Any one have Quick Load program

[parrott1969]

I hate to say this but I became to comfortable today while loading up some .223 and did not verify my charge weight. So lets just say I made a BOO BOO. I loaded several hundred rounds with 26.5 grains of AA2520 in them. COL is 2.255 and it will be shot in my AR-15's chambered in 5.56. Its a half grain over specs and I really do not want to pull them down. So can some one with quick loads tell me if I am OK? I thought I say a post where someone had used quick loads and it showed a max of 27.5 grains which yielded 62000 psi. If no one can help me then I KNOW WHAT I WILL BE DOING NEXT WEEKEND AND ITS REALLY GOING TO SUCK!

[helg]

In addition to COL, powder and charge, give the following:

1. Bullet length and weight. I assume that the bullet is jacketed. Bullet type may suffice, if it is well known maker, though length and weight give more accurate results.
2. Unsized case length and its water capacity in grains (how many grains of water fits into the case that is fired from your gun).
3. If you provide barrel length, then muzzle speed can also be calculated.
4. I assume the bullet is not overcrimped, and is not loaded with zero jump. These two factors may significantly increase the pressure.

I will run your parameters through QuickLoad.

[helg]

QL run result is attached. Check that the parameters match your case. One parameter - the unsized case (fired brass) length, 1.760" - is guessed from my brass. Assuming that the length is not much different from your brass, I would conclude that your load at the edge. According to the attached picture, the QL has calculated 56621psi max pressure (which is 103% of the SAAMI max) and 2900fps muzzle speed. If the fired brass with your parameters is 1.720" instead of 1.760", then the max pressure is 54687psi, which is 99% of the max.

According to SAAMI specs, guns should sustain 30% excess pressure of the SAAMI max pressure, and your rifle is very unlikely to be damaged with the load.

[Larry Gibson]

If you used 52 -55 gr bullets 26.5 gr AA2520 was a "standard" AR load about 20-25 years ago when there was a lot 2520 around and it was cheap. Winchester M193 55 gr FMJBT bullets with that load in LC cases and a CCI 450 primer ran a conistent 2950 fps out of several AR15s and M16A1s. I shot lots of that load through AR/M16s.

My pressure tests with the M43 PBL using a tight .223 chambered Contender 21" barrel show most lots of US M193 run between 56 and 60,000 psi with 3180 - 3230 fps. Remington commercial .223 runs 52 - 55,000 psi. One lot of WCC 07 ran 65,700 psi with 3351 fps from the 21" barrel, rather a warm load so to speak!

Larry Gibson

[helg]

If you used 52 -55 gr bullets 26.5 gr AA2520 The bullet, per PM from the OP, is 62.1 grain. The heavier bullet increases chamber pressure.

[Larry Gibson]

The bullet, per PM from the OP, is 62.1 grain. The heavier bullet increases chamber pressure.

Did not know that and did not read the QL data. Well considering 26.5 gr was never a max load for the 55 gr bullet and Lee lists 27.5 gr as a max load for AA2520 for a 60 gr bullets at 45,600 CUP the 26.5 load should still be ok. If parrott1996 has any real doubts he should just pull the bullets and start over and consider it a lesson learned.

Larry Gibson

[leadman]

I had some 2520 I bought from Pat's Reloading, he bought it bulk from Accurate. I then bought some 2520 canister that was on sale before I used up the bulk.
3 grain difference for same bullet in the 7.65 Arg. for the same velocity. The canister was faster.

Just a thought as I ran into the same thing from #9, #5 from Accurate. This was before Western bought them.

If the OP has used a load with 2520 in his rifle he should have an idea of the burning rate.