20BR barrel length

[Ernie]

I like the 55's. I have killed coyotes pd's, and steel with mine.
My McGowen shoots really good.

 

[Sharpshooter243]

I like the 55's. I have killed coyotes pd's, and steel with mine.
My McGowen shoots really good.

Did you have to send in dummy rounds for them when you had the barrel made or did they have the reamer already?

 

[Ernie]

McGowen did not chamber or fit this barrel. I bought it as a blank.
A gunsmith did. Aaron Alexander

 

[Sharpshooter243]

@Ernie what is your process for making 20BR brass?

 

[chav0_12]

Does Berger still make the 55gr in 20 cal?

They have them on Grafs. Word is they made a bunch of them and that's where they got sent. They're there until they're gone.

 

[Ernie]

@Ernie what is your process for making 20BR brass?

I neck down Lapua 6 BRbrass. Depending on the reamer you may need to do some outside neck turning, depending on the chamber

 

[Sharpshooter243]

I neck down Lapua 6 BRbrass. Depending on the reamer you may need to do some outside neck turning, depending on the chamber

Just use Redding bushing dies in 6mm BR/22BR? Should I get both a neck sizer and full length? Or just neck and body die?

 

[Ernie]

I still need to confirm, but I believe I am using a Redding 6BR FL die with a bushing neck, and we did neck turn. Not sure what bushing I use, until I lay me eye on it.
BTW: Dan Ekstrom did the shooting on that itty-bitty group at 100 yards off of a Harris Bi-Pod and small field bag under the pistol grip.
E

 

[L.Sherm]

My 20BRAI is a no turn necking down Lapua 6BR brass. My loaded rounds are .2325 and my chamber neck is .236

 

[Ernie]

25.6" drop at 500 is pretty good, with a 200 yard zero.
29.1 with a 100 and sea level

I just noticed you have a 200 yard zero.
I should have noted, that my XP-100 has a 100 yard zero.
With a 200 yard zero (4500 feet of elevation & 70 degrees) my 15" 20BR with the 55 Berger has 30.3 inches of drop at 500 yards.

 

[L.Sherm]

25" at 500 for 200 yard sea level
29" at 500 for 100 yard sea level

 

[L.Sherm]

I just noticed you have a 200 yard zero.
I should have noted, that my XP-100 has a 100 yard zero.
With a 200 yard zero (4500 feet of elevation & 70 degrees) my 15" 20BR with the 55 Berger has 30.3 inches of drop at 500 yards.

What calculator are you using because when I put your info in the Berger calculator it shows 35" drop with 200 yard zero at 500 yards 70 deg 4500' elevation at 3173fps.
When I just change my velocity 3750fps
It comes out to 23.4" drop at 500

 

[Ernie]

Using Shooter

 

[Ernie]

My Holland data, puts drop at 7.5 MOA at 500 yards, 4500 elev, and 70 degrees with a 100 yard zero, while Shooter has me at 6.8 MOA.
I must have some data wrong somewhere in Shooter