I think what I am starting to realize is what I will call the 10mm conundrum, and I'll try to sum it up as best as possible. This is relevant at very close distances (within 10 yards self defense shooting and likely most duty shooting situations) as when you open up the distance that 1261fps 200gr xtp may only be doing 1100 at impact making it perfect for hunting. What we have been seeing is that all this extra speed and showmanship of muzzle energy is getting us nowhere. We are increasing our recoil, muzzle flash and for many folks reducing shot split times on target without an increase in lethality. The hornady custom ammo 200gr XTP moving at 1083fps is an outstanding hunting bullet, deep penetration, mild expansion of just about .54 source gun classifieds crank that same bullet to 1261fps and it loses 7" of penetration and expands to .675 (tnoutdoors9) What else has numbers that are damn near identical to that? 124gr +p HST fired from a 4.2-4.5" barrel pocketgunsandgear several different barrel lengths with and without denim. out of the 4.2" barrel it expanded .650" going 1157fps which is 369fpe and penetrated 18" For comparison the 180gr XTP hornady custom #9126 factory load went 16" through denim and the same clear ballistics gel and expanded to .652 but look what happened to the 155gr XTP, not enough penetration. This is why my glock 26 EDC (99.99 % of the time) load is 147gr HST or 124gr +P HST. From our best researchers Fackler and DocGKR they have said pistol calibers do not exhibit any type of "hydrostatic shock", which means all we can look at is expansion and penetration. If you have the SAME EXACT penetration and expansion, but can do so with hardly any muzzle flash, flip, and no sonic boom which load would you want? If I had to load my G20SF right now for self defense shooting and I could pick ANY load I've seen tested or recovered from a hunt, it would be the 180gr factory XTP load, which I can't even find in stock LOL (and its a bullet that is what 20 years old in design, imagine a true 10mm HST!). The heavier 180gr gives the bullet greater sectional density so it will hold together better after hitting bone than say a 124gr or 147gr, but still has reasonable expansion. I am eager to see how the 175gr critical duty 10mm does, at the 40 s&w speeds the bullet was awful, no better than a critical duty 9mm, which was much worse than the HST 147gr (pistol forum, docgkr) new service caliber handgun tests. (fixed link) At the upper end of pressure in the 10mm case it seems like 200gr or 220gr bonded jhps are what we need if taking full advantage of the case capacity. I will keep begging Speer/ATK and Winchester to come up with a real 10mm load. Input is greatly appreciated. Wanna kill these ads? We can help!