308 vs 6.5 creedmoor

on the other hand 308 you can get everywhere-most people go "huh?" when you mention 6.5 creedmoor
 
can't tell you on that one- I don't have any data on the 6.5 creed as I;m an old fart and have no interest in it- however-you can go right to 180-200 grains in the 308, but the 200 sits its azz in the powder so don't go any heavier than 180
 
Jrji said:
Which round is the most accurate when shoot long range? 500 - 1000m
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If you look at Berger's chart for Form Factor you will see that the 6.5mm bullets have a signficant advantage over the 30 cal bullets. They achieve better long distance performance in the wind with less recoil. It is also helpful to keep the bullets above the speed of sound ideally all the way to the target. The .308 is rather anemic in the powder capacity department, especially when the better heavy bullets in 30 cal. Consider that many long range competition rules force the use of military cartridges like the .223 and .308. That boosts their popularity for use, but does not mean they are more accurate...

For long distance in the 6.5mm caliber I would put the 6.5x284 ahead of the 6.5 Creedmoor though. 53 grains case capacity for the Creedmoor vs 66 for the 6.5x284.
 
If looking at 6.5 Cartridges, you could also have a look at the 260 Remington which is a necked down 308. as well as the 6.5x47 Lapua, which is very similar to the creedmoor ballistically but uses small rifle primers as opposed to the Large rifle primers in the Creedmoor.

Since this is in the reloading section, I will assume you are looking for better quality ammunition than the run of the mill off the shelf stuff. While there is always lots of 308 ammo on store shelves, not a lot of it is loaded to match grade tolerances. Whereas the 6.5 Creedmoor was initially developed for LR competition shooting, the ammo you will find on shelves for it will generally be of higher quality. In essence, if there are 20 different boxes of 308 in the store, only one or two may be match grade. If the store has Creedmoor, they may only have 2 types, but both of those will likely be higher grade ammunition.
 
Question is whether you reload or not. Since this is the reloading thread, I'm assuming you know how to reload. Apparently, Lupua will be selling brass for 6.5CM in 2017... I've shot 6.5x55 and 308 quite a bit. The sectional density is higher in 6.5 bullets over .308. If you can get the velocity up on the 6.5, before barrel burning territory, you have less drop (approx 25% less) and less wind deflection (same, about 25% less) out to 1000m over 308. Usually to get 140gr-like performance you need to go up to a 200gr bullet in 308.
 
My 6.5x47 does 2920fps with the 129gr lrab (.561 bc) and 2800fps with the 140 bergers (.6 bc). 308 isn't touching that. 6.5 cm/260 rem will do the same thing.
 
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