Heym 55B O/U Double Rifle Regulation Ammo Question

[JimmyJack54]

I have a Heym 55B-SS Sidelock in 375 H&H (1978) and I am searching for what ammo it may have been regulated with and at what distance. If any of you happen to know or may be able to point me in the right direction it would be much appreciated.

 

[Hunter-Habib]

300Gr RWS KS (KegelSpitze) Cone Points & round nosed steel jacketed FMJ solids (by default).

You were also given the option to ask for 300Gr Winchester Silver Tips & flat nosed lubaloy jacketed FMJ solids.

I know this for a fact, because a very close friend actually ordered a Heym boxlock ejector side by side double rifle (chambered in .375 Holland & Holland Magnum) brand new in 1977.

These were the only 2 makes of .375 Holland & Holland Magnum ammunition which were commercially available back in those days (between 1973 and 1983). There was also Remington, but nobody liked to use them for regulating double rifles. Because the soft points (270Gr Core Lokts) and the solids (300Gr round nosed cupronickel jacketed FMJ) were of different weights.

 

[JimmyJack54]

Thank you @Hunter-Habib. Do you happen to know at what distance they used to regulate?

 

[Hunter-Habib]

Thank you @Hunter-Habib. Do you happen to know at what distance they used to regulate?

50 yards, @JimmyJack54

 

[flatwater bill]

@JimmyJack54 I'd be curious to know how far off other factory 300 grainers would be. If you have occasion to shoot some, please let us know..........FWB

 

[JimmyJack54]

50 yards, @JimmyJack54

Thank you.

 

[JimmyJack54]

@JimmyJack54 I'd be curious to know how far off other factory 300 grainers would be. If you have occasion to shoot some, please let us know..........FWB

FWB, I’m not sure when I’ll have time to make it to the range but I’ll let you know once I have a chance to acquire some ammo and shoot it.

 

[rookhawk]

I have a Heym 55B-SS Sidelock in 375 H&H (1978) and I am searching for what ammo it may have been regulated with and at what distance. If any of you happen to know or may be able to point me in the right direction it would be much appreciated.

Wolfgang Romey (extinct) could have been an option. Hirtenberger Austria was another option. (extinct load) RWS could have been an option (load extinct).

My first attempt would be GECO ammo to see if that will regulate. I would focus on 270gr loads as they were more fashionable at the time.

 

[JHT]

I have a Heym 55B-SS Sidelock in 375 H&H (1978).

Pics or it didn't happen

 

[JimmyJack54]

Pics or it didn't happen

 

[JimmyJack54]

Wolfgang Romey (extinct) could have been an option. Hirtenberger Austria was another option. (extinct load) RWS could have been an option (load extinct).

My first attempt would be GECO ammo to see if that will regulate. I would focus on 270gr loads as they were more fashionable at the time.

Thank you @rookhawk

 

[JHT]

View attachment 581413

Very nice. I lived in an old house once. I’m cold just looking at this pic.