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 load for siamese mauser
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nam72
Starting Member

8 Posts

Posted - Nov 15 2007 :  17:49:12  Show Profile Send nam72 a Private Message  Reply with Quote
Does anyone out there have a good starting load for a siamese mauser?I thought about using the loads from a mauser 8mm to start but I would like something a little more definative.The cartridge by the way is 8x52R.

Rapidrob
Senior Member

USA
455 Posts

Posted - Aug 14 2017 :  10:10:05  Show Profile Send Rapidrob a Private Message  Reply with Quote
SIAMESE 8 x 52R mm TYPE 2466 (See note below)

Cartridge Cases and Primers Used for Load Development:
Cartridge Case: Remington (R-P) ... Reformed .45 / 70 brass ****
Cartridge Case Length: 2.037
Primers Used: Alcan Large Rifle 'Max-Fire' / CCI 200 Large Rifle / CCI BR2 Large Rifle / Federal 210 Large Rifle / Hertzers 120 Large Rifle / Remington 9 ½ Large Rifle / RWS 5341 Large Rifle / Winchester Large Rifle / Wolf Large Rifle

LOAD DATA

175 Grain
Sierra .323 175 grain Spitzer Soft-Point Flat-Base (SD: 240 BC: .381)
Overall Length: 2.980

(180 grain loads listed below can be used for this bullet)

180 Grain
Nosler .323 180 grain Spitzer Boat-Tail 'Ballistic Tip' (SD: .246 BC: .394)
Overall Length: 3.033 to 3.037
Nosler .323 180 grain Spitzer Boat-Tail 'Ballistic Silver Tip' (SD: .246 BC: .394)
Overall Length: 3.033 to 3.037
Barnes .323 180 grain Triple Shot X Spitzer Boat-Tail (SD: .246 BC: .381)
Overall Length: 2.975

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 … 40.5 to 40.7 grs. = 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
IMR 4166 ... Under Development
Hodgdon Varget … Under Development





196 Grain
Norma .323 196 grain Round Nose Soft-Point Flat-Base 'Alaska' (SD: ? BC: .305)
Overall Length: 2.850

IMR 4350 … 50.5 grs. = 2350 fps
IMR 4831 … 50.0 grs. = 2250 fps / 50.5 grs. = 2300 fps
Hodgdon H4831 … 53.3 grs. = 2250 fps / 53.7 grs. = 2300 fps
Hodgdon H4831 SC ... 53.3 grs. = 2250 fps / 53.7 grs. = 2300 fps

200 Grain
Nosler .323 200 grain Spitzer Boat-Tail 'AccuBond' (SD: .274 BC: .450)
Overall Length: 3.033 to 3.037
Nosler .323 200 grain Spitzer Soft-Point Flat-Base 'Partition' (SD: .274 BC: .426)
Overall Length: 3.033 to 3.037
Speer .323 200 grain Spitzer Soft-Point Flat-Base 'HotCore' (SD: .274 BC: .411)
Overall Length: 2.980

(196 grain loads listed above can be used for these bullets)

The Siamese Mauser Type 66 does not have a .323 bore. It is .327. While the rifles shoot the above listed loads well they do not work well beyond 200 yards. A .327 bullet shoots very well at long distance. The French Lebel MG 196 grain bullet can be used and shoots close to MOA. Privi 208 grain .329 bullets sized to .327 using a LEE die work very well also.
I have never seen even a hit of pressure problems and fired 50 rounds yesterday at 300 meters and was able to hold 2 MOA even with a hot barrel. The rifles are strong and the barrels are very accurate with the right load.
****
You do not HAVE to use .45-70 brass. All it does is aid in ejection,not extraction.
I have used 7.62x54R which will clear the action if the bolt is smartly cycled or 8x56R brass which works just fine.
The Russian reformed brass is one millimeter too short but have not caused any accuracy problems.
All three cases will have an hour glass shaped web when fired in the Siamese chamber. This does not cause any problems with case life.

Gulf of Tonkin Yacht Club
NRA Endowment Member
President NM MILSURPS

Edited by - Rapidrob on Aug 14 2017 10:16:20
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