Looking for 7.7Jap load w/Lee 160 .312 cast boolit

[Scooter22]

My son's been bugging me to shoot a nice Type 99 I have. We already shoot other WWII rifles we have except for this one. I prepped and primed 60 cases and I have some of the 160 grns but only find data for 150 or 180 grn boolits. We don't plan on shooting this much. Just want to try it so I don't want a dedicated mold if i don't have to. Any suggestions would be appreciated. Thanks.

 

[ewlyon]

I would use the data for the 180gr bullet (assuming it is cast data and the powder is not sensitive to reduce loads)

 

[LoonWulf]

I dont shoot cast from my 7.7 so cant realy help beyond seeing what quickloads has for it.
What powders are you using?

 

[Scooter22]

That would be great. I have IMR-4895, IMR-4198. I have a couple pounds Lil gun that may be usefull in a light load. Thanks for the offer.

 

[LoonWulf]

Cartridge : 7.7 mm x 58 Japan (Arisaka)
Bullet : .312, 160, LEE CTL312-160-2R
Useable Case Capaci: 55.077 grain H2O = 3.576 cm³
Cartridge O.A.L. L6: 2.874 inch = 73.00 mm
Barrel Length : 25.0 inch = 635.0 mm
Powder : IMR 4198

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 53 24.00 1839 1164 15279 4123 92.9 2.032
-18.0 54 24.60 1878 1214 16105 4247 93.8 1.981
-16.0 55 25.20 1917 1265 16976 4368 94.7 1.932
-14.0 57 25.80 1955 1316 17875 4485 95.5 1.885
-12.0 58 26.40 1994 1368 18809 4599 96.2 1.840
-10.0 59 27.00 2031 1420 19779 4710 96.8 1.798
-08.0 61 27.60 2069 1473 20785 4816 97.4 1.756
-06.0 62 28.20 2106 1527 21831 4918 98.0 1.717
-04.0 63 28.80 2143 1580 22915 5017 98.4 1.679
-02.0 65 29.40 2179 1635 24040 5110 98.8 1.642
+00.0 66 30.00 2215 1689 25207 5199 99.2 1.607
+02.0 67 30.60 2251 1744 26414 5284 99.5 1.573
+04.0 69 31.20 2286 1799 27671 5364 99.7 1.541
+06.0 70 31.80 2321 1854 28971 5438 99.8 1.510
+08.0 71 32.40 2355 1909 30320 5508 99.9 1.479
+10.0 72 33.00 2389 1964 31717 5573 100.0 1.450

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 66 30.00 2302 1825 29666 5055 100.0 1.501
Data for burning rate decreased by 10% relative to nominal value:
-Ba 66 30.00 2094 1509 21011 5105 94.5 1.744

 

[LoonWulf]

Cartridge : 7.7 mm x 58 Japan (Arisaka)
Bullet : .312, 160, LEE CTL312-160-2R
Useable Case Capaci: 55.077 grain H2O = 3.576 cm³
Cartridge O.A.L. L6: 2.874 inch = 73.00 mm
Barrel Length : 25.0 inch = 635.0 mm
Powder : IMR 4895

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 55 28.00 1619 902 10498 3826 68.7 2.432
-18.0 57 28.70 1660 949 11105 3993 70.2 2.378
-16.0 58 29.40 1702 997 11743 4160 71.6 2.325
-14.0 59 30.10 1743 1046 12411 4329 73.1 2.263
-12.0 61 30.80 1785 1097 13112 4498 74.5 2.202
-10.0 62 31.50 1827 1149 13847 4668 75.9 2.145
-08.0 63 32.20 1869 1202 14618 4837 77.2 2.089
-06.0 65 32.90 1911 1257 15421 5006 78.5 2.036
-04.0 66 33.60 1953 1313 16273 5175 79.8 1.984
-02.0 68 34.30 1996 1371 17161 5342 81.1 1.934
+00.0 69 35.00 2038 1429 18085 5509 82.3 1.886
+02.0 70 35.70 2080 1489 19060 5674 83.5 1.840
+04.0 72 36.40 2122 1550 20082 5837 84.7 1.796
+06.0 73 37.10 2164 1612 21159 5998 85.8 1.752
+08.0 74 37.80 2207 1676 22282 6157 86.9 1.711
+10.0 76 38.50 2249 1740 23458 6314 87.9 1.671

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 69 35.00 2193 1655 22233 5960 90.8 1.720
Data for burning rate decreased by 10% relative to nominal value:
-Ba 69 35.00 1859 1190 14540 4851 71.4 2.092

 

[LoonWulf]

Cartridge : 7.7 mm x 58 Japan (Arisaka)
Bullet : .312, 160, LEE CTL312-160-2R
Useable Case Capaci: 55.077 grain H2O = 3.576 cm³
Cartridge O.A.L. L6: 2.874 inch = 73.00 mm
Barrel Length : 25.0 inch = 635.0 mm
Powder : Hodgdon Lil'Gun

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 36 19.20 1744 1047 13782 3534 100.0 2.225
-18.0 37 19.68 1777 1087 14521 3598 100.0 2.169
-16.0 38 20.16 1810 1127 15285 3661 100.0 2.117
-14.0 39 20.64 1842 1167 16075 3724 100.0 2.067
-12.0 40 21.12 1873 1207 16890 3786 100.0 2.019
-10.0 41 21.60 1904 1247 17731 3848 100.0 1.973
-08.0 42 22.08 1934 1288 18598 3910 100.0 1.929
-06.0 43 22.56 1964 1328 19492 3972 100.0 1.887
-04.0 44 23.04 1994 1368 20412 4034 100.0 1.847
-02.0 45 23.52 2023 1408 21360 4095 100.0 1.809
+00.0 45 24.00 2051 1448 22335 4156 100.0 1.772
+02.0 46 24.48 2080 1489 23338 4216 100.0 1.737
+04.0 47 24.96 2108 1529 24370 4276 100.0 1.703
+06.0 48 25.44 2135 1569 25430 4336 100.0 1.670
+08.0 49 25.92 2163 1610 26520 4396 100.0 1.639
+10.0 50 26.40 2190 1650 27640 4455 100.0 1.608

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 45 24.00 2106 1527 26290 4043 100.0 1.654
Data for burning rate decreased by 10% relative to nominal value:
-Ba 45 24.00 1969 1334 18308 4319 100.0 1.933

 

[LoonWulf]

again with no experience loading cast bullets in the 7.7, or any other big bottle necked cartridge for that matter, I dont have my opinion or even know how realistic the numbers generated are.

 

[nambu1]

My 1970 copy of Lyman reloading list a 155 gr. cast using 11.0 to 15.0 gr. of Unique or 22.0 to 24.0 gr. of 2400.

 

[Scooter22]

Thank you!. I'll sort through this data. I've seen a lot of info on Quickloads being used. Looks like a great tool to find a load for the components on hand. I only need a light load just to try shooting this rifle.

 

[Curator]

20 grains of IMR4198 should give you about 1600 fps with a 160 grain bullet. Despite Lyman's load data, 1600 fps is about as fast as a cast bullet can be driven and give good accuracy in a .30 caliber military rifle. Arisakas are known for larger than specifications bores so .312" diameter may be on the small size for best results. I get my best accuracy with my Type 99s using a .314" diameter bullet cast of linotype (BHN22) using 16 grains of Alliant 2400.

 

[Scooter22]

Thanks for the added info.