How many different directions do you think you can go? Pressure? Subsonic? Volume? Coolest?
Very few of the reloaders here use "cool" or "volume" as dictates for their reloads. Typically, reloading is done to develop a load for accuracy, for reliability, for economy, or for a defined terminal outcome.
If noise is your concern, get better hearing protection or a suppressor. Projectile selection is primarily a function of your use for the firearm.
If you have a specific use for your Kriss, let us know. That will give us more info to help you tailor your loads.

 

Different ideas for different uses. I'm wondering if recipes or even ammo exists tailored to maximize potential of a 16" barrel in 45 acp regardless of which potential were discussing. Basically does 16" 45acp ammo exists? If so what's it's goal.

 

I'm thinking that you're not going to see a huge velocity increase simply because the gun has a 16" barrel. The .45 ACP is a pretty low-pressure cartridge, and while there's additional room for powder, I doubt if the cartridge case (or gun) is up to it. You could try some +P loads and see where that gets you, but I certainly wouldn't push it past that.

 

Standard 230 gr loads do not gain much out of a 16" barrel and should be subsonic.

BBTI - Ballistics by the Inch :: Results

(statement of intent)

www.ballisticsbytheinch.com

 

So I was discussing velocity and decibel from a 16" barrel 45 acp. (Kriss) so if reloading what's the best way to go? What's the best projectile what speeds reasonable to get up to and how loud is it?

Is it practical to tune a heavy rounds so that it's subsonic but pressure and thus volume is less bad at 16"?

Basically what are the coolest things you can do to make the most of it?

Don't worry about it. Just use standard pressure 230s and there will be a significant noise drop off from the 16" barrel. Not hearing safe, but definitely quieter.

You're not getting a 230gr .45 ACP bullet to go super-sonic safely, or maybe at all.

 

I had a Beretta CX4 storm carbine in 45ACP and it was ridiculously quiet. Every time I shot it people came up to me and asked if it was suppressed.

Some loads might even slow down out of a 16” barrel vs a 5” barrel.

 

So I was discussing velocity and decibel from a 16" barrel 45 acp. (Kriss) so if reloading what's the best way to go? What's the best projectile what speeds reasonable to get up to and how loud is it?

Is it practical to tune a heavy rounds so that it's subsonic but pressure and thus volume is less bad at 16"?

Basically what are the coolest things you can do to make the most of it?

Just for the hell of it I loaded up some 45ACP rounds and compared the velocity out of a 5" 1911 and a Hi Point carbine with a 16" barrel. The bullets fired from the carbine were generally about 170 feet per second faster out of the carbine. The load I liked best for my plinking happened to be a 200 grain lead Semi Wadcutter over 5 grains of Bullseye. That gave me 862 fps from the 1911 and 1060 fps from the carbine. The only factory round I checked was a Blazer 200 grain JHP wih 962 fps from the 5" vs 1104 fps from the 16" barrel. Just about any 45 ACP round would still be subsonic unless you went to a light bullet. With a can the carbine sounds like a stapling gun.

 

Absolutely, I have a HP 4595, and she is great with both subsonic suppressed, and in high speed Critical Defense loads. Both in taking out wild pigs within a foot ball field in distance. Everyone seems to think 100 yards is nothing, but how many hogs get shot at 50 to 75 yards? Well, most of them. For this I had been thinking of getting a 300 Blackout, but up to now, I'm not actually seeing a lot of difference. Plus I have a 45 on my hip that shares magazines with my PCC.

 

If I remember right, the Kriss is just a blowback with some linkages and weight in the action. Blowbacks, in general, work best with fast powders (relatively) so that the chamber pressure has dropped enough before extraction starts. Better for the action, extractors and brass (if you care). You can pick up 200+ fps with 200g and lighter, so yes, you can get them supersonic with 16" barrels. With 230s, you might be getting up to 150 fps, so likely not supersonic. In many 9mm loads with 16" barrels, the bullet will reach max velocity in the barrel and then slow down the last several inches. I have some that are actually slower from a 16" barrel than from a 5" barrel. Fast powders and light bullets are generally the best in terms of keeping it running the best, softest and longest. Slow powders (in blowback carbines) don't seal the brass to the chamber soon enough and the action opens with the pressure still elevated.

Yes, will be much quieter than your pistols. Still need hearing protection in most cases.

With slow powders and heavy bullets, pistol cartridges can do some impressive things, but not with unlocked actions.