What is the difference between these cases?

I read in my Speer manual that the 416 Remington Magnum is based on the 8 mm Remington Magnum case, but isn't the 8 mm based on the 375? Why did Remington use 8 mm brass? Were they not making any 375 brass at the time?

Just curious.

H. C.

Henry,

Remington based their 8mm RM design on the .375 H&H case, but removed a lot of body taper and used a sharper 25 degree shoulder.

They then used this case for the .416 RM, keeping the blown-out body and 25 degree shoulder angle. They were in fact making both .375 H&H and 8mm RM brass and cartridges at that time.

jim dodd

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"if you are to busy to
hunt, you are too busy."

As HunterJim said, the 8mm Rem. Mag. is made on what can be described as a vastly "improved" .375 H&H magnum caase. It is close to a .300 Weatherby, except for the "regular" shoulder style vs the venti-shoulder typical of Weatherby designs. Since it arrived, the 8mm Rem. has been wildcatted all over the place by necking it up, down & sidways!! The .416 Rem. is an example of this, as is the .358 JRS, .358 STA, 7mm STW, .257 STW, and some others.