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Big 7 vs Big 30 --- long range rifle cartridge selection

 
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  #1  
Old 11-28-2011, 05:27 PM
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Big 7 vs Big 30 --- long range rifle cartridge selection

I have a new rifle customer asking my opinion of what cartridge he should select from those I offer. I mentioned to him how I had surveyed my LRH members in a POLL for their opinion of favorite long range hunting cartridges. He indicated some interest in the 300 RUM and based on how he describes his needs I said either the 300 RUM or the 7 Dakota would serve him well.

Big 7 vs Big 30 --- long range rifle cartridge selection-cartridges-navigation.jpg

He asked me how the Dakota compares to the 300 RUM. I explained that I have been a proponent of the 7mm bullet caliber since Warren Page wrote about Remington's introduction of the 7mm RM in the 1962. My first bolt action rifle was in this cartridge a year or 2 later. I knew next to nothing about ballistics but simply reading the drop table and velocities told me the skinnier bullet retained velocity better than the 30-06 and had less drop as a result.

Anyway, the following is what I told Bryan in an email this morning.


Bryan

In order to select a cartridge for your new Long Range Rifles, LLC gun you asked me for a comparison of the ballistics between the 7 Dakota and the 300 RUM. Both are great cartridges and will do a fine job for your needs.

There are 4 images attached that show the velocity, wind drift, drop in minutes of angle, and energy.

The 300 RUM uses about 20 grains more powder for the 210 grain Berger vs the 180 grain Berger for the 7 Dakota. I used the 210 for the RUM comparison since that would perform the best at 1,000 yards over a lighter 30 caliber bullet.

I used an Excel spreadsheet that I developed to compare recoil. Recoil will be about 50% greater with the 300 RUM than with the 7 Dakota since the rifles weigh the same but the RUM has more powder, heavier bullet and same initial velocity.

So for 50% more recoil with the 300 RUM you get roughly the same ballistic performance except for higher energy with the 300 RUM -- which is so high with both cartridges that the difference in energy is academic.

Len

VELOCITY
Big 7 vs Big 30 --- long range rifle cartridge selection-7dvs300rum-veloc.jpg
.
DROP
Big 7 vs Big 30 --- long range rifle cartridge selection-7dvs300rum-drop-moa.jpg
.
WIND
Big 7 vs Big 30 --- long range rifle cartridge selection-7dvs300rum-wind-drift.jpg
.
ENERGY
Big 7 vs Big 30 --- long range rifle cartridge selection-7dvs300rum-energy.jpg
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  #2  
Old 11-28-2011, 06:51 PM
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Re: Big 7 vs Big 30 --- long range rifle cartridge selection

Using bulletflight fte I get a little higher energy numbers but very similar. I myself am struggling with this same decision. I went with a 7 rem mag in the end. The smith I'm using states I'll get around 3100 to 3150+ using 168 bergers in a 26" barrel. I have yet to prove to myself that that I can shoot out past 800 yards, which is where the 300 starts to matter on elk size game. After all the thinking I went with the 7 because after all the practice I will be less beat up. About the time I get truely competent out too 800+ the barrel will be running low on life. I figure then only after I have proved to myself that I need and can shoot out to a 1000 I will rebarrel to 300 RUM. The other thread I started dealing with this exact question is 300 RUM using 210/230 Berger vs a 7mm using 180 bergers going 3100 fps. The polls support the 300 but its closer than I thought if would be.
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Old 11-28-2011, 08:36 PM
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Re: Big 7 vs Big 30 --- long range rifle cartridge selection

I've never seen 7 Dakota ammo on the shelf at Walmart, Academy, or Cabelas.

I hand load, but it's nice to have the option of factory ammo in a pinch.

Is 300 RUM really 50% more recoil after installing a good brake?

I put a CSR brake on my 300WM and it went from painful to pleasant.

-- richard
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Old 11-28-2011, 08:46 PM
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Re: Big 7 vs Big 30 --- long range rifle cartridge selection

Richard, where I hunt 90% of the time I couldn't find any of the typical long range factory cartridges. And if I found some 300 RUM's to use that one as an example I wouldn't have much of a hunt anyway. Not sighted in, no good groups, no drop table.

So I've always thought that concern was overblown.

If you put a brake on BOTH rifles the recoil will still be 50% more.
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Old 11-28-2011, 08:56 PM
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Re: Big 7 vs Big 30 --- long range rifle cartridge selection

[QUOTE=Len Backus;574754]Richard, where I hunt 90% of the time I couldn't find any of the typical long range factory cartridges. And if I found some 300 RUM's to use that one as an example I wouldn't have much of a hunt anyway. Not sighted in, no good groups, no drop table.

So I've always thought that concern was overblown.

I tend to agree with this. The other thing to consider is I always bring a back up gun. In my situation it's a 300 wsm. But if you are really concerned with ammo your back up gun could be a highly common chambering a 270 win, 30-06 something like that. My primary shooter is a 7 rem mag so I really shouldn't have difficulty finding ammo for either but even if I had a 7 stw, 300 RUM or a 300-338 lapua improved as my primary rifle I wouldn't be much concerned
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Old 11-28-2011, 09:08 PM
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Re: Big 7 vs Big 30 --- long range rifle cartridge selection

Len,

Your post gives us a good, head to head comparison, but what are you asking us to reply about?
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  #7  
Old 11-28-2011, 09:20 PM
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Re: Big 7 vs Big 30 --- long range rifle cartridge selection

Just meant to be informational, no need to reply.
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