223, 53grn SMK


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Col
April 19, 2012, 07:32 AM
Hi guys. Until now I have been using Varget as my fav load for my .223 CZ 527, generally for 100/200 yards paper shooting. I have now bought a tub of RE 7 to try, Lymans 49th doesnt give a load for this powder,I also have the latest Sierra manual which says 20.6 grns starting load,up to 23.6 max,which means `Why is he asking this question`Well when I looked up these loads on Quickload 21.6 grains was firmly in the RED.I realise Quickload is not absolutely accurate but it sure has made me think, Who do I believe,I know I must work up the load,but even the start load from Sierra`s manual is pretty close to the max from Quickload::confused:

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steve4102
April 19, 2012, 08:28 AM
Not sure what you plugged into QL, but one of us is doing something wrong. Here is my QL calculations with the Generic case capacity of 28.8gr of H20.

Cartridge : .223 Rem. (SAAMI)
Bullet : .224, 53, Sierra HP MK 1400
Cartridge O.A.L. L6: 2.260 inch or 57.40 mm
Barrel Length : 18.0 inch or 457.2 mm
Powder : Alliant Reloder- 7

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 72 17.28 2445 704 27985 7045 91.7 1.102
-18.0 74 17.71 2501 736 29688 7249 92.8 1.078
-16.0 76 18.14 2557 769 31486 7447 93.8 1.054
-14.0 78 18.58 2612 803 33384 7638 94.7 1.029
-12.0 80 19.01 2667 837 35387 7821 95.5 1.009
-10.0 81 19.44 2722 872 37499 7996 96.3 0.983
-08.0 83 19.87 2777 907 39728 8162 97.0 0.957
-06.0 85 20.30 2831 943 42080 8319 97.7 0.931
-04.0 87 20.74 2885 979 44561 8466 98.2 0.907
-02.0 89 21.17 2938 1016 47179 8603 98.7 0.883 ! Near Maximum !
+00.0 90 21.60 2991 1053 49942 8729 99.1 0.860 ! Near Maximum !
+02.0 92 22.03 3044 1090 52859 8844 99.5 0.839 ! Near Maximum !
+04.0 94 22.46 3096 1128 55939 8947 99.7 0.817 !DANGEROUS LOAD-DO NOT USE!
+06.0 96 22.90 3147 1166 59194 9038 99.9 0.797 !DANGEROUS LOAD-DO NOT USE!
+08.0 98 23.33 3198 1204 62634 9116 100.0 0.777 !DANGEROUS LOAD-DO NOT USE!
+10.0 99 23.76 3249 1242 66271 9182 100.0 0.758 !DANGEROUS LOAD-DO NOT USE!

steve4102
April 19, 2012, 08:30 AM
You didn't plug in Accurate #7 did you?

Col
April 19, 2012, 02:39 PM
Steve, I have double checked my q/load result,it still shows 21.6 in the red, even so. Sierra book tells me max 23.6,,which even on your q/load is a very dangerous load. 21.5 on my quickload is max,(purple) I am working on 2.26 max OAL, I also measured my case volume,which is a new case,with a old primer pushed in,it measured 29.9 grains h2o.which should to my thinking lower the pressure. If I follow Sierra`s load,21.6 starting load it would be dangerous according to quickload,maybe I should continue with Varget

Col
April 19, 2012, 02:41 PM
sorry,I can`t show my readings as my q/load will not run on windows 7,I have to run it via a virtual drive,which isolates it from the rest of my PC

rcmodel
April 19, 2012, 02:44 PM
Alliant says 20.5 RX-7 is MAX with a 52 grain Speer.

I tend to believe they might be in the ballpark.

rc

Col
April 19, 2012, 03:48 PM
yes RC I tend to agree. I think a good safe starting load for me will be 19 grains.well below what Sierra recommends I dont rely too much on quickload,but it sure has been accurate this time

steve4102
April 19, 2012, 06:27 PM
Two things, First,I think you may be plugging in different info than I. Second, I do not think R-7 is a good choice for the 223,YMMV. I like powders that are a little slower than R-7 in my 223/5.56, but I'm shootin an AR so I need the slower powders for increased Port pressure. My go to powder is AA 22130/ X-T for 55 gr bullets.

wingman
April 19, 2012, 09:06 PM
I.ve used R-7 with Sierra 52gr match with excellent results.

steve4102
April 20, 2012, 08:40 AM
delete, sorry wrong thread.

Col
April 20, 2012, 08:43 PM
Steve, I plugged in the exact info as you did,OAL 2.26, case volume 28.8 grn H2O,53 GRN Sierra matchking. my readings are still well above yours,still showing 21.6 grn in the red,I think theres something wrong with one or the other program'
I am going to trust my instinct and start very low,work up as far as I can and report back

steve4102
April 21, 2012, 03:31 PM
What version of QL are you running? I am running 3.4 with the 3.5 Update.

wingman
April 21, 2012, 05:51 PM
Just checked my notes, I use 21.4 reloader 7 with sierra 52gr match in both my AR and Savage model 12, no signs of problems.

My sierra print out as stated earlier on another post gives 19.6 start load with a 22.4max. using either 52 or 53 sierra match, Sierra recommended these for the AR15.

Gave excellent results in the AR very mild recoil and accurate. I always start out with suggested beginning load.

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