I have a 1960? Heym double rifle in 375 H&H does anyone have any idea of the ammunition that was in use at that time the bullet weight and speed I talked to Chris at Heym and he thinks since the gun does not show and importer it was therefore imported before 1965. I am old but I was in high school at that time and I can find no reference material from that era.

If it is for the rimless magazine rifle cartridge I would try it with any factory loaded 300 grain ammo. Avoid the mono metal bullets like the barnes etc. You can go from there.

quote:

Originally posted by rnb:
I have a 1960? Heym double rifle in 375 H&H does anyone have any idea of the ammunition that was in use at that time the bullet weight and speed I talked to Chris at Heym and he thinks since the gun does not show and importer it was therefore imported before 1965. I am old but I was in high school at that time and I can find no reference material from that era.

375 H&H ammo has been pretty well consistant on the loaded Factory ammo since it's inception in 1912, and I would think that because the rifle was chambered for such an available ammo it was most likely regulated with common factory ammo with a 300 gr bullet. In other words you would be fine shooting factory ammo, as long as it is not loaded with the Mono-metal bullets. One of the best factory ammos is Remington "safari grade" loaded with 300 gr Nosler Partitions. The normal speed of the 375 H&H ammo with the 300 gr bullet is right at 2550 fps. your rifle should be safe with any 300 gr factory ammo made in the USA, again as long as it is not loaded with Monolithic bullets. Just try two or three brands,and use the one that regulates best!

Thanks for the help, there is always a learning curve when you start an new bad habit.

Following along with what Mac was saying, I have Win's Ammunition Handbook from the late 1950s and for the .375 H&H they were then selling three cartridges -

270 gr S.P., 2740 fps muzzle, 4500 ft lbs muzzle
300 gr S.T. Exp., 2550 fps muzzle, 4330 ft lbs muzzle
300 gr F.M.C., same ballistics as the S.T.

Not that it means anything, but the book was handed to me by Herb Parsons, Winchester's famous exhibition shooter.

The cartridge 375H&H was not very popular in this time in Germany. In my AKAH catalog from 1959/1960 i find only drillings, no HEYM DR's, and only ammunition caliber 375H&H from NORMA, 270grs and 300grs soft points !

MacD37,
Why not the mono metals....? S

quote:

Originally posted by SESOLINC:
MacD37,
Why not the mono metals....? S

There are a couple of Mono-metals you can safely use in double rifles, but they are not loaded in factory ammo as of today.

http://www.northforkbullets.com/magento/
Click on FAQ and much will be explained.

The reason you shouldn't use mono-metal bullets in a double is the barrels are usually quite thin on a double, and the length of the barrels are soldered to the barrel beside it, and the ribs between them. The mono-metal is very hard to engrave by the rifling, because the displaced metal engraved by the rifling has no place to go. There is phenomenon called OSR (Over Stressed Rifling) which amounts to the lands being swaged in the barrel so badly that it shows the pattern of the rifling on the outside of the barrels. The OSR is not the only damage that can occur from the use of improperly made mono-metal bullets. There are people that post on this sight that have had the solder joint between the barrels, and the wedges, and ribs broken loose by the use of improperly made mono-metal bullets as well.

The steel jacketed solid has a lead core, which allows the rifling to swage the bullet rather than the bullet swaging the barrel.

The two mono-metal bullets that are acceptable by most double rifle shooters are the GS Custom, made in RSA, and the North Fork CPS (Cup Point Solid), and the FPS (Flat Point Solid), these mono-metal bullets are made form softer COPPER, and have rings cut around the shank (Bearing surface) of the bullet that are slightly larger diameter that the Groove dia of the barrel to seal the gasses, but the valleys between the rings (Known as Pressure rings) are deeper so the rifling never touches the bottoms of those valleys. These bullets are even easier on the barrels that regular steel jacked solids with lead cores, and are acceptable in double rifle with proper bore, and lands!

Hope any of this is clearer than Mississippi mud!
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