7mm remington magnum

[Bobby Ironsights]

So, I was looking at some ballistics tables after seeing an EE ad for a 7mm rem magnum, and I noticed that the velocity is good, yet the cartridge is slower with 150 grain bullets than the parent case is with 200 grain bullets, the 375 H&H.

What the hell is up with that?

 

[employee]

I could be wrong but I thought the parent case was the 416 Remington Magnum.. Look at the case measurements they are closer than a 375 H&H but I have been wrong before.

I don't know the answer to your question but in my manual it looks like 160 gr in the 7mm is about par with the 235gr in the 375 for muzzle velocity, I imagine the 375 drops a lot faster in both velocity as well as in its trajectory though.

Good question... I would think it has to do with the BC but yeah no I have no idea... Brain still damaged from holiday festivities.

 

[Gatehouse]

You are kinda mixing apples and oranges.

The 7RM is a shortened and blown out 375 H&H. The 2 cases only resemble each other at the case head/belt area, and the H&H will hold more powder.

Furthermore, your example of the 200 gr .375 bullet vs the 150gr .284 bullet is a little misleading. The larger diameter of the .375 bullet means more surface area for the expanding gas to push against, so more velocity in the short term. But the 150gr 7mm bullet has a BC than a 200 gr 375 bullet, so you are going to see better down range performance with the 7mm.

Furthermore, the SD of a 150gr bullet is about the same as a 260-270gr .375 bullet. So if you want to compare apples to apples, you will see that the 150gr 7mm and 270 gr.375 buellts with similar SD and BC go about the same speed- around 3000 fps

 

[Foxer]

I doubt you'll find the animals any less dead with the 7mm

 

[senior]

Any time you take two cartridges of the same dimensions & neck one down, such as 30-06 & the 270, you end up with inferior performance in the smaller bore due to less efficiency. Eg a 270 will never shoot a 150gn bullet as fast as a 30-06. Straight cases are some of the most efficient calibers we have, look at the old .44mag in regards to bullet weight, speed & amount of powder required to accomplish what it does.

 

[H4831]

Foxer, you are on the right track. I remember reading a Jack O'Connor article, where he stated how many hundred head of a wide variety of big game, that he had either shot, or seen shot, with each of a 7 x 57 and a 7mm Remington Magnum. He stated that he could not really see any difference in killing power, between the two calibres! Good hit, dead animal. Poor hit, wounded animal.

 

[senior]

True 4831 but the 7rem gives you a little added margin for mistake in range estimation.

Curious just why you picked your handle H4831?? Are you as good as the powder your named after