.223 Rem in Quick Load... which one?!?

[memilanuk]

So... I'm twiddling w/ QL and getting ready to try some N540 behind an 80gr Berger, and I notice there are several different '.223 Rem' chambers available in the program. The question is, which one do I use?

.223 Rem,62k+ psi, CIP)
.223 Rem SAAMI,55k psi, SAAMI)
.223 Rem NATEC PCA case,55k psi, SAAMI)
.223 Rem Samereier,30k+ psi, Samereier)
5.56x45mm NATO,58+k psi, EVPAT)

The big difference seems to be the way the pressure is measured,second value in parentheses above). I have no idea if any are even remotely equivalent. The gun in question has a .223 Wylde chamber in it.

TIA,

Monte

 

[techshooter]

Monte:

The important parameters are case volume and length. The pressures are up to you...

With an accurate volume and length,with seating depth drives actual fired case volume), QL will give good results. Pick the version that matches your brass, or even edit one and save it off as a Monte Special .223.


Cheers,

 

[crustyrusty]

the wylde chamber takes in consideration all of the 5.56 nato specs so I would use that and the pressure curve as well

 

[Highpower-FClass]

So... I'm twiddling w/ QL and getting ready to try some N540 behind an 80gr Berger, and I notice there are several different '.223 Rem' chambers available in the program. The question is, which one do I use?

.223 Rem,62k+ psi, CIP)
.223 Rem SAAMI,55k psi, SAAMI)
.223 Rem NATEC PCA case,55k psi, SAAMI)
.223 Rem Samereier,30k+ psi, Samereier)
5.56x45mm NATO,58+k psi, EVPAT)

.223 Rem and .223 Rem SAAMI has the same QuickLoad case capacity of 28.80 grains water. 5.56x45mm NATO has a QuickLoad case capacity of 28.50 grains water.

They have different stated max pressures (62366 psi for .223 Rem 5.56x45mm NATO, 55000 psi for .223 REM SAAMI).

Otherwise these three profiles are identical in QuickLoad.

You will get the same QuickLoad results for .223 Rem and .223 Rem SAAMI in terms of velocities and predicted pressures, it is only the 'Near Maximum' and 'DANGEROUS' warnings that show up differently due to their different max pressure settings. You will get different predicted pressures with '5.56x45mm NATO' because of the reduced H2O capacity.

All that being said, your QL results would be most accurate if you measured the H2O case capacity of your fired, then resized, cases and used that for the Maximum Case Capacity. You would then have QuickLoad settings that match your actual brass in that regard.

Or you can do what I do which is to use '.223 Rem' and fiddle with the powder factors until QL matches your velocity observations

 

[memilanuk]

This thread is twelve years old...

 

[Highpower-FClass]

Gah, bitten by the zombie

 

[Zero333]

I like old threads. I'm weird like that.

Besides ...12 years is nothing in the grand scheme of things.

 

[Ned Ludd]

I like old threads. I'm weird like that.

Besides ...12 years is nothing in the grand scheme of things.

It's exactly how long we have left (according to AOC). Spend it wisely .

 

[Zero333]

It's exactly how long we have left (according to AOC). Spend it wisely .

We have our own Climate Barby up here in Canada. He's the Minister of environment and she's dumber than a turkey.