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7mm rum vs. 300 rum

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  #1  
Unread 12-28-2007, 02:31 PM
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7mm rum vs. 300 rum

Alright Pros,
I Am Buying A New Sendero Today. I Plan On Shooting The Factory Barrel Until I Get The Chance (money) To Do A Custom 30" Barrel. I Am Going To Have My Smith Do The Rest Of The Nicnacs Now. (jewel, Sako Extractor, Action Truing, Etc.). Still Cannot Decide On The Caliber. I Have Reloaded Some For The 300 Ultra And Have Not Had Any Problems With Accuracy. I Have Heard The The 7mm Rum Is A Little Finicky And Can Be Tricky To Get Accurate. Is This Just Another Uneducated Rumor Or Is There Something To This Claim? I Would Rather Go With The 7mm Because Of The Long Range Ballistics And Retained Energy But I Obviously Want To Hit Was Im Shooting At First. This Is My First Big Bore Long Range Project And I Want To Do It Right The First Time.

Thanks,
Ron
.243 Ackley, 22-250 Ackley(pop)
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  •   #2  
    Unread 12-28-2007, 02:35 PM
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    Nothing wrong witm 7RUM accuarcy! 1 VOTE UNEDUCATED RUMOR!
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      #3  
    Unread 12-28-2007, 02:43 PM
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    dont know about the rumor but the 30 caliber will give better performance longe range with the heavier bullets that need to be used for long range because 150gr bullet going 3500fps is not as good as a 200gr bullet going 3000fps and BC is everything
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      #4  
    Unread 12-28-2007, 03:15 PM
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    WHAT HAPPENS if you stuff a 200 grainer in a 7? Trump that apples to oranges 150 compared to a 200 grain thing, put em both up in the same bullet wieght class 7mm wins!
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      #5  
    Unread 12-28-2007, 03:29 PM
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    7mm Reply

    7mm ultra 180 gn vld 3000 fps .698 300 ultra 210 gn vld 3000fps .640
    500yds- 2346 ft lbs 32 in drp 2511 ft lbs 41 in drp
    1000- 1469 ft lbs 213 in drp 1412 ft lbs 278 in drp
    1300- 1084 ft lbs 430 in drp 973 ft lbs 576 in drp


    even assuming your only pushing the 7mm at the same velocity as the 300 is still smokes it. ft lbs seem not to be too different until you hit the extreme ranges but trajectory is not even close 7mm wins, and this is only with available berger bullets. The 7mm has a better BC, retained energy downrange, trajectory, velocity down range. (IT WINS)
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      #6  
    Unread 12-28-2007, 03:42 PM
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    Good comparison there but I was hoping you would do it on like a 200gr Wildcat! Verses a 210 for the 300.....
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      #7  
    Unread 12-28-2007, 04:46 PM
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    i'd vote for the 30. had a 7 and just didn't like it. to me, it's finicky. very overbore. if i had to choose, it'd be a 338! better than the other 2.
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