,900. I had it happen, I took my P226 to a match with ammo loaded for my Colt but not retested. It would not deliver as much velocity as my Colt. Fortunately the chronoman at the match had a Colt 9mm as a reference gun and my ammo passed in it, so I could continue.

In the second place, handbook velocity, shot in minimum dimension, smooth surfaced test barrels, is usually pretty optimistic. A starting load with the 135 would probably be fine.

Caveat: I do not own a .40, my experience is limited to 9mm, .38, and .45.
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