loading high pressure 9mm questions

[Freyr_255]

So I normally was just shooting loads developed for my IPSC gun out of my TNW ASR in 9mm, but I'm feeling the urge to load the TNW to a higher pressure/velocity. Now normally I do load development looking at standard pressure sign, but in these lower pressure cartridges, what kind of signs do you look for to know you're not safe anymore? Presumably the action of the gun is the limiting factor in that it'll get hammered too hard by the high pressure loadings as it's just inertia/spring based? How would you recommend doing load development for this particular firearm?

I'll probably try this with powder coated 124gr bullets and CFE pistol.

 

[B]

It doesn't matter if it is a rifle, the pressure limits still apply. Use data from a loading manual. 9mm is very unforgiving, small changes can increase pressure greatly, you can be way over and not see any issues until a case gives out on you...

Shotgun powders like Blue Dot and Longshot give some of the highest velocities I have chronoed as far as commonly available powders. Gains from a rifle barrel are pretty healthy too. That's as good as I can do until I start developing loads exclusively for my carbines.

 

[Ravage]

You will get more velocity from the longer barrel for sure, The published min max loads for 9mm does not include +p or +p+ loads. 9mm nato ammo is also loaded much higher than normal 9mm, You can google around to find load data for nato and +p 9mm

 

[pacobillie]

There are published loads that will produce higher velocities, yet stay within the pressure parameters of the cartridge/firearm. Stick with published loads and never exceed max loads.

 

[B]

You will get more velocity from the longer barrel for sure, The published min max loads for 9mm does not include +p or +p+ loads. 9mm nato ammo is also loaded much higher than normal 9mm, You can google around to find load data for nato and +p 9mm

9mm NATO is usually hot but it isn't much faster than quality commercial FMJ. I know because I have tested about 10 different kinds over a chronograph. The OP is going to want a load that uses a nice big charge of Longshot. Looking at my data I gain up to 300+fps with some bullet weights.

 

[Ganderite]

So I normally was just shooting loads developed for my IPSC gun out of my TNW ASR in 9mm, but I'm feeling the urge to load the TNW to a higher pressure/velocity. Now normally I do load development looking at standard pressure sign, but in these lower pressure cartridges, what kind of signs do you look for to know you're not safe anymore? Presumably the action of the gun is the limiting factor in that it'll get hammered too hard by the high pressure loadings as it's just inertia/spring based? How would you recommend doing load development for this particular firearm?

I'll probably try this with powder coated 124gr bullets and CFE pistol.

9mm is not exactly a "low pressure" round. It runs around 35,000 psi, similar to a 357 Mag. The longer barrel will give you more velocity, but if you use 2 scoops you will really batter a blow back action.

 

[Freyr_255]

9mm is not exactly a "low pressure" round. It runs around 35,000 psi, similar to a 357 Mag. The longer barrel will give you more velocity, but if you use 2 scoops you will really batter a blow back action.

Everything is relative. Generally I load for blot actions in the 60,000 psi range where you can just use brass and primer deformation to find your maximums. In cartridges where they don't generate that kind of pressure I was/am not sure how to go about developing a load that isn't straight from the book.

Thanks for the replies so far everyone!

Cheers!

 

[4n2t0]

Everything is relative. Generally I load for blot actions in the 60,000 psi range where you can just use brass and primer deformation to find your maximums. In cartridges where they don't generate that kind of pressure I was/am not sure how to go about developing a load that isn't straight from the book.

Thanks for the replies so far everyone!

Cheers!

You're right, everything is relative. When compared to other pistol cartridges 9mm is a high pressure round.

Load development is virtually identical. Start with book and work your way up until that "low pressure round", lol, shows you it too produces signs when pushed too far.