QL request 7x57

[salmonchaser]

132 gr Hammer HHT .284
24 inch barrel
Rl 17
H4350
3.140 coal
62k

I received my re barreled 275 Rigby last week. Been getting decent groups, 3/4 moa with factory spec ammo just going thru the break in process. Instead of going with the deep blue traditional Ruger #1 I had it Cearakoted with Midnight blue and bead blasted. Really happy with the results. Definitely makes it more of a working rifle than a show piece. That pic didn’t do justice, planning on a range day on Friday, I’ll try to set up a better pick.

 

[SJB358]

That looks excellent!

I’d bet somewhere around 51 for a starter. You’ll have a screamer on your hands.

 

[DrMike]

The 132 grain tipped bullet is not in my bullet inventory. I did a quick run with the 131 grain HH since you have to add the tip at this time. With the appropriate caveats, this should give you an idea of what is needed.

Cartridge          : 7 x 57 mm Mauser (SAAMI)
Bullet             : .284, 131, Hammer HH
Useable Case Capaci: 53.223 grain H2O = 3.456 cm³
Cartridge O.A.L. L6: 3.140 inch = 79.76 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Hodgdon H4350 *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   98    47.16   2731    2170   43100   8771     92.5    1.255
-09.0   99    47.68   2762    2220   44625   8880     93.1    1.236
-08.0  100    48.21   2794    2270   46203   8986     93.6    1.217
-07.0  102    48.73   2825    2321   47839   9089     94.1    1.198
-06.0  103    49.26   2856    2373   49529   9190     94.6    1.179
-05.0  104    49.78   2888    2426   51296   9287     95.0    1.161
-04.0  105    50.30   2919    2478   53121   9382     95.5    1.144  ! Near Maximum !
-03.0  106    50.83   2950    2532   55006   9473     95.9    1.126  ! Near Maximum !
-02.0  107    51.35   2982    2586   56956   9561     96.3    1.109  ! Near Maximum !
-01.0  108    51.88   3013    2640   58978   9646     96.7    1.093  ! Near Maximum !
+00.0  109    52.40   3044    2695   61075   9728     97.1    1.076  ! Near Maximum !
+01.0  110    52.92   3075    2751   63251   9805     97.4    1.060  !DANGEROUS LOAD-DO NOT USE!
+02.0  111    53.45   3106    2807   65509   9879     97.7    1.044  !DANGEROUS LOAD-DO NOT USE!
+03.0  112    53.97   3138    2864   67853   9950     98.0    1.029  !DANGEROUS LOAD-DO NOT USE!
+04.0  114    54.50   3169    2921   70288  10016     98.3    1.013  !DANGEROUS LOAD-DO NOT USE!
+05.0  115    55.02   3200    2979   72818  10078     98.6    0.998  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    109    52.40   3121    2833   66924   9742     98.9    1.036  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    109    52.40   2956    2542   55306   9599     94.3    1.122  ! Near Maximum !


Cartridge          : 7 x 57 mm Mauser (SAAMI)
Bullet             : .284, 131, Hammer HH
Useable Case Capaci: 53.223 grain H2O = 3.456 cm³
Cartridge O.A.L. L6: 3.140 inch = 79.76 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-17 *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   93    47.75   2845    2354   42494   9781     98.5    1.246
-09.0   94    48.28   2878    2409   44052   9866     98.8    1.225
-08.0   95    48.81   2911    2465   45671   9945     99.1    1.205
-07.0   96    49.34   2944    2522   47353  10018     99.3    1.186
-06.0   97    49.87   2978    2579   49099  10085     99.5    1.166
-05.0   98    50.40   3010    2636   50915  10146     99.7    1.148
-04.0   99    50.93   3043    2694   52802  10200     99.8    1.129  ! Near Maximum !
-03.0  100    51.46   3076    2752   54757  10248     99.9    1.111  ! Near Maximum !
-02.0  101    51.99   3108    2810   56804  10288    100.0    1.093  ! Near Maximum !
-01.0  102    52.52   3140    2869   58928  10323    100.0    1.076  ! Near Maximum !
+00.0  103    53.05   3172    2928   61137  10353    100.0    1.059  ! Near Maximum !
+01.0  104    53.58   3204    2987   63440  10383    100.0    1.042  !DANGEROUS LOAD-DO NOT USE!
+02.0  105    54.11   3236    3046   65838  10411    100.0    1.026  !DANGEROUS LOAD-DO NOT USE!
+03.0  106    54.64   3268    3106   68338  10439    100.0    1.010  !DANGEROUS LOAD-DO NOT USE!
+04.0  107    55.17   3299    3166   70944  10466    100.0    0.994  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    55.70   3330    3226   73655  10491    100.0    0.978  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    103    53.05   3244    3061   67915  10101    100.0    1.016  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    103    53.05   3083    2765   54855  10567     99.4    1.108  ! Near Maximum !

 

[salmonchaser]

Thanks Dr. Mike. Looks like a screamer.