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6.5CM for cow elk

mossback50cal said:
I think it is a velocity issue. The ones I have experience with were travelling a little over 3000 fps on impact. These 160s are doing a little under that at the muzzle, so hopefully it'll be a 150-300 yard shot and be traveling a little slower. I think the 3000+ fps is a little too fast for them.
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That's exactly what it is. The AB, as most bonded bullets, perform best at certain velocities. This is by design.
 
roadrunner said:
That's exactly what it is. The AB, as most bonded bullets, perform best at certain velocities. This is by design.
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True. But I like my bullets flying as fast as possible, as long as they are accurate. That's why I switched to solid copper. Dont have to worry about it. They hold up, as long as they are accurate. The Barnes TTSX have been great to me. Retain 99+% of weight and can absolutely scream out of the barrel.
 
I prefer performance over speed. Faster objects decelerate at a faster rate than slower objects.

A slower bullet with a higher BC retains more energy downrange than a faster bullet with a lower BC.

What gives the copper bullets an edge is the sectional density cause for higher BC's to maintain weight (longer bullets) compared to lead core.
 
There is a guy in Australia absolutely demolishing critters, including big feral cattle with a 124 grain Hammer Hunter moving over 4000 fps in a RUM. I have a box. mtmuley
 
roadrunner said:
I prefer performance over speed. Faster objects decelerate at a faster rate than slower objects.

A slower bullet with a higher BC retains more energy downrange than a faster bullet with a lower BC.

What gives the copper bullets an edge is the sectional density cause for higher BC's to maintain weight (longer bullets) compared to lead core.
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Yes sir. The TTSX has good Ballistic Coefficient. But they also withstand the torture of pushing the high speeds. The 145 GR LRX in 7mm has a BC of .486, which is just as good as the accubond, but I trust it more. It is also basically the same on knockdown power and speed retention if they leave the barrel at the same speed. However, I kick it up to about 3150 fps with the Barnes. That is where the accubond cannot handle it. What I am shooting carries more speed and knockdown power than the accubond downrange. And 4000 fps is absolutely absurd! What are you going to shoot with that cannon?

Also, the 6.5 CM has great BC, which is what makes it great. (just ribbing ya, but they do have great BC).
 
mossback50cal said:
Also, the 6.5 CM has great BC, which is what makes it great. (just ribbing ya, but they do have great BC).
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Things are getting sideways here.

6.5 CM doesn't have any ballistic coefficient whatsoever. Bullets have a measured BC based on their ability to overcome the resistance of the atmosphere during flight. Rifle cartridges have no BC, period. There are .264'' bullets available with an excellent BC and a terrible BC. The notion that just because its a CM makes it have a great BC is hilarious.
 
All these bulls fell to 6.5s last year. 2 of them with a 6.5x284 running 156 Berger EOL and the other two were with a 6.5x47 lapua running 144 Berger hybrids. Results were impressive. Every bull dropped in his tracks or went 10 yards and tipped over. Shots were 40 yards, 366 yards, 480 yards, and 670 yards.
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Weiserbucks said:
Things are getting sideways here.

6.5 CM doesn't have any ballistic coefficient whatsoever. Bullets have a measured BC based on their ability to overcome the resistance of the atmosphere during flight. Rifle cartridges have no BC, period. There are .264'' bullets available with an excellent BC and a terrible BC. The notion that just because its a CM makes it have a great BC is hilarious.
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Im talking about the bullets I use. Not the bullets in general. Sorry I didn't clarify that........ I have been reloading for almost 30 years, I know what BC is and that every single bullet has a different BC, even of the same caliber and grain. But that was just a joke to roadrunner, even though it went over some heads apparently.
 
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mtmuley said:
Knockdown power. Funny. mtmuley
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Yes, you know the ft-lbs of energy the bullet has on impact. Otherwise known as knockdown power.... If you do a simple search for bullet knockdown power, it will result in charts of energy measurements in a rating of ft-lbs on impact. Is that better for you?
 
The_Coloradoboy said:
308 will kill them just fine. Honestly the caliber debate is silly. Good bullets with good shot placement kill elk. Simple as that. Doesn’t matter whether it’s a 243 or a 338 lapua.
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This should be required reading for some of the Fudds in our world. Unfortunately they wouldn't comprehend it and would just start Fudding harder.
 
Im just asking that because the CM haters say the Creedmoor isn't enough gun, but actually has better energy at 300 yards from a 140 grain bullet than a 180 gr from a 308. Just to show them that it is their hate for the cartridge that blinds their judgement.
 
mossback50cal said:
Yes, you know the ft-lbs of energy the bullet has on impact. Otherwise known as knockdown power.... If you do a simple search for bullet knockdown power, it will result in charts of energy measurements in a rating of ft-lbs on impact. Is that better for you?
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No such thing as knock down power. I totally understand energy. A 124 grain bullet at 4000 fps has a $hitload of it. Monos driven at extreme speed work. mtmuley
 
mossback50cal said:
that was just a joke to roadrunner, even though it went over some heads apparently.
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I know what you meant. You also have to have a higher twist rate barrel. That's what makes it what it is. It would unadvised to shoot the bullet used in the 6.8 Western in a standard. 270 Win.
 
3TOE said:
He would need a 2” longer barrel just to keep the speed above 3000fps. ?
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My speed is 2875 with these I use Reloader 50. It’s a slow burn powder so I don’t get much pressure. I also use a drill bit and gave the throat more freebore.
 
Well its real to a lot of people I know, and to me. So I really don't care if it's "real" to you. We are talking about reloading, not a full on scientific experiment. Like I said, it's a term enough people use that if you search it, it goes to exactly what we are talking about. So that shows it's plenty "real".
 
"Knockdown power" is a slang term to describe the conservation of energy. If the energy of the bullet is more than the target can withstand on impact, and the bullet does not punch through, the target will get "knocked down" much like getting hit in the chest with a bowling ball traveling at 5 mph.

A .22 LR doesn't have much "knockdown power", but a 300 RUM does...
 
mtmuley said:
Been killing with a RUM for over 20 years. I've never knocked a critter down with it. mtmuley
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Knocked down, yes. Knocked over, no...

Actually, "knock down" power probably refers more to shooting something with a bow out of treestand.
 
Like I said, we have always used the term referring to energy. It may be slang, but it's what we use. And no smart ass, sour old man is going to make me stop using it.... But, those smart ass, sour old, argumentative men are why this website is why it isn't what it once was. Why there are very few stories of actual hunting, and pictures of animals killed. This website used to be fun, and a whole lot less criticism. Not so much talking down, like everyone was doing to this OP for asking a legitimate question. I gave a legitimate answer, and someone was obviously hurt that everyone didn't agree with him. This is my last post on this topic. It's obvious you just want to argue, and I am not on here to argue. I am here for the stories, to answer questions if I know the answer, to help other hunters. So, you can reply is you want, but I won't even bother reading it.
 
Jeez. Sorry guys. No offense intended. Well, except toward Miiligun after his uplifting pm. The knockdown power thing is just a pet peeve, not a big deal. mtmuley
 
A bazooka magnum isnt going to cure buck/bull fever or flinching during the squeeze of the trigger....
Just as a smaller caliber target rifle practiced from only a bench wont cure buck/bull fever or reproduce hunting shooting positions.

It's simple really. Put it in the right spot with anything legal be it a .243 or 20mm with a decent bullet and it will die.
Calibers and rifles vary as well as the ability of those using them in hunting conditions.
 
i retract my statement from earlier , i shot a 3 year old spike this year with a 6.5 creed at 560 yards and i was shocked at the results , 143 eldx out of my sig cross , topped with a huskemaw blue diamond scope , the only reason i attempted this was my kids gave me the rifle for fathers day , and i have been shooting long range my entire life , 3 slugs were just shy from making it into the body cavity , the bull was quartering away slightly , i finally put one behind the last rib quartering hard and he layed down broadside 10 yards from the prior 3 shots , i took one final shot and finally entered the chest cavity and hit the heart , but no exit , and almost no mushroom on all 4 slugs , and almost the same situation on my daughter in laws cow at 40 yards shorter distance , i will stick to the .338 rum from now on
 
The_Coloradoboy said:
All these bulls fell to 6.5s last year. 2 of them with a 6.5x284 running 156 Berger EOL and the other two were with a 6.5x47 lapua running 144 Berger hybrids. Results were impressive. Every bull dropped in his tracks or went 10 yards and tipped over. Shots were 40 yards, 366 yards, 480 yards, and 670 yards.
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But will those work on a COW!
 
mossback50cal said:
Im just asking that because the CM haters say the Creedmoor isn't enough gun, but actually has better energy at 300 yards from a 140 grain bullet than a 180 gr from a 308. Just to show them that it is their hate for the cartridge that blinds their judgement.
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A 6.5cm with 127gr barnes LRX at 300yds has 1400 foot pounds of energy. A 308 with 168 gr barnes LRX has 1800 foot pounds of energy. There are many that believe 1800ft-lbs of energy is the minimum amount needed to cleanly kill a elk. The 6.5 creedmoor loses that at 150 yards. With a 140 barnes x-bullet it drops below
1800ft-lbs after 200yds while the 308 with 180 gr x-bullet doesn't drop below 1800ft-lbs until 325yds. I'll stick with my 300wsm with 200gr barnes LRX bullets that have 1800ft-lbs of energy at 600yds. This is all based off nikon's ballistic calculator
 
I love it when all the 6.5 guys come to the rescue of all the 6.5's there is a f$#@^( place for everything , and imo the 143 eldx i think was the problem , but if we want to measure dicks a 7mm-08 beats the creed out to 500 all day ,308 isnt even close , and the fact that i got almost zero penetration , is all i need to know about small powder burners and big thick hide animals
 
critterstalker said:
A 6.5cm with 127gr barnes LRX at 300yds has 1400 foot pounds of energy. A 308 with 168 gr barnes LRX has 1800 foot pounds of energy. There are many that believe 1800ft-lbs of energy is the minimum amount needed to cleanly kill a elk. The 6.5 creedmoor loses that at 150 yards. With a 140 barnes x-bullet it drops below
1800ft-lbs after 200yds while the 308 with 180 gr x-bullet doesn't drop below 1800ft-lbs until 325yds. I'll stick with my 300wsm with 200gr barnes LRX bullets that have 1800ft-lbs of energy at 600yds. This is all based off nikon's ballistic calculator
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The cow elk above was at 347 yards. The 6.5 Creedmore dropped her within 10 seconds with one shot.
 
My son has had good luck with the 6.5cr with the hornady 143 eldx. He has killed 2 elk and a muley. One elk and a mule deer dropped in their tracks, one elk too 2-3 steps and dropped. Both elk were cows , under 100 yards.
 

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