20 GT Anyone?

[TroyG]

I measured to the top of the neck and got 39grs of water. Random case from my fired brass.

Troy whatś the H2O capacity of those br variants. Interesting to see compared to this case. 55 Berger just couple thou deeper than NS junction which is about 2.264 OAL for AR mag.

 

[sscoyote]

Perfect!

 

[willey_coyote]

WC whatś that 55 doing to fur at closer ranges @ 3850 mv?

kinda violent on some and small holes on others. just depends on what you hit on the inside.

 

[Spook]

Having built a 20X250 and a 20BRX, Ive come to believe that the BRX case is perfect for the 55 Bergers.
The 20GT is a beauty of a cartridge though. Just a little more capacious than can effectively be utilized.

 

[Tommie]

Looks like the little brother to the @fredo Redline!

 

[sscoyote]

kinda violent on some and small holes on others. just depends on what you hit on the inside.

Yeah--nothing works perfect for all hide hunter requirements I guess. thanks.

 

[TroyG]

Being in Canada I cannot access the custom 17 bullets. If I had a life time supply of the Kinder Golds or the Berger 17 gr hpbt/LTB bullets I would've never tried a big 20. I had some raking shots on closer coyotes that opened them up from the nave to the chops. Also anchored some at 450 plus yards where the energy and bigger bullet was welcome.

 

[sscoyote]

Looks like the little brother to the @fredo Redline!

Yeah Tommie I'm gonna one up him...HA!! I'm gonna call "mine" the 20 GT...HA x 2!

 

[Bodhisafa]

Anyone have a reamer?

 

[RegionRat]

Anyone have a reamer?

https://www.gaprecision.net/6mm-gt-reamer-and-headspace-gauge-pacific-tool-and-gauge.html

 

[Bodhisafa]

https://www.gaprecision.net/6mm-gt-reamer-and-headspace-gauge-pacific-tool-and-gauge.html

Looking for a 20 GT reamer not a 6 GT reamer.

 

[RegionRat]

Just suggesting PT&G would have a decent starting point.

I’ve been trying to guess what the best parent case starting point is to push Berger 55 to at least 3600 short of doing 20-250. A friend just got his 20-Valkyrie reamer in but he hasn’t measured case capacity yet.

 

[457ciSBC]

Just suggesting PT&G would have a decent starting point.

I’ve been trying to guess what the best parent case starting point is to push Berger 55 to at least 3600 short of doing 20-250. A friend just got his 20-Valkyrie reamer in but he hasn’t measured case capacity yet.

IIRC, the 20 Valk was close to 20 PPC in powder capacity. I would have to measure again.

 

[sscoyote]

Looking for a 20 GT reamer not a 6 GT reamer.

C'mon Bodhisafa...build it! I mean heck somebody's gotta do it--don't look at me though, I'm retired.

 

[Bodhisafa]

Hypothetically, what powders would work in the 20 GT case?

 

[sscoyote]

Sorry just got back from PI. I'd think 20-250 powders. Here's a link to Dave Affleck's stuff--

The .20-250 an extreme predator cartridge – Coyote Stuff

coyotestuff.com

 

[20-practical]

Got a friend who has built a 20 GT. Waiting on more results but initial results look promising.

 

[Phil]

Following, with interest.......

 

[LoanHarvey]

Ok, I could not help wanting to follow this and build one with you guys, here is one I just finished, its like the Redline, but it is AI'd. The .224 SAUM AI......lol

 

[Phil]

Ok, I could not help wanting to follow this and build one with you guys, here is one I just finished, its like the Redline, but it is AI'd. The .224 SAUM AI......lol View attachment 1376303

Sweet