140 gr. or 150 gr. Barnes TTSX for an elk round?

[banebc]

As you replied I noticed that was a typo. Muzzle velocity is 3080 with 65 gn of 7828ssc Using Barnes brass and Win. mag primers


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[Yoteassasin]

As you replied I noticed that was a typo. Muzzle velocity is 3080 with 65 gn of 7828ssc Using Barnes brass and Win. mag primers


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Right on thanks

 

[A382DWDZQ]

Just going to resurrect this thread since I was just running the numbers on it. Key takeaway for me is the the 120 TTSX is the worst choice, energy wise, and velocity is negligible, and the LRXs are best, starting with the heavier 145 LRX as the best. Then the TTSXs are going to be better in order of heaviest to lightest. The only advantage of the 120 TTSX is a max PBR or 325 vs. 300 for everything else...

The LRX will expand at lower velocities. I don't have numbers for 7mm, but velocity required for reliable and consistent expansion...

For .277 it is:

• 95gr TTSX- 1600 fps
• 129gr LRX- 1400 fps
• 130gr TSX- 1800 fps

For .308 it is:

• 130gr TTSX- 1800 fps
• 165gr TTSX- 1800 fps
• 168gr TTSX- 1500 fps
• 180gr TTSX- 1500 fps
• 180gr TSX- 1500 fps

So, I'm guessing that the LRX velocities below are probably ok, with the exception of the 150 TTSX at 600, that would need to be confirmed with Barnes to see if it is a 1800 or 1500 minimum.

Energy at 300 yards:

• 145 LRX = 1740
• 139 LRX = 1730
• 150 TTSX = 1695
• 140 TTSX = 1634
• 120 TTSX = 1596

Max Range > 1000 ft-lbs.

• 145 LRX = 650 / 1770 fps
• 139 LRX = 625 / 1826 fps
• 150 TTSX = 600 / 1749 fps
• 140 TTSX = 550 / 1823 fps
• 120 TTSX = 525 / 1961 fps

The reason I put these stats together in the first place was to compare the 7mm-08 to the 270 Winchester. 270 Winchester with 129 LRX has the best energy at Max PBR, ties for max PBR range, and has the longest range holding > 1000ft-lbs of energy at 700yds. That said, my perception of the 7mm-08 at conventional distances really changed for the better.

 

[A382DWDZQ]

Here is the data...

 

[rootacres]

Monos need speed and with you rocking a 7mm-08 I would go with something like the 139 LRX or 143 Hammers. Slightly more speed will be better than slightly more weight for your bullet selection. If you were going with a bonded or lead core bullet Id probably tell you to go with the slightly heavier option.

I shot 168 bergers for elk out of my 7 SAUM and then 143gr hammers for coues.

 

[Newtosavage]

I'm going with the 139 LRX's for my elk bullet out of my 7mm-08. At 0.47 BC, and a lower expansion velocity, the numbers are just too good to ignore. CFE 223 is giving me an honest 2900 fps. out of my 20" barrel. At the elevations I usually hunt, that is good for much farther than I'm willing to shoot.

The 120's over CFE 223 are intriguing. 3200 fps is pretty easy from my tube but I haven't quite gotten the accuracy from them (1" vs. 3/4" with the 139 LRX's) that I was hoping for. They are still consistently sub-MOA at 300 yards, but I'm really wondering who is shooting elk with 120 TTSX's, at what velocities and with what results? The Max PBR for those at 3200 is a bit staggering, so it's tempting for sure. I guess it's hard to overlook those 139 LRX numbers - at least to me anyway.

 

[35WhelenAI]

139 LRX is gonna serve you well.

 

[Doc Holliday]

As you replied I noticed that was a typo. Muzzle velocity is 3080 with 65 gn of 7828ssc Using Barnes brass and Win. mag primers


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What is your length to ogive, or your COAL?

I just measured and can do 2.738 to ogive, and 3.323 COAL, so hoping to go above the manual before pressure signs

 

[Forestryman2010]

139 or 145 LRX. 145 LRX hammered my last bull out of my 280AI

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I know this was a while ago but how far was the elk?

 

[Pharmseller]

Is it odd that the OP never responded?




P

 

[sneaky]

I know this was a while ago but how far was the elk?

That one was about 150yds. 155 Terminal Ascent stoned one this year at 155yds. Guess that's about the distance I normally run into them lol

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[Forestryman2010]

That one was about 150yds. 155 Terminal Ascent stoned one this year at 155yds. Guess that's about the distance I normally run into them lol

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That terminal ascent is a great bullet. Thank you for the reply

 

[Pharmseller]

Still nothing from the OP?




P