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Old 05-22-2013, 04:42 PM   #11
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Old 05-22-2013, 05:14 PM   #12
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Lets take a look at a little computer generated QL data.

In this example I used the old 30-06 with 180gr Sierra and IMR 4350.

Here is tested data from Hodgdon's web site.

Code:
180 GR. SIE SPBT 	IMR 	IMR 4350 	.308" 	3.300" 	53.0 	2586 	48,300 PSI 	56.5C 	2752 	57,200 PSI
Plugging the same components as Hodgdon into QL, we get this data.

Code:
 Cartridge          : .30-06 Spring.  (SAAMI)
Bullet             : .308, 180, Sierra SPBT 2160
Cartridge O.A.L. L6: 3.300 inch or 83.82 mm
Barrel Length      : 24.0 inch or 609.6 mm
Powder             : IMR 4350

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   83    45.20   2263    2046   30467   7728     90.4    1.564
-18.0   85    46.33   2318    2147   32476   7969     91.6    1.523
-16.0   87    47.46   2373    2250   34617   8202     92.7    1.483
-14.0   89    48.59   2428    2356   36901   8426     93.8    1.444
-12.0   91    49.72   2483    2464   39337   8641     94.7    1.401
-10.0   93    50.85   2538    2575   41937   8846     95.6    1.360
-08.0   95    51.98   2593    2687   44714   9039     96.5    1.320
-06.0   97    53.11   2648    2802   47682   9221     97.2    1.282
-04.0   99    54.24   2702    2919   50855   9389     97.9    1.246
-02.0  102    55.37   2757    3037   54250   9545     98.4    1.210  ! Near Maximum !
+00.0  104    56.50   2811    3158   57887   9685     98.9    1.176  ! Near Maximum !
+02.0  106    57.63   2865    3280   61751   9811     99.3    1.143  !DANGEROUS LOAD-DO NOT USE!
+04.0  108    58.76   2919    3404   65879   9921     99.6    1.112  !DANGEROUS LOAD-DO NOT USE!
+06.0  110    59.89   2972    3530   70300  10014     99.8    1.081  !DANGEROUS LOAD-DO NOT USE!
+08.0  112    61.02   3025    3657   75041  10090    100.0    1.052  !DANGEROUS LOAD-DO NOT USE!
+10.0  114    62.15   3078    3786   80130  10149    100.0    1.023  !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    104    56.50   2932    3435   69272   9382    100.0    1.094  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    56.50   2643    2792   47088   9494     93.6    1.285
Note how close QL generated data is to actual tested data.

All this is very cool and a great tool for the handloader, but it is not a substitute for actual tested data when working up loads. Helpful, you bet, substitute not so much.
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Old 05-22-2013, 07:29 PM   #13
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Quote:
Originally Posted by JimRau View Post
It is very hard to 'blow up' a rifle. Pistols I have seen go boom several times. I had a friend who was using a Lee loader MANY years ago and he was loading a 270 with the measure for 4831. He was new at loading and not the brightest bulb in the batch so when he ran out of power he went to the local hardware store and ask for some powder. The clerk was not much better than he so when he ask what power he wanted he said it starts with a '4', so he bought 4227!
He loaded up 20 rounds with the 4227 using the 4831 (case capacity) measure and we went to the dump one weekend to shoot rats and whatever else we could and he let go with the first round. He was shooting a Remington 721. WELL the gun went flying, he spun around and was on his knees holding his poor shoulder and the bullet left a very visible vapor trail. When we picked up the gun the bolt was locked up. When he told me what he did I told him to send the gun and loads to Remington, which he did. Some time later he got the gun back with a letter for Remington. The bolt face had split and locked the bolt up. They checked the barrel and found it was not damaged. They replaced the bolt and told him the load he had shot in this gun FAR exceed the proof loads they use. They did not return the ammo he sent.
Point is it is VERY hard to destroy a modern bolt action rifle. I have another story about us trying to blow up an old Mauser, but that is for another time.
Just start at the low end of the manual recommendations and if you have a chronograph use it.
its hard to kaboom a bolt gun its easy to kaboom a semi-auto
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Old 05-23-2013, 12:51 PM   #14
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'Easy' is a relative term. I would be 'easier' to destroy a rifle with an action not as strong as the bolt action, but still you would have to do it intentionally. We placed 'hot rounds' in the ammo caches in RVN to destroy AK's and SKS's as well as some mortars. I did not get to examine any of these rounds in detail but was told they were loaded with 'demolition' material (RDX based), not smokeless powder. I am curious what would've happened to a 740 if the 270 rounds described above would have been fired in it!
It would not have been good!

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Old 05-25-2013, 02:46 AM   #15
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You can get pretty decent chronographs under $150.

www.midwayusa.com

Not as nice as an Oehler but very serviceable

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