22 Creedmoor and 85.5 Berger

[akmtnhnt]

My experience (and many others with a 22 CM or 22-250 AI) has been different using a 1:8 twist. I can push them comfortably to 3200+ and they've shot very well out to distance. I've shot a coyote at 600 yards, doe antelope at 420 yards, and mule deer buck at 320 yards with the 88 ELDM.

Plugging numbers into berger's stability calculator shows "marginal stability" with 6% BC compromise at 5000' elevation - on target performance has shown it hasn't been anything to worry about at this point.

Berger's stability calculator does not factor in plastic tips. It's not useful for stability of anything with a tip.

 

[stazmania]

Berger's stability calculator does not factor in plastic tips. It's not useful for stability of anything with a tip.

How do you calculate stability when a bullet has a plastic tip?

 

[akmtnhnt]

How do you calculate stability when a bullet has a plastic tip?

With one that accounts for it.

JBM - Calculations - Stability

jbmballistics.com

 

[Varmint Hunter]

My experience (and many others with a 22 CM or 22-250 AI) has been different using a 1:8 twist. I can push them comfortably to 3200+ and they've shot very well out to distance. I've shot a coyote at 600 yards, doe antelope at 420 yards, and mule deer buck at 320 yards with the 88 ELDM.

Plugging numbers into berger's stability calculator shows "marginal stability" with 6% BC compromise at 5000' elevation - on target performance has shown it hasn't been anything to worry about at this point.

I'm running a Bartlein 7.5" twist. I assumed that the 88ELD bullets would be too long/heavy for my rifle. Maybe I'll give them a try. The 85.5 Bergers shoot very well.

 

[stazmania]

With one that accounts for it.

JBM - Calculations - Stability

jbmballistics.com

I have seen the bullet length chart before and it shows the length of the bullet with out the tip and the tip length separately. If it is included in the stability calculation why do they show it separately?

 

[waspocrew]

I'm running a Bartlein 7.5" twist. I assumed that the 88ELD bullets would be too long/heavy for my rifle. Maybe I'll give them a try. The 85.5 Bergers shoot very well.

I have a 1:7.5 twist 22 CM - it likes the 88 ELDM as well.

 

[akmtnhnt]

I have seen the bullet length chart before and it shows the length of the bullet with out the tip and the tip length separately. If it is included in the stability calculation why do they show it separately?

If you have the length without the tip you could discount it in the stability calc. The tip is included because a plastic tip does not weigh what lead(or other metal) does. The plastic tip assumptions don't work as well if you have an aluminum tip. Weight matters.

 

[stazmania]

If you have the length without the tip you could discount it in the stability calc. The tip is included because a plastic tip does not weigh what lead(or other metal) does. The plastic tip assumptions don't work as well if you have an aluminum tip. Weight matters.

The bullet length chart separates Aluminum tip measurements the same as plastic. My question is do you add the two measurements together or just use the non tipped measurement when calculating stability?

 

[MagnumManiac]

I had zero problem running 88's in a 8" twist 22-284 a couple of years back running Nosler CC.
I have since moved to a 22-250AI 7" twist, running a few 88g pills, but not Hornady.
7.5" twist should handle all 88g pills.

Cheers.

 

[Marky_mark]

i have a load for both the 88 ang 85.5 with h4350
Very accurate and consistent

 

[Iron Worker]

My experience (and many others with a 22 CM or 22-250 AI) has been different using a 1:8 twist. I can push them comfortably to 3200+ and they've shot very well out to distance. I've shot a coyote at 600 yards, doe antelope at 420 yards, and mule deer buck at 320 yards with the 88 ELDM.

Plugging numbers into berger's stability calculator shows "marginal stability" with 6% BC compromise at 5000' elevation - on target performance has shown it hasn't been anything to worry about at this point.

Very interesting

 

[akmtnhnt]

The bullet length chart separates Aluminum tip measurements the same as plastic. My question is do you add the two measurements together or just use the non tipped measurement when calculating stability?

Use the total length of the bullet with the tip, and then enter the tip length in that part of the calculator.

 

[Iron Worker]

There is a slight difference in the BC of Berger 85.5 gr bullets and the 88gr ELD. I'll stick with the Bergers.