NABLR 175 grain 7 mm Rem Mag and Retumbo Quickload

[pharmseller]

I'm using 73 grains of Retumbo and the 168 NABLR sparked by a WLRM for 2975 ft/sec MV. I got some 175 grain NABLR and I'd like to see how they fly using the same powder.

Anyone have some Quickload info for a Tikka T3 (24 3/8" barrel)?

Thanks,


P

 

[DrMike]

Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 175, Nosler AccuBond LR 58517 G7
Useable Case Capaci: 71.106 grain H2O = 4.617 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 24.4 inch = 619.1 mm
Powder : Hodgdon Retumbo

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 88 57.68 2332 2113 29583 11032 94.6 1.707
-18.0 90 59.12 2397 2232 31697 11378 95.9 1.661
-16.0 92 60.56 2462 2355 33973 11695 97.1 1.617
-14.0 94 62.01 2527 2480 36427 11982 98.1 1.573
-12.0 96 63.45 2591 2609 39073 12236 98.8 1.521
-10.0 98 64.89 2656 2741 41930 12454 99.4 1.470
-08.0 101 66.33 2720 2876 45017 12634 99.8 1.421
-06.0 103 67.77 2784 3012 48358 12774 100.0 1.374
-04.0 105 69.22 2847 3151 51975 12880 100.0 1.328 ! Near Maximum !
-02.0 107 70.66 2910 3291 55907 12978 100.0 1.284 ! Near Maximum !
+00.0 109 72.10 2972 3432 60176 13071 100.0 1.242 ! Near Maximum !
+02.0 112 73.54 3034 3576 64822 13159 100.0 1.201 !DANGEROUS LOAD-DO NOT USE!
+04.0 114 74.98 3095 3721 69889 13242 100.0 1.161 !DANGEROUS LOAD-DO NOT USE!
+06.0 116 76.43 3155 3869 75425 13319 100.0 1.123 !DANGEROUS LOAD-DO NOT USE!
+08.0 118 77.87 3216 4019 81485 13390 100.0 1.086 !DANGEROUS LOAD-DO NOT USE!
+10.0 120 79.31 3277 4172 88139 13454 100.0 1.050 !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 109 72.10 3100 3733 75327 12522 100.0 1.138 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 109 72.10 2773 2988 47690 13545 98.3 1.377

 

[DrMike]

If you're able to find them, there are some other powders that may serve you better than Retumbo.

Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 175, Nosler AccuBond LR 58517 G7
Useable Case Capaci: 71.106 grain H2O = 4.617 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 24.4 inch = 619.1 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60000 psi, or 413 MPa
or a maximum loading ratio or filling of 105 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

32 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Vihtavuori N570 105.0 72.6 4.70 2978 97.1 58594 14776 1.263 ! Near Maximum !
Alliant Reloder-33 105.0 75.6 4.90 2951 97.2 57522 14569 1.275 ! Near Maximum !
Norma MRP 2 104.5 68.5 4.44 2935 99.8 60000 13317 1.266 ! Near Maximum !
Alliant Reloder-26 93.6 65.9 4.27 2935 100.0 60000 12635 1.272 ! Near Maximum !
Vihtavuori N560 96.5 64.6 4.19 2928 99.4 60000 13312 1.256 ! Near Maximum !
Alliant Reloder-25 102.3 66.7 4.32 2924 100.0 60000 12330 1.254 ! Near Maximum !
Accurate MAGPRO 96.8 67.5 4.37 2924 98.6 60000 13478 1.264 ! Near Maximum !
Norma MRP 94.7 64.7 4.20 2923 100.0 60000 12801 1.264 ! Near Maximum !
IMR 7828 100.9 64.3 4.16 2920 99.6 60000 12889 1.245 ! Near Maximum !
IMR 7828 SSC 95.4 64.3 4.16 2920 99.6 60000 12889 1.245 ! Near Maximum !
Alliant Reloder-22 96.7 64.1 4.15 2901 100.0 60000 12705 1.263 ! Near Maximum !
Winchester WXR 99.3 64.4 4.17 2901 99.9 60000 12730 1.263 ! Near Maximum !
Hodgdon H1000 105.0 68.1 4.41 2889 99.7 58561 12583 1.253 ! Near Maximum !
Ramshot Magnum 96.8 69.1 4.48 2887 100.0 60000 12160 1.259 ! Near Maximum !
Alliant Reloder-19 93.9 61.5 3.99 2862 99.9 60000 12123 1.257 ! Near Maximum !
ReloadSwiss RS 80 105.0 74.7 4.84 2860 96.6 51886 14221 1.333 ! Near Maximum !
Alliant Reloder-23 98.8 63.4 4.11 2853 100.0 60000 11386 1.275 ! Near Maximum !
Hodgdon Retumbo 105.0 69.2 4.48 2847 100.0 51937 12878 1.328 ! Near Maximum !
Hodgdon H4831 99.1 63.1 4.09 2847 99.2 60000 12103 1.254 ! Near Maximum !
Hodgdon H4831 SC 95.3 63.1 4.09 2847 99.2 60000 12103 1.254 ! Near Maximum !
Winchester Supreme 780 92.9 64.2 4.16 2822 99.9 60000 11577 1.264 ! Near Maximum !
Vihtavuori N165 99.1 64.3 4.16 2813 100.0 60000 11316 1.270 ! Near Maximum !
Accurate 3100 96.9 63.5 4.12 2807 100.0 60000 11157 1.297 ! Near Maximum !
Vihtavuori N160 99.3 62.4 4.05 2804 99.5 60000 11429 1.261 ! Near Maximum !
IMR 4831 93.4 58.6 3.80 2803 100.0 60000 10860 1.283 ! Near Maximum !
Vihtavuori 24N41 105.0 73.3 4.75 2787 90.0 53808 12984 1.309 ! Near Maximum !
Hodgdon Hybrid 100V 91.4 57.9 3.75 2775 100.0 60000 10256 1.276 ! Near Maximum !
Vihtavuori N170 105.0 68.1 4.41 2740 94.4 53613 12233 1.344 ! Near Maximum !

 

[pharmseller]

Thanks for the data. I have 8# of Retumbo so I'm going to try it first.


P

 

[wayno945]

Mike, where did you get the RL26 data for your quickload software?

 

[DrMike]

Mike, where did you get the RL26 data for your quickload software?

The 19 Oct 2014 update has this data included.

 

[SJB358]

That's great looking data for a 7RM and 175... That'd be a heckuva combo for open country.

Pharm, where are you finding the ABLRs shooting for you in regards to the rifling?

 

[pharmseller]

That's great looking data for a 7RM and 175... That'd be a heckuva combo for open country.

Pharm, where are you finding the ABLRs shooting for you in regards to the rifling?

3.344" is still quite a ways from the lands. I'm loading for a Tikka so I'm constrained by the mag length.



P

 

[SJB358]

That's great looking data for a 7RM and 175... That'd be a heckuva combo for open country.

Pharm, where are you finding the ABLRs shooting for you in regards to the rifling?

3.344" is still quite a ways from the lands. I'm loading for a Tikka so I'm constrained by the mag length.



P

Have they been consistent for you each time out?

Also, any idea how far from the rifling you actually are?

 

[pharmseller]

That's great looking data for a 7RM and 175... That'd be a heckuva combo for open country.

Pharm, where are you finding the ABLRs shooting for you in regards to the rifling?

3.344" is still quite a ways from the lands. I'm loading for a Tikka so I'm constrained by the mag length.



P

Have they been consistent for you each time out?

Also, any idea how far from the rifling you actually are?

Yes, consistently close to an inch, .75 to 1, the difference is my fault I'm sure.

As far as distance to the lands I'm sorry, that data didn't survive.



P

 

[SJB358]

No sweat. It sounds like a sweetheart of a load.

 

[Guy Miner]

Used to drive the 175 Partition at 2930 fps via H870, which sadly, is no longer available.

A 7mm, 175 at 2900+ fps is a wonderful combo...

Guy