jimmyj, here is some data I just collected at the range today. I went there with a box of Winchester white box 165 FMJ flat points and chronoed them also. I also shot 165 and 180 grain reloads using Longshot powder, which looks to me like a great powder for 40 S&W. Here's the data I gathered:
Pistol used: Browning Hi Power
Winchester white box 165 grain FMJ
Avg velocity - 1061 ft/sec
ES - 33 ft/sec
SD - 9 ft/sec
Temperature - 69 F
Power Factor Avg - 175
Power Factor low - 172
Power Factor High - 178
Now for the reload performance data. Both the 165 and 180 grain loads were loaded with Longshot, not far from max load data on the Hodgdon website. Max load for the 180 grain on their site was 8.0 grains and strangely enough, their 165 grain data showed a max load of 7.8 grains.
Bullet - Zero 165 grain JHP
Case - Federal
Primer - CCI 500
Powder - Longshot - 7.6 grains
Avg velocity - 1173 ft/sec
ES - 37 ft/sec
SD - 11 ft/sec
Temperature - 71 F
Power Factor Avg - 193
Power Factor low - 190
Power Factor High - 196
Now the 180 grain data:
Bullet - Hornady 180 grain JHP XTP
Case - Federal
Primer - CCI 500
Powder - Longshot - 7.7 grains
Avg velocity - 1151 ft/sec
ES - 25 ft/sec
SD - 7 ft/sec
Temperature - 69 F
Power Factor Avg - 207
Power Factor low - 204
Power Factor High - 209
Neither of these reloads gave any visible signs of extreme pressure. Primers looked normal and no problems with feed or extraction. The 165 grain load is about 100 ft/sec faster than the WWB 165 plinkers, but probably is more in line with self defense loads for 40 S&W. Just looking at the Speer data, this load would make a good substitute for a Speer 165 Gold Dot load.
The 180 grain load is pretty much a beast of a 40 S&W load, looking at the specs of most factory ammo. Remington does make the "HD Ultimate Defense Ammunition" which the box specifies a full size firearm for, and they show a velocity of 1150 ft/sec for it. Most of your self defense 180 grain ammo shows velocities of a little over 1000 ft/sec. Next time I load 180's, I will probably back off the powder a little more. I did not see any problems with the cases from shooting this load though, no bulged brass or anything.
And I can't complain about the Longshot powder. It meters well and gives great performance in the 40 S&W and accuracy looked good also.
Finally, as always, this is data posted on the interwebs, so take my information as information only. I take no responsibility for what happens if you use this data. I know what I posted and how I load my ammo, but you don't have any idea if I am knowledgeable or not.
