help can anyone run a quickload check please

[carlazar]

Was hoping someone could enlighten me on some load developement.
Rifle: 7mm rem mag. 27inch barrell. Norma brass fireformed hold 87 gr water
Have quite a bit of Magpro, would like to use nosler accubonds and partitions in 160 gr.
Primers: CCI magnum
Temperatures at range 65f
Would Appreciate any input

 

[Gus McCrae]

For info only:
I used 71.0 gr. as the powder charge and the default settings for seating depth (COAL) and case length.

Nosler's #7 shows MagPro min @ 68.0 gr. / max @ 72.0 gr.



160 gr. Accubond:

Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 77.289 grain H2O = 5.018 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 27.0 inch = 685.8 mm
Powder : Accurate MAGPRO

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

-12.0 82 62.48 2694 2578 37303 10954 92.9 1.616
-10.0 84 63.90 2757 2701 39845 11245 94.1 1.567
-08.0 86 65.32 2821 2827 42539 11522 95.1 1.519
-06.0 88 66.74 2885 2956 45413 11783 96.0 1.473
-04.0 90 68.16 2948 3088 48479 12028 96.9 1.428
-02.0 92 69.58 3012 3223 51753 12254 97.6 1.386
+00.0 94 71.00 3075 3360 55249 12461 98.3 1.344 ! Near Maximum !
+02.0 96 72.42 3138 3499 58985 12648 98.8 1.305 ! Near Maximum !
+04.0 97 73.84 3201 3640 62980 12813 99.3 1.266 !DANGEROUS LOAD-DO NOT USE!
+06.0 99 75.26 3264 3784 67256 12956 99.6 1.229 !DANGEROUS LOAD-DO NOT USE!
+08.0 101 76.68 3326 3929 71837 13075 99.8 1.193 !DANGEROUS LOAD-DO NOT USE!
+10.0 103 78.10 3387 4076 76749 13169 100.0 1.159 !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 94 71.00 3231 3710 67025 12180 100.0 1.236 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 94 71.00 2863 2912 43871 12020 91.7 1.487




160 gr. Partition:

Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 160, Nosler PART SP 16327
Useable Case Capaci: 79.311 grain H2O = 5.150 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 27.0 inch = 685.8 mm
Powder : Accurate MAGPRO

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

-12.0 80 62.48 2656 2507 35767 10985 92.4 1.646
-10.0 82 63.90 2719 2626 38149 11285 93.5 1.601
-08.0 84 65.32 2782 2749 40668 11572 94.6 1.553
-06.0 86 66.74 2844 2874 43348 11845 95.5 1.507
-04.0 88 68.16 2907 3001 46202 12102 96.4 1.462
-02.0 90 69.58 2969 3131 49242 12342 97.2 1.419
+00.0 91 71.00 3031 3264 52480 12564 97.9 1.377 ! Near Maximum !
+02.0 93 72.42 3093 3399 55932 12767 98.5 1.337 ! Near Maximum !
+04.0 95 73.84 3155 3536 59612 12950 99.0 1.298 ! Near Maximum !
+06.0 97 75.26 3216 3675 63539 13111 99.4 1.261 !DANGEROUS LOAD-DO NOT USE!
+08.0 99 76.68 3277 3816 67733 13249 99.7 1.225 !DANGEROUS LOAD-DO NOT USE!
+10.0 100 78.10 3338 3959 72215 13365 99.9 1.190 !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 91 71.00 3189 3614 63581 12351 100.0 1.266 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 91 71.00 2819 2823 41742 12052 91.0 1.523

 

[carlazar]

Gus
Thank you very much for info, I suppose I should start at 70 gr, and work up every 0.03 gr with th OCW method, watching presure. I worked out 87 gr water capacity on once fired norma brass think you used 77 gr usable water capacity would that mean slightly more pressure as theres more space?
Either way thanks again, and have a good easter holiday

 

[Gus McCrae]

Gus
Thank you very much for info, I suppose I should start at 70 gr, and work up every 0.03 gr with th OCW method, watching presure. I worked out 87 gr water capacity on once fired norma brass think you used 77 gr usable water capacity would that mean slightly more pressure as theres more space?
Either way thanks again, and have a good easter holiday

No. I entered 87 gr. H2O capacity. The program came up with 77 gr. usable water capacity after calculating the space taken up by the bullet. This number will change with a change in seating depth. Pressure will fluctuate depending on case capacity & distance to the rifling.

If it were me, I would probably start at 69 gr. just to be safe.

Happy Easter

 

[carlazar]

Of course, totally forgot that part.
Thanks again

 

[carlazar]

Hello Gus
Sorry to bother you again,

Accubond 160gr
Have had a look at seating depth with hornady comparator, and I am getting 2.824" to the lands, i deducted 0.020" to reach a seating of 2.804" thats backing off 0.020". I then measured the OAL thats from end to end to get a reading of 3.385" (this is a difference of 0.095" on programme default OAL)
Was wondering if you could input the corected OAL and see what quickload says.

The measurements for the 160gr partition, were 2.742" to lands measured from ogive (no backing off) and overall from tip to base is 3.306" bearing in mind that the lead tip on partition is subject to changes in shape seize etc.

Does quick load have an input for the ogive to lands measurement or is it always OAL tip to base ??
I also assume that the highlighted parts would seem to be the otptimum charge for magpro, and best bullet exit time for that length of barrel (27") all within the safe pressure zone?

 

[Gus McCrae]

160 Gr. Accubond:

Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 78.827 grain H2O = 5.118 cm³
Cartridge O.A.L. L6: 3.385 inch = 85.98 mm
Barrel Length : 27.0 inch = 685.8 mm
Powder : Accurate MAGPRO

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 74 56.80 2416 2074 27803 9676 87.2 1.807
-18.0 75 58.22 2478 2182 29680 10014 88.6 1.764
-16.0 77 59.64 2540 2293 31687 10344 90.0 1.722
-14.0 79 61.06 2603 2407 33834 10665 91.3 1.681
-12.0 81 62.48 2666 2525 36128 10974 92.5 1.640
-10.0 83 63.90 2729 2645 38547 11272 93.7 1.594
-08.0 85 65.32 2791 2768 41107 11557 94.7 1.545
-06.0 86 66.74 2854 2894 43832 11827 95.7 1.499
-04.0 88 68.16 2917 3023 46735 12080 96.5 1.454
-02.0 90 69.58 2980 3154 49829 12317 97.3 1.411
+00.0 92 71.00 3042 3288 53126 12536 98.0 1.369 ! Near Maximum !
+02.0 94 72.42 3104 3424 56643 12734 98.6 1.329 ! Near Maximum !
+04.0 96 73.84 3166 3562 60396 12912 99.1 1.291 !DANGEROUS LOAD-DO NOT USE!
+06.0 97 75.26 3228 3702 64403 13069 99.5 1.253 !DANGEROUS LOAD-DO NOT USE!
+08.0 99 76.68 3289 3844 68685 13203 99.7 1.218 !DANGEROUS LOAD-DO NOT USE!
+10.0 101 78.10 3350 3988 73264 13313 99.9 1.183 !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 92 71.00 3200 3638 64384 12305 100.0 1.259 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 92 71.00 2830 2845 42232 12041 91.2 1.515



160 Gr. Partition:

Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 160, Nosler PART SP 16327
Useable Case Capaci: 79.576 grain H2O = 5.167 cm³
Cartridge O.A.L. L6: 3.306 inch = 83.97 mm
Barrel Length : 27.0 inch = 685.8 mm
Powder : Accurate MAGPRO

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 73 56.80 2404 2053 27434 9680 87.0 1.816
-18.0 75 58.22 2466 2160 29273 10020 88.4 1.773
-16.0 76 59.64 2528 2270 31239 10352 89.8 1.731
-14.0 78 61.06 2590 2383 33342 10676 91.1 1.690
-12.0 80 62.48 2652 2499 35583 10989 92.3 1.650
-10.0 82 63.90 2714 2617 37947 11290 93.4 1.606
-08.0 84 65.32 2777 2739 40444 11578 94.5 1.557
-06.0 86 66.74 2839 2864 43102 11852 95.5 1.511
-04.0 87 68.16 2901 2991 45931 12111 96.4 1.466
-02.0 89 69.58 2964 3120 48944 12352 97.2 1.423
+00.0 91 71.00 3026 3253 52152 12576 97.9 1.381 ! Near Maximum !
+02.0 93 72.42 3088 3387 55570 12781 98.5 1.341 ! Near Maximum !
+04.0 95 73.84 3149 3523 59213 12965 99.0 1.302 ! Near Maximum !
+06.0 97 75.26 3211 3662 63100 13129 99.4 1.265 !DANGEROUS LOAD-DO NOT USE!
+08.0 98 76.68 3272 3802 67249 13270 99.7 1.229 !DANGEROUS LOAD-DO NOT USE!
+10.0 100 78.10 3332 3945 71681 13388 99.9 1.194 !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 91 71.00 3184 3602 63172 12372 100.0 1.269 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 91 71.00 2813 2812 41488 12055 91.0 1.528


Here are the adjusted COAL's. I used 71 gr. just so the chart would show where you getting into an over-charge as well as 10%-12% below maximum. Like I said, if it were me...I would start around 68-69 gr. and work up from there.

There isn't an input for distance to the rifling that I've found in the program. I would guess it's that way because there's no way for the programmers to account for every variance in every chamber.

 

[carlazar]

Gus
Thanks a bunch, think I am ready for OCW test, interestingly mv lower on corrected seating figures than on original default OAL you sent earlier.

 

[carlazar]

Gus
Just to let you know, your prediction 71 gr was good, did the OCW test yesterday, started at :

69.8gr, 70.1gr, 70.6gr, 70.9gr , 71.2gr 71.5gr, 71.8gr , 72.1gr,

the last three loads had very similar poi and were closest to bullseye
71.5, 71.8, 72.1.

The poi of groups were all .698" from bullseye, in the same position, the middle group 71.8 gr being aclover leaf .256" sub moa@100yds no major pressure signs.
I will now further test the 71.8gr magpro with nosler accubonds 160gr. To confirm everything.
I am hoping mv will be in the 3040 to 3080 fps range.
Once again thanks for the help

 

[Gus McCrae]

Good to hear. Looks like you're on the right track.

I've found QL to be accurate estimating velocities with a couple of powders I use (IMR4350 & H335), and not so accurate with R22, so you never know. Of course every rifle is going to be unique.