Yes! I've been loading the NAS3 cases in 308 AND the 7bc cases. Several firings on each. Both performing well.
A new-to-me term I'm seeing: +P ??
- Thread starter 8x68s
- Start date
Mikecr
Well-Known Member
Any concerns with bolt thrust?
436
Well-Known Member
Thanks, I'll see if I can run it down. Perhaps you could help me here and point out where it's located: https://saami.org/technical-information/ansi-saami-standards/
Trying to backdoor it, all I come up with is this.
**No, SAAMI does not appear to have released a standalone "new paper" specifically on new pressure parameters.**
SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) maintains voluntary industry performance standards (ANSI/SAAMI Z299 series) that define **Maximum Average Pressure (MAP)**, velocity, dimensional specs, testing procedures, and related criteria for commercial ammunition. These are periodically revised rather than issued as separate technical papers or white papers.
### Recent Updates
- **SAAMI Z299.4 – 2025** (Centerfire Rifle): Updated in early 2025. It covers pressure and velocity standards, with minor adjustments to velocities, new cartridge additions, and updated procedures/equipment. A press release announced its release on February 12, 2025.
- **SAAMI Z299.1 – 2026** (Rimfire): Reaffirmed/updated as of 2026 (R2026).
- Other standards (e.g., pistol Z299.3 – 2022, shotshell Z299.2 – 2019) remain on their prior cycles.
These full standards (available as free PDFs on saami.org) include detailed pressure data, proof loads, transducer methods, and explanations of terms like MAP, CUP (Copper Units of Pressure), and statistical limits (e.g., MPLM). Revisions typically add new cartridges, tweak velocities, or update testing references rather than overhaul core pressure limits.
### Additional Resources
- SAAMI's **Pressure Limits Calculator** (a downloadable tool from 2018, no major recent updates noted).
- No recent standalone technical papers, research white papers, or major methodological shifts (e.g., in piezo transducer use) turned up in searches. Changes are integrated into the Z299 standards.
For the latest details, check the [SAAMI standards page](https://saami.org/technical-information/ansi-saami-standards/), where PDFs are freely downloadable. These are aimed at manufacturers (with a note that they apply to handloading for safety but SAAMI doesn't provide reloading guidance). If you're looking for specifics on a cartridge or change, the full standards documents are the authoritative source.**No, SAAMI does not appear to have released a standalone "new paper" specifically on new pressure parameters.**
SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) maintains voluntary industry performance standards (ANSI/SAAMI Z299 series) that define **Maximum Average Pressure (MAP)**, velocity, dimensional specs, testing procedures, and related criteria for commercial ammunition. These are periodically revised rather than issued as separate technical papers or white papers.
### Recent Updates
- **SAAMI Z299.4 – 2025** (Centerfire Rifle): Updated in early 2025. It covers pressure and velocity standards, with minor adjustments to velocities, new cartridge additions, and updated procedures/equipment. A press release announced its release on February 12, 2025.
- **SAAMI Z299.1 – 2026** (Rimfire): Reaffirmed/updated as of 2026 (R2026).
- Other standards (e.g., pistol Z299.3 – 2022, shotshell Z299.2 – 2019) remain on their prior cycles.
These full standards (available as free PDFs on saami.org) include detailed pressure data, proof loads, transducer methods, and explanations of terms like MAP, CUP (Copper Units of Pressure), and statistical limits (e.g., MPLM). Revisions typically add new cartridges, tweak velocities, or update testing references rather than overhaul core pressure limits.
### Additional Resources
- SAAMI's **Pressure Limits Calculator** (a downloadable tool from 2018, no major recent updates noted).
- No recent standalone technical papers, research white papers, or major methodological shifts (e.g., in piezo transducer use) turned up in searches. Changes are integrated into the Z299 standards.
For the latest details, check the [SAAMI standards page](https://saami.org/technical-information/ansi-saami-standards/), where PDFs are freely downloadable. These are aimed at manufacturers (with a note that they apply to handloading for safety but SAAMI doesn't provide reloading guidance). If you're looking for specifics on a cartridge or change, the full standards documents are the authoritative source.
I appreciate the sitrep; I find the subject matter very interesting, as you can see, reloading information is a bit of a hobby with me, as is reloading itself. That's one side of my reloading area; the dies are two deep, so I really am interested in your information. Cheer's
Last edited:
Mikecr
Well-Known Member
436
Just,, WOW
Just,, WOW
That is why I do not want to have a lot of different calibers, but that is just me
std7mag
Well-Known Member
For your example, using the components listed, it's about as far as you can go with them.
You're getting 97% case fill. If I remember correctly, the Hornady GMX is a monolithic bullet.
Monolithic bullets are longer for weight compared to a cup & core (jacketed lead) bullet.
Add to that, many monolithic bullet manufacturers suggest STARTING at 0.050" off of the lands. Meaning your COAL is shorter. Meaning that more of the bullet is pushed back into the casing, decreasing the volume of powder capacity.
So in otherwords, with that bullet and that powder in that casing, if you were to try to put more powder in, you would probably be starting to compress the powder.
Not always a bad thing.
But once you start crunching the powder, things change.
And not in a good way.
If you really want to use that bullet, I'd suggest a different powder!
