6.5cm or .308

[BW64]

Wind is 12-16 mph mostly 90 degrees. Which is better 6.5cm with 140eldm @ 2755 or .308 with 195SMKT @ 2580. Shooting 1 MOA steel target from 500 to 1100 yards. Which would buck the wind better.

BW

 

[STOMP442]

Well with a quick look, the 6.5 140 ELD has an average G7 bc value of .319 vs .298 (Litz G7) for the .30 cal and a starting velocity 175 fps faster than the .30 cal. So my money would be on the 6.5CM. Running a quick calc using the old Berger calculator using standard conditions and default sight heights here are the results with a 15mph wind.

6.5CM @ 2755
500 drift = 4.02 moa
1100 drift = 11.23 moa

.308 @ 2580
500 drift = 5.02 moa
1100 drift = 13.84 moa

 

[BW64]

Thank you. That's a little closer than I figured. Guess I'll go with the 6.5.

BW

 

[rsmithsr50]

lol that is assuming you can get the 65 to shoot as well as the 308. 308 all day.

 

[dolek]

lol that is assuming you can get the 65 to shoot as well as the 308. 308 all day.

Why would you doubt the 6.5...ever shoot one ?

 

[Evan]

The 6.5 will shoot inside of the 308 under all conditions when fired from equivalent rifles when it comes to any non-benchrest use. The BC and speed advantages are too great. Also, I can't enter a gun store without tripping over piles of creedmoor ammo and rifles for sale, so availability is excellent. It'll be here for a long time.

 

[rammac]

On the other hand you can use a heavier bullet (if your twist rate will handle it) and using a 215gr Berger Hybrid with a muzzle velocity of about 2430 fps in the .308 you would end up with more than 3 inches less wind adjustment at 15 mph;

.308 @ 2430
500 drift = 4.05 moa
1100 drift = 10.60 moa

You'll have more elevation drop with the .308 but that's easy to handle with a ballistics calculator.

 

[STOMP442]

On the other hand you can use a heavier bullet (if your twist rate will handle it) and using a 215gr Berger Hybrid with a muzzle velocity of about 2430 fps in the .308 you would end up with more than 3 inches less wind adjustment at 15 mph;

.308 @ 2430
500 drift = 4.05 moa
1100 drift = 10.60 moa

You'll have more elevation drop with the .308 but that's easy to handle with a ballistics calculator.

You can step up bullet weights in the 6.5 too. The .308 has to be pushed to its absolute limit to out ballistic a 6.5 of similar size case. It can be done, but that's assuming it will shoot the big heavies to the desired accuracy at the velocity needed to do so. Every 6.5 there is will shoot a 140 extremely well in a pretty large velocity window.

 

[gman47564]

I've had a few of both and that's a easy choice for me... the 6.5 creedmoor all day everyday...

 

[D-4297]

Guess I'm just old fashioned , and stuck in the past , but the "calculator" doesn't pull the trigger . A 140gr bullet at 1100 yrds as compared to a 200.20x , 200 Hybrid , or the new 208 out of a properly set-up F-class .308 ? I shoot those so-called "Heavies" and they're still supersonic at 1100 . MV from a Lab is 2650 - 2660 . A little faster than the OP specified . Numbers and BC tables don't hit targets . Shooters do . Nothing wrong with a CM , just not my choice .

 

[Bc'z]

Y'all forget 1 very important element....
R E C O I L !!!
I can shoot my 6.5 all day, every day, with minimal contact to the rifle.
Now a 308 pushing heavy bullets may cause you to develop a bit of a flinch. Not saying you would develop a flinch, but chances are more likely.

 

[Downhill]

The 308 is not as sexy as the 6.5. But the 308 will make learn how to be a skilled rifleman. If you are a new shooter I would recommend the 308. Just learn how to drive it. Later on move to 6.5 and you'll probably shine at the matches.

 

[rsmithsr50]

excuse me ???
or I may just shot it all day with no issues other than great hits ?
" may cause" as in your dream no data.

Y'all forget 1 very important element....
R E C O I L !!!
I can shoot my 6.5 all day, every day, with minimal contact to the rifle.
Now a 308 pushing heavy bullets may cause you to develop a bit of a flinch. Not saying you would develop a flinch, but chances are more likely.

 

[Dub]

I will take the 308 every day over the CM

 

[mike a]

Y'all forget 1 very important element....
R E C O I L !!!
I can shoot my 6.5 all day, every day, with minimal contact to the rifle.
Now a 308 pushing heavy bullets may cause you to develop a bit of a flinch. Not saying you would develop a flinch, but chances are more likely.

Bc'z is right about recoil. I was shooting a 600 match with my little 6BR. The guy next to me let me shoot his 18# ftr rig with the 200-20s. Great balls of wrecking balls. I cant imagine shooting 60+ rounds of that. Damn near knocked my dentures out. Mike

 

[Medic505]

Like I said somewhere else, a .308 is a Man's rifle.....

 

[wkdickinson]

Starting in my mid-30's I shot a 308 Win M70 match rifle across the course and long range for 20 or so years, using 200 SMK at 600 yds and beyond, with good result, given my ability/commitment. That was back in the day when "serious" long-range competitors were using 300 Win Mags and 30-338's.

I will tell you that even a "hot" 308/200 gr. load takes it's toll, over the course of a 45 or 60 shot match, recoil-wise, even for a young man. Now being in my mid-60's, I had that same rifle re-barreled to a 6.5 CM, and it is a delight to shoot. I understand sticking with what works for you, but times change and technology moves on.

 

[MikeMcCasland]

In the OPs scenario 6.5.

Setup correctly though, there's very very little difference. I've shot 30" 6.5CMs with 140 Hybrids next to 30" 308s shooting the 200.20X. Imagine my surprise when the 200.20X passed through the shotmarker at 1k showing a higher velocity. I do agree on recoil though, 308s with the 200s aren't big kickers, but they're more to manage for sure; lets just there's a reason you don't see more folks shooting the 210s-215s-230s in TR.

I actually improved my rating switching from a 6.5CM to a .308, go figure.

Prior to shooting both in competition, I'd of echoed what a lot of keyboard warriors on other forums say, but the .308 ain't no joke. Hell look at what PJ just did at BSWN recently; he'd of placed 6th in Open against a bunch 7RSAUMs, 284s, 300 WSMs etc at 1,000 yards.

 

[Bc'z]

excuse me ???
or I may just shot it all day with no issues other than great hits ?
" may cause" as in your dream no data.

I'm not saying a 308 can't be, and hasn't been shot all day.
My data is laws of physics....
FOR EVERY ACTION THERE IS A EQUAL AND OPPOSITE REACTION.
So take your argument up with Newton, or go to the nearest mirror and argue with yourself!
So instead of comparing pineapples to peaches,
Given a equal base line, a 140 class bullet, will out shoot a .30 call of comparable weight. All the external ballistics says so, @STOMP442 layed it out in plain English.
I didn't write the book but I read it!!
Oh yeah, I shoot a .30 call with heavies pushing 200gr bullets in the mid 2800's.

Have a nice day
Brett

 

[mike a]

Like I said somewhere else, a .308 is a Man's rifle.....

Maybe when I finish this book.