True Blue is still a fine choice for use in the FsN pistol and will continue to have its place.. But if you load for the PS90 you may find AutoComp to be superior in many ways.
Metering: I dropped and measured AutoComp charges from my Dillon and found them to have no appreciable variance in charge. +\- .05 grs seems to be the max variance...
Case fill: similar to true blue, case fill is somewhere around 50% (depending on bullet type and charge)
Consistency: Extremely consistent powder often times in the 15 fps standard deviation range... Again similar to true blue.
Power: AutoComp has good power potential in the 5.7x28 - it is less than true blue in terms of max loads but only by around 75 fps... Most people aren't loading at the max anyway...
Function: Heres where AutoComp really shines. It "feels" great in the pistol and functions even better in the PS90 - true blue has always given me trouble in the PS90 in terms of having the mag pop up with medium to max loads from time to time... AutoComp does not exhibit this same trait as true blue, and does not cause the mag to pop up. In fact it doesnt even cause the mag catch to move much or at all! AutoComp also seems to run cleaner than true blue.
Another neat trait is that you can "hear" the powder when you shake the round. This is significant in the fact that you can shake the round and hear the AutoComp shuffle back and forth. With true blue it is Very difficult to hear, if at all... Why is this important? Well it shouldn't be really, but with all the KB's by some lately at least with the AutoComp you could shake it to help guarantee that it is not double charged. If it was double charged, you wouldn't hear it shuffle back and forth, a double charge would either be compressed or filled with such a high volume that you wouldn't hear it slide back and forth. Just an added bonus of AutoComp. But dont use this as your only "safety check" - it is just and Added measure of safety...
If you shoot an AutoComp load and a true blue load side by side you would notice the difference in recoil and "feel" of loads that produce identical velocities... AutoComp is very impressive.
AutoComp is not for beginners however. It is "more" powerful per grain than true blue. However it's fill volume is greater than true blue... All in all you can still double charge with AutoComp... And a double charge would still produce a nasty KB equal to that of true blue. Be careful...
PS90 load example:
5.4 grs of AutoComp with a 40 gr Vmax ran 2250 fps average out of the PS90 with a standard deviation of 17 fps - perfect function and normal shoulder movement. It is a good solid load for everyday shooting that produces around 450 ft lbs of energy (compared to 400 ft lbs from ss197 ammo)
Overall I will be leaning heavily towards using AutoComp from here on, and will post more data as I develop it in my reloading threads!
