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Discussion Starter #1
I have mentioned frequently how I like Triple Shock X bullets for rifles. So, while looking around, I found something interesting.

Barnes has a new 130 grain TSX Boat Tail .308 bullet. In the .308 Winchester it can be driven to 3200 fps according to Barnes. There could be some great utility with that load.

On the other end of the spectrum, if you're looking for high SD and BC Barnes has for some time offered a .308 200 grain TSX Flat Base bullet. Just guestimation here, but you might be able to drive this to 2450 or maybe 2500 fps (again in the .308 Winchester).

I haven't run the numbers in a ballistics program, but I think these loads might do fairly well. In any case, if you want something different in your .308, maybe one of these is for you.

If you want more technical info, check out the TSX bullets here: http://www.barnesbullets.com/prodtsx.php
 

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I would love to see either of those loaded in 300 Win Mag
 

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Discussion Starter #5
Thanks for the link to the Ballistics program Mel!

Just for grins I'll run my proposed loads through it:

.308 130 grain TSXBT @ 3200 fps
Muzzle Energy: 2956 ft/lbs (Sea Level)

At 1000 yards it's still supersonic at 1237 fps, packs 442 ft/lbs, drops about 344 inches, has 105.5 inches of drift in a 10mph wind, and takes 1.537 seconds to get there.

.308 200 grain TSXFB @ 2500 fps
Muzzle Energy: 2775 ft/lbs (Sea Level)

At 1000 yards it's still supersonic at 1273 fps, packs 720 ft/lbs, drops about 454 inches, has 88.5 inches of drift in a 10mph wind, and takes 1.703 seconds to get there.

Ok, I hope I did everything right in the program...I admit to taking a guess at the muzzle velocity for the 200, based on figures for more standard contruction bullets of that weight in the .308. In any case, they both look like they have some promise. Thoughts?
 

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Rate of twist will be a concern with the 200gr in a 308. I'd say 1:10" may not be fast enough.... anyone want to run this through the greenhill formula?

MEL
 

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Discussion Starter #7
I'm pretty sure Lilja says 1:10 is acceptable, although X bullets are longer than normal. I read somewhere else that 1:9.7 would be the minimum according to a calculator program, again, X bullets probably need a slightly faster twist due to their length.

My pet 180 grain .308 idea at 2700 fps outperforms the 200 grain load in all aspects I think; I came across the 200 grainer while searching for TSX bullets 30 caliber or smaller with a SD greater than .3.

I'm just trying to think up interesting cartridge ideas involving Barnes bullets :wink:
 

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For big things that go bump in the night, that 200 grain TSX would be potent! 2500 FPS is plenty of scoot for a round that is made to penetrate.
 

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Discussion Starter #9
Muzzleblast, thats what I was thinking :wink:

Ok, I almost forgot: Lilja says 1:10 is enough for a 220 grain bullet, so a 200 grain TSX should be ok from a 1:10.
 

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I'd like it because it wouldn't shoot a fireball down range and pound the shoulder enough to make a second shot too slow :D

1:10 rocks lol
 
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