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#7103979 - 03/07/18 11:59 AM 7mm-08 A.I. continues to impress.
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 24521
Loc: Wolfe City, TX
My little 17" walking around rifle has a good load with 162 gr. ELD-X, at a muzzle velocity of 2640 fps on formed brass. Just because I wanted to know, I decided to work up a load with 150 gr ELD-X. I wanted to know how fast they would go out of such a short barrel, and I wanted to see if the incredible (for weight and length) BC was legit. Sunday I ladder tested them, searching for pressure. Keep in mind, standard 7mm-08 data is at your fingertips, but Ackley Improved data is not necessarily. I had to keep stepping up until I saw pressure signs on the brass. Well, I saw a node beginning, but kept going, and finally got hard bolt lift, and a shiny ring around the primer pocket, it got out of the node, so no worries, but I did find pressure.

Tuesday was time to group shoot the three charges that were in the node, and right before pressure. There was one clear winner with a vertical dispersion of 13/16" at 300 yards. I reproduced that load, and headed to the 800 yard range. I guessed at an MV of 2700 fps, and plugged that into the ballistic calculator. It center punched every steel out to 800 yards. So the BC and the MV seem to be correct. I am normally the guy that runs heavy, high BC bullets, but this lighter one, the rifle seems to like better. I checked the energy delivery out to 500 yards, and the increase in velocity looks to be delivering the same energy as the big 162's going 60 fps slower, at the muzzle.

My rental rifle is a standard 7mm-08, and it too shoots 162 A-maxes at 2640 fps MV, but it has a 3" longer barrel. wink

I found a legitimate 120 fps gain in velocity, shooting 162's out of 24" barrels, on two rifles last summer. That gain was from unformed brass, to formed brass with more powder. In my opinion it is the highest performance cartridge that will fit that action. It cheats wind like a 6.5mm, but hits much harder. Recoil is negligible, the case is just flat out efficient!
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#7103996 - 03/07/18 12:16 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
garyrapp55 Online   content
Tracker

Registered: 12/26/11
Posts: 657
Loc: Ft. Worth
That's great news. As soon as my mags come in, all my parts go to Chad to be delivered to the guy you recommended. I'm having 7-08AI reamed at 24" in a Bartlein 8.7 twist. I hope the results are good.

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#7104008 - 03/07/18 12:29 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 24521
Loc: Wolfe City, TX
It will be hell on wheels!
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#7104045 - 03/07/18 12:58 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
Sneaky Offline
The "Grouch"

Registered: 10/22/12
Posts: 18780
Loc: Winters
Love it.
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#7104119 - 03/07/18 02:10 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
Buzzsaw Online   content
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Registered: 06/29/11
Posts: 12657
Loc: Frisco, Texas
sweeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeet woot
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#7104148 - 03/07/18 02:42 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
spg Offline
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Registered: 08/11/13
Posts: 1537
What kind of brass are you using?

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#7104163 - 03/07/18 03:06 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 24521
Loc: Wolfe City, TX
Lapua
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#7104174 - 03/07/18 03:21 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
jorge Offline
Extreme Tracker

Registered: 02/01/11
Posts: 4459
Loc: Lake Jackson, TX
It's a dandy of a round but something about 22 cal and 6mm just gets me going.
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#7104222 - 03/07/18 04:02 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
patriot07 Online   content
Veteran Tracker

Registered: 11/06/11
Posts: 2370
Loc: Royse City, TX
About how many grains of powder does 7-08 AI use with a 150?

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#7104233 - 03/07/18 04:14 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
spg Offline
Pro Tracker

Registered: 08/11/13
Posts: 1537
Originally Posted By: FiremanJG
Lapua


The best.

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#7104245 - 03/07/18 04:32 PM Re: 7mm-08 A.I. continues to impress. [Re: patriot07]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 24521
Loc: Wolfe City, TX
Originally Posted By: patriot07
About how many grains of powder does 7-08 AI use with a 150?


Depends on what powder.

Up to 47.0 gr. nuts
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#7104278 - 03/07/18 04:59 PM Re: 7mm-08 A.I. continues to impress. [Re: garyrapp55]
Lazyman Online   content
Extreme Tracker

Registered: 01/13/11
Posts: 4236
Loc: Hamilton
Originally Posted By: garyrapp55
That's great news. As soon as my mags come in, all my parts go to Chad to be delivered to the guy you recommended. I'm having 7-08AI reamed at 24" in a Bartlein 8.7 twist. I hope the results are good.


Mine are probably going to same said guy lol...
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#7104287 - 03/07/18 05:05 PM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
Lazyman Online   content
Extreme Tracker

Registered: 01/13/11
Posts: 4236
Loc: Hamilton
Really wanting the AI version of the -08 as well...
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#7104697 - 03/08/18 07:21 AM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
patriot07 Online   content
Veteran Tracker

Registered: 11/06/11
Posts: 2370
Loc: Royse City, TX
Originally Posted By: FiremanJG
Originally Posted By: patriot07
About how many grains of powder does 7-08 AI use with a 150?


Depends on what powder.

Up to 47.0 gr. nuts
Just wondering in general - wanted to do a recoil calculator to compare with 6.5 CM. Surprisingly close for pushing those weights of bullets that fast out of a short barrel.

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#7104708 - 03/08/18 07:28 AM Re: 7mm-08 A.I. continues to impress. [Re: FiremanJG]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 24521
Loc: Wolfe City, TX
Recoil is nothing to be concerned with for this cartridge. About the same as a standard 7mm-08, and my wife and oldest dughter have shot that one numerous times.
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