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Perfect Bullet Weight/Velocity Combination

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Unread 12-25-2003, 08:11 PM
Silver Member
Join Date: Nov 2001
Location: tennessee
Posts: 480
Re: Perfect Bullet Weight/Velocity Combination

An interesting side note is that the .338 RUM shoots faster and flatter than the .300

RUM, even when shooting heavier bullets, and with less recoil! This begs the question, why would anyone EVER want a .300 RUM? Are the .30 caliber bullets that much better than the .338 bullets? (mark)

Thats wrong.
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Unread 12-25-2003, 08:14 PM
Gold Member
Join Date: Sep 2002
Location: Illinois
Posts: 837
Re: Perfect Bullet Weight/Velocity Combination

Merry Christmas everyone.
Brent, I was refering to caliber, but I guess cartridge is very much involved. Maybe I could ask bullet/velocity combination per bbl dia.
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Unread 12-30-2003, 02:04 PM
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Join Date: Jul 2003
Location: Bountiful, Utah
Posts: 71
Re: Perfect Bullet Weight/Velocity Combination

As to the .300 RUM vs. .338 RUM question, examples are based upon a 200 yard zero and all availableload data that I have. I ran these calculations back when I was debating over .300 Win, .300 RUM, .338 Win, and .338 RUM. The results were interesting and eye-opening for me, to say the least!

.300 RUM, 200 grain XFB, BC = .550, 104 grains H870, 3028 fps, 17.2" drop at 400 yards.

.338 RUM, 200 grain Ballistic Tip (sorry not exactly the same bullet), BC = .414, 88.7 grains IMR 4831, 3160 fps, 16.8" drop at 400 yards.

The .338 RUM in this case is faster and shoots flatter at 400 yards than the .300. At extreme ranges the higher BC of the 200 grain .300 will start to do better, but then if you want to go to longer ranges you'd go up to a 250 or 300 grain pill in the .338. My .338 RUm can do +3200 fps using 225 grain bullets, and +3100 fps using 250 grain bullets, so I'm not surprised by the results.

As for recoil, plug the above loads in and see where they fall. The .338 is slightly easier on the shoulder, which is counter-intuitive. The higher powder loads in the .300 create the higher recoil numbers, even if you use heavier bullets!

If my calculations are wrong, or if someone has any better information, let me know, I'm all ears!

Mark in Utah
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Unread 12-30-2003, 08:49 PM
Platinum Member
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,740
Re: Perfect Bullet Weight/Velocity Combination

According to my calculations, the differance between the 2 examples you gave, except I used a 300 yard zero was like this:

300 RUM -9.68 @ 400 yards w/2459 FPE

338 RUM -9.80 @ 400 yards w/2270 FPE

Please check your math.

Also, if you really are able to get 3200+ FPS out of your 338 RUM, please tell us what kind of bbl you are using. The qualities of ballistic performance enhanced by your bbl would also be extended to the 300 RUM with the same bbl type ie legth twist ect...

If you are using a factory rifle, I think at 3200 FPS w/a 225 you might have a bomb on your hands.

Also remember that even though you have more area inside the bore to expand powder, you also have less case capacity in the 338 RUM vs the 300 RUM. The 338 is not a necked up 300 RUM. Typically, the 300 RUM and the 338 RUM will shoot bullets of the same weight about the same velocity. Barrel being equal and all.

Any way, I am not saying either is better than the other. Each has their own pros and cons. Each will do somthing great if used for the purpose intended.

I for one dont have the need or desire to shoot bullets over 190 grains. I would use the 300 RUM If I need bullets in the 250 grain range I would use the 338 RUM or better yet the 338 Lapua

[ 12-30-2003: Message edited by: meichele ]
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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