Japanese Militaria at Castle-Thunder.com

[1886lebel]

Top: Siamese 8 x 50R mm Type 2445
Bottom: Siamese 8 x 52R mm Type 2466



Siamese 8 x 50R mm Type 2445

Original Cartridge:
Case Length ... 1.983 / 50.3682 mm
Overall Length ... 2.970 / 75.4380 mm
Rim Diameter: .560
Rim Thickness: .055
Base Diameter: .498
Neck Diameter: .348


Original Bullet Diameter: .321 Diameter; 239 grain
Lead-Core, Cupro-Nickel Jacket, Flat-Based Round Nose Bullet
Original Propellant Load:
37 grains of unknown size Black Powder *Early Load
34 grains of unknown flat square flake or tubular type powder
Original Ballistic Data: FPS: 2050 / MPS: 625


LOAD DATA
Woodleigh .323 220 grain Flat-Base Round Nose Soft Point (SD: .301 BC: .355)
HAWK .323 220 grain Flat-Base Round Nose Soft Point
(These bullets are the closest to the original bullet used)
Overall Length: 2.970

IMR 4064 ... 42.0 grs. = 2050 fps / 625 mps
IMR 4320 ... 42.5 grs. = 2050 fps / 625 mps
IMR 4350 ... 47.7 grs. = 2050 fps / 625 mps
IMR 4831 ... 53.0 grs. = 2050 fps / 625 mps
IMR 4895 ... 41.0 grs. = 2050 fps / 625 mps

* All loads are 1 MOA to 3 MOA at 100 Yards


Cartridge Cases and Primers Used for Load Development:

Case: Remington; Reformed by Buffalo Arms from .45 / 70 brass
Primers Used: Winchester Large Rifle
Remington 9 ½ Large Rifle
CCI Large Rifle


Siamese 8 x 52R mm Type 2466

Original Cartridge:
Case Length: 2.047 / 51.9938 mm
Overall Length: 2.941 / 74.70 mm
Rim Diameter: .560
Rim Thickness: .065
Base Diameter: .506
Neck Diameter: .348

Original Bullet Specifications: .321 Diameter; 181 grain
Lead-Core, Cupro-Nickel Jacket, Flat-Based Spitzer Bullet
Original Overall Length: 2.940 to 2.955
Original Propellant Load: 37 grains of unknown tubular type powder
Original Ballistic Data: Feet per Second (FPS): 2250


LOAD DATA

Sierra .323 175 grain Spitzer Soft-Point Flat-Base (SD: 240 BC: .381)
Overall Length:
(180 grain loads listed below can be used for this bullet)

Nosler .323 180 grain Spitzer Boat-Tail 'Ballistic Tip' (SD: .246 BC: .394)
Nosler .323 180 grain Spitzer Boat-Tail 'Ballistic Silver Tip' (SD: .246 BC: .394)
(These bullets are the closest to the original bullet used)
Overall Length: 3.033 to 3.037

IMR 3031 ... 38.5 to 38.7 grs. = 2250 fps
IMR 4064 ... 40.5 to 40.7 grs. = 2250 fps
IMR 4320 ... 42.5 to 42.7 grs. = 2250 fps
IMR 4895 ... 42.3 to 42.5 grs. = 2250 fps
Alliant RL 15 ... 39.2 to 39.5 grs. = 2250 fps
Hodgdon BLC (2) ... 40.0 to 40.2 grs. = 2250 fps
Hodgdon H335 … Under Development = 2250 fps
Hodgdon Varget … Under Development = 2250 fps
Norma 201 … 40.5 to 40.7 grs. = 2250 fps
Ramshot TAC ... 40.5 to 40.7 grs. = 2250 fps
Winchester 748 ... 40.0 to 40.2 grs. = 2250 fps

Norma .323 196 grain Round Nose Soft-Point Flat-Base 'Alaska' (BC: .305)
Overall Length: 2.850
IMR 4350 … 50.5 grs. = 2345 fps
IMR 4831 … Under Development
Hodgdon H4831 … Under Development

Nosler .323 200 grain Spitzer Boat-Tail 'AccuBond' (SD: .274 BC: .450)
Overall Length: 3.033 to 3.037
Speer .323 200 grain Spitzer Soft-Point Flat-Base 'HotCore' (SD: .274 BC: .411)
Overall Length:
(196 grain loads listed above can be used for these bullets)

* All loads are 1 MOA to 3 MOA at 100 Yards

Cartridge Cases and Primers Used for Load Development:
Case: Remington; Reformed by Buffalo Arms from .45 / 70 brass
Primers Used:
CCI 200 Large Rifle
Federal 210 Large Rifle
Remington 9 ½ Large Rifle
RWS 5341 Large Rifle
Winchester Large Rifle
Wolf Large Rifle

Case: Kynoch; 1950 dated military
Primer Used:
PMC Large Rifle Berdan Primer (.217”)

Each test load was fired in two successive five-shot strings from a front rest at a range of 100 yards using a Beta Master Shooting Chrony® chronograph which was located 15 feet ahead of the muzzle to measure the velocity of the bullet.
All test loads above were developed at the Albuquerque Shooting Range Park which is located at an elevation of 6,009 feet above sea level.

"All reloading data contained in the following article is to be use at your own risk and any failures, mishaps resulting from this data will not be directed towards the original author(s) / writer(s), or publisher.”
“USE AT YOUR OWN RISK"


METRIC LOAD INFORMATION

Original Bullet Specifications: 8,15 mm Diameter; 11,72 gram
Lead-Core, Cupro-Nickel Jacket, Flat-Based Spitzer Bullet
Original Overall Length: 74,70 to 75,05 mm
Original Propellant Load: 2,39 gram of unknown tubular type powder
Original Ballistic Data: Meters per Second (MPS): 685

LOAD DATA

Sierra 8,20 mm 11,34 g Spitzer Soft-Point Flat-Base
Overall Length:
(11,66 gram loads listed below can be used for this bullet)

Nosler 8,20 mm 11,66 g Spitzer Boat-Tail 'Ballistic Tip'
Nosler 8,20 mm 11,66 g Spitzer Boat-Tail 'Ballistic Silver Tip'
(These bullets are the closest to the original bullet used)
Overall Length: 77,03 to 77,13 mm

IMR 3031 ... 2,49 to 2,50 g = 685 mps
IMR 4064 ... 2,62 to 2,63 g = 685 mps
IMR 4320 ... 2,75 to 2,76 g = 685 mps
IMR 4895 ... 2,74 to 2,75 = 685 mps
Alliant RL 15 ... 2,54 to 2,55 g = 685 mps
Hodgdon BLC (2) ... 2,59 to 2,60 g = 685 mps
Hodgdon H335 … Under Development = 685 mps
Hodgdon Varget … Under Development = 685 mps
Norma 201 … 2,62 to 2,63 g = 685 mps
Ramshot TAC ... 2,62 to 2,63 g = 685 mps
Winchester 748 ... 2,59 to 2,60 g = 685 mps

Norma 8,20 mm 12,70 g Round Nose Soft-Point Flat-Base 'Alaska'
Overall Length: 72,39 mm
IMR 4350 … 3,27 g = 715 mps
IMR 4831 … Under Development
Hodgdon H4831 … Under Development

Nosler 8,20 mm 12,96 g Spitzer Boat-Tail 'AccuBond'
Overall Length: 77,03 to 77,13 mm
Speer 8,20 mm 12,96 g Spitzer Soft-Point Flat-Base 'HotCore'
Overall Length:
(12,70 gram loads listed above can be used for these bullets)

* All loads are 1 MilRad to 3 MilRad at 91,44 Meters

Cartridge Cases and Primers Used for Load Development:
Case: Remington; Reformed by Buffalo Arms from .45 / 70 brass
Primers Used:
CCI 200 Large Rifle
Federal 210 Large Rifle
Remington 9 ½ Large Rifle
RWS 5341 Large Rifle
Winchester Large Rifle
Wolf Large Rifle

Case: Kynoch; 1950 dated military
Primer Used:
PMC Large Rifle Berdan Primer (5,51 mm)

Each test load was fired in two successive five-shot strings from a front rest at a range of 91,44 meters using a Beta Master Shooting Chrony® chronograph which was located 4,57 meters ahead of the muzzle to measure the velocity of the bullet.
All test loads above were developed at the Albuquerque Shooting Range Park which is located at an elevation of 1,832 meters above sea level.

"All reloading data contained in the following article is to be use at your own risk and any failures, mishaps resulting from this data will not be directed towards the original author(s) / writer(s), or publisher.”
“USE AT YOUR OWN RISK"