I was hoping someone could run a Quick Load calculation for me on a load with .243 Winchester case, 45 (That's right 45.0 gr) IMR-4895, 100 gr bullet. Someone on another message board suggested it. I responded that based on the loading manuals I have reviewed over the years, it appeared that his load was extremely over pressure and probably dangerous. Heck, I have never gone over 43.0 gr with IMR-4350 with a 100 gr bullet. I would never have considered 4895 with a 100 gr bullet with that much IMR-4895. I value my rifles, my eyes, hands and rugged good looks too much to risk them with that kind of reckless experimentation.
What do you all think?

I don't have Quickload but a quick trip to the IMR website gave me the following:
32.8 to 35.7 grains is what IMR shows as the range of loads minimum to maximum.
Looks like somebody mis typed "45" when it shoulda been "35".

Don't believe everything you read on the internet and be safe!

 Cartridge          : .243 Win.
Bullet             : .243, 100, Sierra SP 1540
Cartridge O.A.L. L6: 2.710 inch or 68.83 mm
Barrel Length      : 24.0 inch or 609.6 mm
Powder             : IMR 4895

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   81    36.00   2868    1826   49917   9381    100.0    1.243
-18.0   83    36.90   2923    1897   53375   9502    100.0    1.207  ! Near Maximum !
-16.0   85    37.80   2977    1967   57048   9619    100.0    1.172  ! Near Maximum !
-14.0   87    38.70   3030    2038   60924   9734    100.0    1.140  !DANGEROUS LOAD-DO NOT USE!
-12.0   90    39.60   3082    2110   65031   9846    100.0    1.108  !DANGEROUS LOAD-DO NOT USE!
-10.0   92    40.50   3134    2181   69391   9955    100.0    1.078  !DANGEROUS LOAD-DO NOT USE!
-08.0   94    41.40   3186    2253   74019  10061    100.0    1.050  !DANGEROUS LOAD-DO NOT USE!
-06.0   96    42.30   3236    2326   78934  10163    100.0    1.022  !DANGEROUS LOAD-DO NOT USE!
-04.0   98    43.20   3287    2399   84158  10262    100.0    0.996  !DANGEROUS LOAD-DO NOT USE!
-02.0  100    44.10   3337    2472   89714  10358    100.0    0.970  !DANGEROUS LOAD-DO NOT USE!
+00.0  102    45.00   3386    2546   95626  10449    100.0    0.946  !DANGEROUS LOAD-DO NOT USE!
+02.0  104    45.90   3436    2621  101923  10538    100.0    0.922  !DANGEROUS LOAD-DO NOT USE!
+04.0  106    46.80   3485    2696  108636  10622    100.0    0.899  !DANGEROUS LOAD-DO NOT USE!
+06.0  108    47.70   3534    2773  115802  10702    100.0    0.877  !DANGEROUS LOAD-DO NOT USE!
+08.0  110    48.60   3582    2849  123458  10779    100.0    0.856  !DANGEROUS LOAD-DO NOT USE!
+10.0  112    49.50   3631    2927  131650  10851    100.0    0.836  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba    102    45.00   3446    2636  110500  10210    100.0    0.899  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    102    45.00   3299    2417   80161  10794    100.0    1.010  !DANGEROUS LOAD-DO NOT USE!
 

So, depending on the burn rate a lightly compressed load of 45grs of IMR4895 might produce chamber pressures in the region of 80-110Kpsi...

I think Snellstrom has hit the nail on the head, it must be a misprint for 35 grains.

Thanks for the replies, but no, it wasn't a misprint. That was what I assumed and suggested in my reply to the guy's post. Instead he tried to defend how his load was "within the structural maximum for the case". He even claimed that using Lapua brass with small rifle primers he could go to 90,000 psi. Yikes! I don't think even bench rest shooters with blueprinted actions would consider loads at that level.

He sounds like a tit.

The best brass begins to flow at around 65Kpsi, most stuff a fair way below that from what I can see.

I once blew a primer pocket with a load that QL estimated to be at 70Kspi. The action was very hard to open and the case looked very obviously wrecked.

Internet load data, of course...

quote:

The best brass begins to flow at around 65Kpsi, most stuff a fair way below that from what I can see.

You may want new glasses. Today chamber pressures over 60,000 psi are pretty normal for newer factory loads and the brass does not "flow" at those pressures.

SAAMI pressures:
.243 WSM - 65,000 psi
.270 WSM - 65,000
7mm Weatherby - 65,000
7mm RSAUM - 65,000
.300 RSAUM - 65,000
.300 WSM - 65,000
.300 Weatherby - 65,000
.300 RUM - 65,000
.338 Federal - 62,000
.340 Weatherby - 62,500
.454 Casull - 65,000
.460 S&W - 65,000
.458 Lott - 62,500
.500 S&W - 60,000



.

quote:

Originally posted by TX Nimrod:

quote:

The best brass begins to flow at around 65Kpsi, most stuff a fair way below that from what I can see.

You may want new glasses. Today chamber pressures over 60,000 psi are pretty normal for newer factory loads and the brass does not "flow" at those pressures.

SAAMI pressures:
.243 WSM - 65,000 psi
.270 WSM - 65,000
7mm Weatherby - 65,000
7mm RSAUM - 65,000
.300 RSAUM - 65,000
.300 WSM - 65,000
.300 Weatherby - 65,000
.300 RUM - 65,000
.338 Federal - 62,000
.340 Weatherby - 62,500
.454 Casull - 65,000
.460 S&W - 65,000
.458 Lott - 62,500
.500 S&W - 60,000



.

These old glasses of mine have done fine until now, they have enabled me to read a little about metallurgy for example.

Have a little read of this: http://www.alcobrametals.com/guide.php?metal=16

this: http://www.roymech.co.uk/Usefu...r/Copper_Alloys.html

and this: http://en.wikipedia.org/wiki/Yield_strength apropos this: http://en.wikipedia.org/wiki/U...ate_tensile_strength.

You should understand by the end of it.

Other Forum Link 243win- The "service maximum average pressure" is 60,000 psi. Proof Cartridges 80,000 psi minimum average & 86,000 maximum average. Modulus of elasticity- Cartridge Brass-
Material is 70 copper/30 zinc with trace amounts of lead & iron , called C26000. The annealing temperature for this alloy is between 800 and 1400 F. Material starts to yield at 15,000 PSI when soft (annealed), and 63,000 PSI when hard.
Material yields, but continues to get stronger up to 47,000 PSI when soft, and 76,000 PSI
when work hardened. Modulus of Elasticity is 16,000,000 PSI. This means to pull a 1.000 inch long strip to 1.001 inch long induces a 16,000 PSI stress.
So if you pull a 1.000 inch strip to 1.005 inch long, you get about 76,000 PSI, which is the max obtainable.
Link to SAAMI

quote:

I don't think even bench rest shooters with blueprinted actions would consider loads at that level.

Benchrest shooters typically shoot moderate pressure loads, not high pressure loads. When your case necks are lathe turned to fit your tight throat, you want the cases to last as long as possible. This translates to starting with quality brass, neck sizing, and loading to moderate pressure.

2ndtimer,
Thanks to the guys who post and offer up help on AR I have settled on a pet load for hunting deer with the .243. 100grn Hornady Interlock sp
31grn H4895 cci200 lr primers Norma brass. Sub 1" @100yds. Chrono; 2709.86.jc