Today's 10mm ammo

[sparkyv]

I have several boxes of the 180 gr sig v crown on the way

Factory Ammo 180 gr SIG V-Crown FMJ out of a 4" M610 gave me 1207fps. All my other chrony data is on handloads.

 

[jmr40]

I probably have a lifetime supply of defensive ammo that I bought from Georgia Arms years ago. They used to have a big table at all local gun shows and I would always pick up some in various calibers at every gun show. They do ship, but I have no idea how competitive they are on price with that factored in. But I've been happy with all of the ammo I've bought from them.

HANDGUN - **SELECT BY CALIBER - 10 MM - Georgia Arms (georgia-arms.com)

I don't shoot my 10mm nearly as much as 9mm and 45. I carry Double Tap 200 gr loads in bear country and a box of those will last me a lifetime. I have a few hunded rounds of the 155 and 180 gr HP loads shown above. Whenever I find FMJ locally I pick up a box.

 

[Lennyjoe]

Think I’ll stick to the Underwood offering over the Georgia Arms 10MM +P…..smh

 

[Necessary_Nutrient]

Power pistol will likely be generating near maximum pressure limits around 1300fps where Longshot when loaded around the same velocity will generate far less pressures, allowing Longshot to be loaded into higher velocity ranges. 1,400fps is no problem with Longshot, and still accurate.
Obviously this is some general speak here, variations will occur, but this is generally what ive gathered over the years.

That sounds like very dangerous advice. Factory data for longshot is readily available and although I've gotten close to 1300 fps in a 5.25" barrel, the idea that it is safe to keep going to 1400 is not supported by the factory data below. It also seems like 10MM loads from Hodgdon online have been modified because while I won't say what I was loading to about 2 years ago when I made my current batch, they are higher than the max below.

Longshot.10mm

• Necessary_Nutrient
• Nov 19, 2022

 

[Agsalaska]

The one thing the typical ballistic gel testing overlooks, is wounding effect. When a hollow point bullet expands, it creates a larger frontal surface area to that bullet. All the tissue then pressurized in front of that bullet now has to go somewhere. It if forced out sideways off of the bullet's newly widened meplat. But velocity is a key factor to this, because it determine how much pressure is created on the bullet's meplat, which determines how far that tissue is then sprayed out laterally from the projectiles path.

The expansion robs the projectile of energy and therefore velocity. And with that expanded nose, the terminal sectional density of the bullet is much lower, meaning it will lose velocity much more quickly (or in a shorter distance through a given medium). Which is why we typically see hollow points make a small wound track for the first couple inches of travel through gel, until they expand. Then they suddenly makes a massive wound track which quickly tapers down in a cone shape as velocity is rapidly retarded due to the very low terminal sectional density of the bullet. A parachute effect.

As velocity reduces, the wound track also reduces, because as energy drops the pressure forming on the nose of the expanded bullet and subsequent tissue spray also reduce.

We all know that when we shoot for Center Of Mass (or rather, the thoracic cavity), we're hoping to hit the heart, lungs, or major arteries and veins. We're hoping to cause rapid blood lose. Because reducing blood flow to the brain will result in incapacitation (which stops the threat). The majority of the thoracic cavity contains lungs. The lungs will cause less rapid blood lose than a hit to the heart or the major blood vessels attached to it. So wound size is more of a factor here.

Yet, because we don't have a good way to measure wounding, we seem to ignore it and focus on penetration depth and expansion size of the projectile. Doing so fails to take into account the only factor that actually matters with a COM hit, which is how much potential rapid blood pressure lose can this bullet cause.

Further more, the temporary cavity seen in high speed camera capture of gel tests is largely ignored, as we're told the temporary cavity of handgun projectiles is meaningless. But the force created by the temporary cavity in gel may have a very different effect to the permanent wounding damage in various human tissues than it does in the gel block. Many of us seem to forget that gel is not people, and pay no attention to the variation in temporary cavities in gel when comparing handgun ammunition. I'm not saying the temporary cavity is directly important, but I am saying that the elasticity of gel is not the same as living tissue, and that different organs also have different elasticity from one another. The energy imparted that causes the temporary cavity in gel (and the size of that cavity), may well be relevant to the amount permanent wounding possible in living tissues. But that's inconvenient, so we tend to ignore it.

I hate to quote such a long post, but this is an excellent post and something I have gone back and forth on since acquiring a 10mm.

I acquired a Glock 20 on a trade last year and other than the range haven't figure out what to do with it. The guy I got it from used it in competition and upgraded the trigger and grip making it a really good shooter. I figured I would use it outdoors and maybe replace my 629 in that role. And that makes sense with the correct loads.

But for SD use, I get why they load SD loading down to more or less match .40, but I have to think there is something to your post about the wounding characteristics that is certainly present in testing but not captured and recorded by any scientific method. I would take a 10mm SD load traveling 200fps faster than the same bullet in .40 all day long as long as the bullet could handle the excess speed without failing. I have to believe that larger, more violent wound cavity witnessed in testing could absolutely make a difference if it ever came to that.

 

[The Happy Kaboomer]

96% the ammo I shoot in my 10's is homemade with my hard cast bullets.