6.5 Creedmoor 24" barrel

trpr154

trpr154

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Mar 17, 2009
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#1
I want to know if anyone has chrono data on the 6.5 creedmoor factory ammo with a 24"-27" barrel. I'm planning on a 24" barrel to make it practical with a suppressor, but didn't know how much velocity I'd loose compared to the 28" Hornady #'s.

Have decided on the Creedmoor. Don't want to know about any other 6.5 caliber options.

Plan on shooting factory ammo in it for a while. Don't have a lot of time for reloading at the moment.

I searched a lot of threads with and without the Snipers Hide Google search engine, but didn't see these #'s.

Also if anyone has knows of the cheapest place to buy Creedmoor ammo, feel free to send that info my way.

Thanks
 
#2
Re: 6.5 Creedmoor 24" barrel

Have a couple buddies with 24-26" CM's and seem to recall them getting around mid 2700's for MV with the 140 Amax factory stuff.

But, I could be mistaken.
 
#3
Re: 6.5 Creedmoor 24" barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Swan</div><div class="ubbcode-body">Have a couple buddies with 24-26" CM's and seem to recall them getting around mid 2700's for MV with the 140 Amax factory stuff.

But, I could be mistaken. </div></div>

If it's not too much trouble, would you be able to check with them and get back to me with specifics. Appreciate the help.

Thanks
 
#6
Re: 6.5 Creedmoor 24" barrel

I'm having a 6.5 CM built as well. I found another member on the hide that was selling their 6.5 CM with a 1:8 24" Shilen barrel. I PM'd and asked for numbers he provided:

140 AMAX 2,730fps with an ES of 7 to 9.

I'm kinda in the same boat. I want to go with a 26" but I'll be loading my own. I was planning on safely uping the powder charges over the printed loads on the back of the box to squeeze a bit more performance. If I ran the #'s correctly, slinging the 140 AMAX @ 2700 ft/s doesn't provide much improvement over the 175 SMK in .308 @ 2650 ft/s. This comparison made me rethink the 22 or 24" and decide to go at least 26" for this cartridge.

Definitely would like to hear from others.
 
#7
Re: 6.5 Creedmoor 24" barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dvdt</div><div class="ubbcode-body">I'm having a 6.5 CM built as well. I found another member on the hide that was selling their 6.5 CM with a 1:8 24" Shilen barrel. I PM'd and asked for numbers he provided:

140 AMAX 2,730fps with an ES of 7 to 9.

I'm kinda in the same boat. I want to go with a 26" but I'll be loading my own. I was planning on safely uping the powder charges over the printed loads on the back of the box to squeeze a bit more performance. If I ran the #'s correctly, slinging the 140 AMAX @ 2700 ft/s doesn't provide much improvement over the 175 SMK in .308 @ 2650 ft/s. This comparison made me rethink the 22 or 24" and decide to go at least 26" for this cartridge.

Definitely would like to hear from others.

</div></div>

That's some good info, and exactly what I'd like to see.
 
#8
Re: 6.5 Creedmoor 24" barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dvdt</div><div class="ubbcode-body">I'm having a 6.5 CM built as well. I found another member on the hide that was selling their 6.5 CM with a 1:8 24" Shilen barrel. I PM'd and asked for numbers he provided:

140 AMAX 2,730fps with an ES of 7 to 9.

I'm kinda in the same boat. I want to go with a 26" but I'll be loading my own. I was planning on safely uping the powder charges over the printed loads on the back of the box to squeeze a bit more performance. If I ran the #'s correctly, slinging the 140 AMAX @ 2700 ft/s doesn't provide much improvement over the 175 SMK in .308 @ 2650 ft/s. This comparison made me rethink the 22 or 24" and decide to go at least 26" for this cartridge.

Definitely would like to hear from others.

</div></div>
Thinking you didn't run the numbers right. All things being equal at sea level:
Drop of .308 (175smk @ 2650)
inches moa 10mph wind
500yds -61.3 -11.7 17.7 3.4
1000yds -411.5 -39.3 101.6 9.7

Drop of CM (140Amax @ 2700)
500yds -54.8 -10.5 13.4 2.6
1000yds -338.3 -32.3 72.1 6.9

that 2700 MV for that factory load is low as well, so your actual drop/wind drift will be waaay better than the .308 load.
 
#9
Re: 6.5 Creedmoor 24" barrel

I ran the numbers, as well. I wanted to compare factory ammo to factory ammo. With the new Hornady 178gr bthp Match Superperformance Ammo, the 308 is very close to the 140gr 6.5 Creedmoor both in the 24" barrels. The 178gr BTHP has a MV of 2775 and a BC of .530. The Creedmoor would be MV 2750 and a BC of .585.

With these two factory rounds the Creedmoor would still win out, but they would be very close. Although most 308 factory match ammo isn't loaded as hot as the Superperformance 308.
 
#10
Re: 6.5 Creedmoor 24" barrel

I put together a 6.5CM a few moths ago, went back and forth over barrel length, 24 or 26. Went with a 26" 1-8 Kreiger. At 1st the 26" seemed huge, my only other bolt rifle was a SPS Tactical 308. Glad I went with the 26".

Was disappointed with the factory 140 Amax ammo, 2610fps. 31 moa to 1000yds shooting @ 8000' elevation. Dumped a handful of cases and weighed the powder, 40.6. I was relieved when I saw the 40.6 on the scale, that explains things.

Loaded 139 scenars over 43gr of 4350, have not chrono'd it, took 25 moa to 1000yds. Guessing 2800+ fps or so.

Bought the loaded ammo from Powder Valley.
 
#11
Re: 6.5 Creedmoor 24" barrel

The 178 superformance is not doing so well right now. They are having big issues with pressure signs. Until they get the issues sorted out it really isn't a reliable option.

Josh
 
#12
Re: 6.5 Creedmoor 24" barrel

I've never bought a box of Hornady Creedmoor ammo, don't have a 6.5 yet, but I just found this pic on another board. It actually shows the data for a 24" barrel with the 140gr AMAX.

81494.jpg


Shows more powder than you saw in your cases Kevin U, and about the same MV as DVDT showed "140 AMAX 2,730fps with an ES of 7 to 9"
 
#13
Re: 6.5 Creedmoor 24" barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dvdt</div><div class="ubbcode-body">I'm having a 6.5 CM built as well. I found another member on the hide that was selling their 6.5 CM with a 1:8 24" Shilen barrel. I PM'd and asked for numbers he provided:

140 AMAX 2,730fps with an ES of 7 to 9.

I'm kinda in the same boat. I want to go with a 26" but I'll be loading my own. I was planning on safely uping the powder charges over the printed loads on the back of the box to squeeze a bit more performance. If I ran the #'s correctly, slinging the 140 AMAX @ 2700 ft/s doesn't provide much improvement over the 175 SMK in .308 @ 2650 ft/s. This comparison made me rethink the 22 or 24" and decide to go at least 26" for this cartridge.

Definitely would like to hear from others.

</div></div>

IIRC, Hornady loads their factory 6.5 CM at 57K and max is 62K, so their is some "safe" room for improvement. Pressure reference
 
#14
Re: 6.5 Creedmoor 24" barrel

Yes there is. I have loaded to 43grns of H4350 with the 140 AMAX in my 28" barrel and got about 2870fps and very good accuracy and ES/SD numbers.
 
#15
Re: 6.5 Creedmoor 24" barrel

The factory 140's shoot great out of my 24" barrel, but only yield about 2650fps. Too slow for me, at that speed my .308 is more efficient.

I've used H350, H4831sc, and RL17. Out of the 3, RL17 gave me the best speeds at a tick over 2900, but it was a ver inconsistent powder and fluctuated a lot. The H4350 has been good, and the 4831sc is the powder I'm using now. It has been very consistent across vast temp ranges, and the ES/SD numbers were single digit. I'm thinking I'll stay with it. I'm getting 2790fps with the 4831 with a pretty mild load. I can get it faster, but my rifle seems to have an accuracy node around 2800, and again at around 2900. I'm happy where I'm at with the performance at 2800....
 
#16
Re: 6.5 Creedmoor 24" barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JRose</div><div class="ubbcode-body">The factory 140's shoot great out of my 24" barrel, but only yield about 2650fps. Too slow for me, at that speed my .308 is more efficient.

I've used H350, H4831sc, and RL17. Out of the 3, RL17 gave me the best speeds at a tick over 2900, but it was a ver inconsistent powder and fluctuated a lot. The H4350 has been good, and the 4831sc is the powder I'm using now. It has been very consistent across vast temp ranges, and the ES/SD numbers were single digit. I'm thinking I'll stay with it. I'm getting 2790fps with the 4831 with a pretty mild load. I can get it faster, but my rifle seems to have an accuracy node around 2800, and again at around 2900. I'm happy where I'm at with the performance at 2800....
</div></div>

If you don't mind, could you give your load data with the H4831SC. I might be interested in trying it.
 
#17
Re: 6.5 Creedmoor 24" barrel

46.5 gr 4831sc
brass trimmed to 1.910
139 Scenar
Fed210M
base to OGIVE 2.235" (I think this is right, I'm about .015" off the lands.)
velocity: 2790 (avg)

47 gr yielded around 2820fps I believe.
 
#18
Re: 6.5 Creedmoor 24" barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JRose</div><div class="ubbcode-body">46.5 gr 4831sc
brass trimmed to 1.910
139 Scenar
Fed210M
base to OGIVE 1.235" (I think this is right, I'm about .015" off the lands.)
velocity: 2790 (avg)

47 gr yielded around 2820fps I believe. </div></div>

Thanks
 
#20
Re: 6.5 Creedmoor 24" barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: trpr154</div><div class="ubbcode-body">I've never bought a box of Hornady Creedmoor ammo, don't have a 6.5 yet, but I just found this pic on another board. It actually shows the data for a 24" barrel with the 140gr AMAX.

81494.jpg


Shows more powder than you saw in your cases Kevin U, and about the same MV as DVDT showed "140 AMAX 2,730fps with an ES of 7 to 9"

</div></div>

You have to like the way they play the game.
 
#21
Re: 6.5 Creedmoor 24" barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MinorDamage</div><div class="ubbcode-body">JRose,

Base to ogive must be 2.235 as your brass length is longer than your reported base to ogive length.

Josh </div></div>

Typo, thx...
 
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