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I'm thinking about developing a load using a 120 TTSX out of my T3 SL 7mm-08. I've heard the TTSX performs best when driven fast. What muzzle velocity should I try to get for best bullet performance?
P
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Anything around 2950 fps would be my goal and should be very easy to achieve. http://www.barnesbullets.com/files/2014/11/7mm-08RemingtonV6.pdfThis will get you to ~ 300 yards with an impact velocity of ~2300 fps, which I regard as ample. This is just my approach of moderate loading in regards to enough impact velocity at realistic ranges. Others may have more up to date ideas...
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Campfire Ranger
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Campfire Ranger
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Big game and you can likely get close to 3100. Run it as fast as accurate -
- Greg
Success is found at the intersection of planning, hard work, and stubbornness.
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Campfire 'Bwana
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Campfire 'Bwana
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For Barnes bullets, optimum velocity is as fast as you can drive it accurately and safely.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
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Run it as fast as accurate - Yep, I drive'em fast ,no matter the chambering.
TB, CWD and Covid-19 , free so far.....
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I've seen them impact moose at 3600+fps (obvious from more case capacity than a 7/08) and perform perfectly. You can't push them too fast IME, and I've tried... You should be able to make 3100+ out of a 7mm-08.
Suck bullets simply suck.
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In their #4 manual they list 3100+ with several as well.
Suck bullets simply suck.
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Barnes' loads are a little pessimistic. 44 gr. of RL 15, a F210 primer, in Remington brass averages in the high 3000's with good accuracy. That's out of a 22" barrel Montana. About the same out of a 22" Cooper. I'm still playing with Big Game and getting over 3100 fps with 50.0 gr. but I'm not finished working on this load (OAL trials) in my Montana. As always, I worked up to those loads in my rifles, others should do likewise.
If we live long enough, we all have regrets. But the ones that nag at us the most are the ones in which we know we had a choice.
Doug
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The 120 TTSX shot well from my 84 at 3000 fps via Big Game. At the time I was also shooting the 120 NBT at 3100 fps with nearly the same charge. At 100, the TTSX was an inch higher than the NBT, but had similar POI out to 500y while using a Leupo w/LRD. The NBT was used for practice, and TTSX for hunting.
Have since switched to 162 AMAX.
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Campfire Ranger
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I've run 120 cup core at 3050-3100 in two 21" guns, partial Sized RP 47/Varget - were safe in MY rifles - as always - Check manuals and work up.
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I am shooting them at 3175fps out of a 24" Remington with excellent accuracy. This is with big game at 1 grain under the max in the nobler book for the 120gr bt.
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I'm running 43 gr of RL15, haven't chrono, but they kill stuff dead. I'm guessing 3000 fps. 10 - 370yds with good results. Actually killed 2 does with one shot last yr at about 350 yds. Didn't mean to but it happens.
I'd run as hard as safely possible but for me 43 gr was more accurate than book max of 44.
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Campfire Outfitter
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43.5 grs of Varget pushes the 120 TTSX 3050 out of my 24" Hart!
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Campfire Ranger
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I'm running 43 gr of RL15, haven't chrono, but they kill stuff dead. I'm guessing 3000 fps. 10 - 370yds with good results. Actually killed 2 does with one shot last yr at about 350 yds. Didn't mean to but it happens.
I'd run as hard as safely possible but for me 43 gr was more accurate than book max of 44. Shot the same load in mine. 260 uses 40.5 gr of R-15 with a 120 TTSX at 2,900 but BC makes up for the velocity. Pretty much how the 7-08 got sold.
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CFE-223, 2000MR, Big Game, can all reach well over 3100 fps safely in a 22-24" barrel. My X-Bolt loves 50.5 gr BG and WLR primers for about 3120 fps. This will be the backup gun for Hope and I both this year elk hunting.
"Blessed is the man whose wife is his best friend - especially if she likes to HUNT!"
"Love the Lord your God with all your heart, soul, mind and strength, and love your neighbor as yourself. There is no commandment greater than these."
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It appears the important thing is impact velocity. From everything I've read at least 2000 fps at impact and a little faster doesn't hurt. The slower they are at the muzzle the sooner they drop below that 2000 fps threshold. So it depends on how far you want to shoot.
Most people don't really want the truth.
They just want constant reassurance that what they believe is the truth.
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I rolled up some loads and ran them over my chrony. All loads at 2.805", using WLRM primers. Here's what I found:
43.0 gr Varget: 2959 44.0 gr Varget: 2974 (over max, not recommended) 45 gr Varget: 3030 flat primer (over max, not recommended)
47.5 gr CFE223: 3046 (over max, not recommended)
49.5 Big Game: 3039
22 7/16" barrel, T3 SL
Big Game is Unobtainium at present, I'll see what CFE does in the accuracy department.
P
Obey lawful commands. Video interactions. Hold bad cops accountable. Problem solved.
~Molɔ̀ːn Labé Skýla~
Member #547 Join date 3/09/2001
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2950 is what im getting for average with RL15 44 grns. 120 TTSX & 120 NBT. Montana in 708 22 brl. good enough for me.
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Campfire Ranger
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Campfire Ranger
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What brass? WW holds about 1.5-2 gr more
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