6UM vs 22CM

[mxgsfmdpx]

Gotcha. Yea that’s kind of crazy to think about. Hard for me to wrap my head around?

In my mind my 108 grain 6mm bullet going 3100 fps will kill further out than my 80 grain .224 bullet going 3300. But that is interesting to know I might have it backwards

If they are leaving the gun at the same velocity sure. But you’d need a long barrel and hot hand loads to achieve 3100 in a 6 Creedmoor. Here’s some info from another thread I posted with real world factory ammo velocities from 22CM and 6CM…

Let’s say both guns are setup identical with 18” barrels. Input 3100 for the .224 and 2850 for the .243 for the calcs. 10 MPH full value wind. 5,000 ft DA.

At 800 yards the 103 ELDX is 1,750ish FPS. 700ish ft lbs of energy. 5.6 MIL Up. 1.4 MIL Wind.

At 800 yards the 108 ELDM is 1,800ish FPS. 780ish fr lbs of energy. 5.4 MIL Up. 1.3 MIL Wind.

At 800 yards the 80 ELDX is 1,900ish FPS. 650ish ft lbs of energy. 4.6 MIL Up. 1.3 MIL Wind.

At 800 yards the 88 ELDM is 2,000ish FPS. 800ish ft lbs of energy. 4.4 MIL Up. 1.1 MIL Wind.

Free recoil energy in an 8 lb gun shooting 88 ELDM out of 22CM is around 9.5-10 ft lbs.

Free recoil energy in an 8 lb gun shooting 108 ELDM out of 6CM is around 11.5-12 ft lbs.

 

[hereinaz]

Gotcha. Yea that’s kind of crazy to think about. Hard for me to wrap my head around?

In my mind my 108 grain 6mm bullet going 3100 fps will kill further out than my 80 grain .224 bullet going 3300. But that is interesting to know I might have it backwards

Look at the effect of BC and velocity, it’s counterintuitive sometimes.

 

[justin davis]

If they are leaving the gun at the same velocity sure. But you’d need a long barrel and hot hand loads to achieve 3100 in a 6 Creedmoor. Here’s some info from another thread I posted with real world factory ammo velocities from 22CM and 6CM…

Let’s say both guns are setup identical with 18” barrels. Input 3100 for the .224 and 2850 for the .243 for the calcs. 10 MPH full value wind. 5,000 ft DA.

At 800 yards the 103 ELDX is 1,750ish FPS. 700ish ft lbs of energy. 5.6 MIL Up. 1.4 MIL Wind.

At 800 yards the 108 ELDM is 1,800ish FPS. 780ish fr lbs of energy. 5.4 MIL Up. 1.3 MIL Wind.

At 800 yards the 80 ELDX is 1,900ish FPS. 650ish ft lbs of energy. 4.6 MIL Up. 1.3 MIL Wind.

At 800 yards the 88 ELDM is 2,000ish FPS. 800ish ft lbs of energy. 4.4 MIL Up. 1.1 MIL Wind.

Free recoil energy in an 8 lb gun shooting 88 ELDM out of 22CM is around 9.5-10 ft lbs.

Free recoil energy in an 8 lb gun shooting 108 ELDM out of 6CM is around 11.5-12 ft lbs.

Ok gotcha. Yea I’m shooting a 24” barrel 6 creed and a 24” barrel 22 creed. The 6 creed is shooting 108 grain Berger’s. The 22 creed is shooting 80 grain Berger’s. My 6 creed currently is going 3030 but I’m shooting a lower change than I had it. They were going 3100 average. The 22 creed 80 grain is going 3350. In Colorado I can’t use 22 creed for big game so it’s a moot point for me I guess. I have to use bigger.

Here is my drop charts for both guns. They are about the same out to 800. After 850 yards the 6 creed takes over

 

[nm.otter]

For that application, 6.5s sort of hit a sweet spot on recoil management combined with reliable high BC bullets around 150ish grains that generally have enough “splash” on targets and the ground to give you decent feedback for learning.

Downsizing from 6.5mm CM has a certain appeal, but the more I look into it, the more I come to appreciate the CM. At 6,000 feet, 143 ELD-X factory loads hold 1,800 FPS out to 740 yards on a 20" barrel.

The case capacity to bore area ratio on 6mm GT is just 1% higher than that of 6.5mm CM. Eyes peeled for some longer 6mm projectiles that could shift this quickly.

 

[mxgsfmdpx]

Downsizing from 6.5mm CM has a certain appeal, but the more I look into it, the more I come to appreciate the CM. At 6,000 feet, 143 ELD-X factory loads hold 1,800 FPS out to 740 yards on a 20" barrel.

The case capacity to bore area ratio on 6mm GT is just 1% higher than that of 6.5mm CM. Eyes peeled for some longer 6mm projectiles that could shift this quickly.

There’s a lot to like about the 143 ELDX. Great killing bullet.

 

[Braaap]

correct me if am wrong here, but isnt colorado the only western state that won't allow for a .22 caliber?

WY doesn’t allow .22 for elk. Maybe moose and bison too, but I haven’t checked.

 

[bcmntgoathunter.]

I went 22 creedmore great round dose everything