Quick Load Help for PSI..Someone Please

26 November 2013, 05:46

I am wondering if someone here would be kind enough to do a Quick Load for me so that I can know what my PSI is. There are NO signs of
excessive pressure but since I am getting 3,084FPS with a 168gr bullet it sounds too good to be true!

7mm Remington Mag with 26" Benchmark 5R Barrel
168gr Nosler Accubond Lr's 50/1000 off lands
71gr of Reloader#25

I also tried a Max load 79.5gr of Reloader#33
and it was even faster at 3,114FPS, but what bothers me is that it is a 106.2% compression load and I had to screw my die down 3 times to finally seat each bullet, so I am apprehensive about using it. My bullets didn't "Grow" over a few days until I shot them, but I wonder what will happen in extreme temps.

Which way would you go and any advice is appreciated!

BTW They are both equally accurate so I rule accuracy out of my choice.

27 November 2013, 16:46

steve4102

Nosler and Alliant list 70gr of R-25 as max for their 160gr bullet. You are over by a full grain with a heavier 168gr bullet.

QL is not magic and is only an educated guess, here is what it says about your load. If this were my load and My rifle I would consider this QL calculation Accurate.

 Cartridge          : 7 mm Rem. Mag.(CIP)
Bullet             : .284, 168, Nosler Accubond LR 58623
Cartridge O.A.L. L6: 3.290 inch or 83.57 mm
Barrel Length      : 26.0 inch or 660.4 mm
Powder             : Alliant Reloder-25

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    56.80   2507    2344   32576  10534     98.4    1.679
-18.0   85    58.22   2568    2461   34858  10769     99.0    1.634
-16.0   87    59.64   2630    2579   37302  10977     99.5    1.589
-14.0   89    61.06   2690    2700   39923  11157     99.9    1.538
-12.0   91    62.48   2751    2822   42735  11307    100.0    1.490
-10.0   93    63.90   2810    2945   45754  11432    100.0    1.443
-08.0   95    65.32   2869    3070   48997  11553    100.0    1.399
-06.0   98    66.74   2927    3195   52485  11670    100.0    1.356
-04.0  100    68.16   2984    3321   56237  11784    100.0    1.314  ! Near Maximum !
-02.0  102    69.58   3041    3449   60279  11895    100.0    1.274  ! Near Maximum !
+00.0  104    71.00   3097    3578   64636  12001    100.0    1.236  !DANGEROUS LOAD-DO NOT USE!
+02.0  106    72.42   3153    3708   69299  12104    100.0    1.199  !DANGEROUS LOAD-DO NOT USE!
+04.0  108    73.84   3208    3840   74296  12202    100.0    1.164  !DANGEROUS LOAD-DO NOT USE!
+06.0  110    75.26   3264    3973   79666  12296    100.0    1.130  !DANGEROUS LOAD-DO NOT USE!
+08.0  112    76.68   3319    4108   85441  12386    100.0    1.097  !DANGEROUS LOAD-DO NOT USE!
+10.0  114    78.10   3374    4245   91663  12470    100.0    1.065  !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    71.00   3200    3820   79176  11592    100.0    1.144  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    71.00   2938    3221   51204  12582     99.9    1.360

27 November 2013, 17:28

Leopardtrack

Thanks Steve!

I am definitely going to back off to 70gr
Too good to be true, but I know allot of guys that go over max saying that for liability sake the max psi is low.

I am getting 3,114 anyway with 79.5gr of RL-33 but it is a 106.2% compressed load so I was trying out other options. My bullets are not"growing" out of the cases so I think I am OK with it...I put a few in the freezer then in the sun and back to room temp and got same COAL so guess it's ok

What would you do if it were your gun??

27 November 2013, 19:00

steve4102

quote:
What would you do if it were your gun??

Shoot it. You are still under 65K and I see little reason to bring any handload in a modern action rifle down to 60K or less when 65K is accepted for many a cartridge.

27 November 2013, 20:26

ramrod340

If the load was accurate and I had no pressure signs I would keep it. Check to make sure I don't have a real short case life.

QL is simply another data point. I have a several loads that are a gr or two above book max.

27 November 2013, 20:43

SR4759

Check case life by loading a couple at least 10 times. If the primer pocket stays tight your load is ok for that lot of brass.

27 November 2013, 21:22

Leopardtrack

That's great news for me fellas!

I am going to shoot it a bit more then and see what happens with cases

I am getting 3,114fps with 79.5gr of RL-33 so I have two good prospects to mess with

28 November 2013, 18:30

steve4102

quote:
Originally posted by Leopardtrack:
That's great news for me fellas!

I am going to shoot it a bit more then and see what happens with cases

I am getting 3,114fps with 79.5gr of RL-33 so I have two good prospects to mess with

 Cartridge          : 7 mm Rem. Mag.(CIP)
Bullet             : .284, 168, Nosler Accubond LR 58623
Cartridge O.A.L. L6: 3.290 inch or 83.57 mm
Barrel Length      : 26.0 inch or 660.4 mm
Powder             : Alliant Reloder-33

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   84    63.60   2363    2083   27894  10651     83.8    1.790
-18.0   86    65.19   2434    2210   29991  11086     85.7    1.740
-16.0   88    66.78   2505    2342   32268  11512     87.5    1.691
-14.0   90    68.37   2578    2479   34741  11923     89.2    1.643
-12.0   93    69.96   2651    2622   37432  12319     90.8    1.591
-10.0   95    71.55   2725    2770   40361  12695     92.4    1.535
-08.0   97    73.14   2800    2924   43561  13050     93.8    1.480
-06.0   99    74.73   2875    3083   47055  13380     95.0    1.427
-04.0  101    76.32   2950    3247   50881  13683     96.2    1.375
-02.0  103    77.91   3026    3417   55079  13955     97.2    1.325  ! Near Maximum !
+00.0  105    79.50   3103    3591   59689  14195     98.0    1.278  ! Near Maximum !
+02.0  107    81.09   3179    3770   64775  14398     98.7    1.231  !DANGEROUS LOAD-DO NOT USE!
+04.0  109    82.68   3255    3953   70392  14563     99.3    1.186  !DANGEROUS LOAD-DO NOT USE!
+06.0  112    84.27   3332    4141   76577  14688     99.7    1.143  !DANGEROUS LOAD-DO NOT USE!
+08.0  114    85.86   3408    4333   83395  14769     99.9    1.101  !DANGEROUS LOAD-DO NOT USE!
+10.0  116    87.45   3485    4530   90945  14805    100.0    1.060  !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    105    79.50   3291    4039   75749  13824    100.0    1.160  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    105    79.50   2845    3018   46241  13509     90.0    1.430

28 November 2013, 21:06

Ackley Improved User

quote:
Originally posted by SR4759:
Check case life by loading a couple at least 10 times. If the primer pocket stays tight your load is ok for that lot of brass.

SR4759, just curious, why 10 times? Why not 5 or 3 or...whatever? AIU

28 November 2013, 21:17

Leopardtrack

Steve thanks so much for that!

That's great news for me...over 3,100fps and not even near 62,000psi....faster than the RL-25 with allot less pressure. I am going to see what I can do and try to use the 33 instead of 25.

The 33 is a 106.2% compression load but my bullets are not "growing" from the case neck and I even put a few in the freezer, then in the sun for an hour and when I brought them back in the house and back to room temp, I measured them and they were the same COAL from when I loaded them....so hopefully I'm OK.

This is why I resisted getting into Reloading! I knew that I would become obsessed with it and this is exactly what happened...putting rounds in the freezer! I am having a good time however!

Would you go with the 33 or play around a bit with both?

Happy Thanksgiving to you ALL!

Frank