Another Custom XP-100

Ernie Bishop

After trying my hand at a local PRS match back last spring...See old thread: https://forums.gunsandammo.com/discussion/42352/the-surprising-20-caliber-cartridges

I wanted to be a little more competitive with the rifle guys, especially in the wind drift area, but I wanted to do it with a specialty pistol. 

The challenging part of PRS or NRL matches is you do not have a spotter.

You have to spot your own shots, which is difficult with a center-grip XP, and it is much easier with a rear-grip specialty pistol.

What is a guy to do?

Build both in the same chamber.

I had already shot a 22 Creedmoor (Curmudgeon for some here) in a center-grip XP during a PRS match and it didn't work well.  It was too much.  

A cartridge that came out fairly recently was the 6 GT, which is also called the 6mm Gay Tiger-No joke.

It works in standard SA magazines well with requiring modifications, and it in in the powder range for a long throat life, and very little recoil when shooting from odd positions quickly at distance.

No matter how good your muzzle brake is, it does not start working until after the base of the bullet has cleared the muzzle, so bullet weight does have a bearing on initial recoil impulse.

I wanted to lower my bullet weight, so I decided to go with the 22GT.

85.5 Berger, 88 ELD-M (G1.545 and G7 .274), and 90 grain A-Tips.

7T Hart Heavy barrel, that is just under 16", and a Holland Radial Baffle brake.

Load development is not done, and I don't have any MV's yet.

The rear grip has a Kauger Arms action with a rear grip chassis, and because of it's weight and because it is a rear-grip, I will be able to see my impacts.

My guesstimate with the rear-grip that has a 18" barrel should give me around 2900 fps 85.5 Berger (G7 BC of .268), and with a 100 yard zero, should be around 8.25 MOA at 500 yards with a wind drift for a 10 MPH FV wind is 2.5 MOA or 13 inches.

750 yards: 16 MOA with a 4 MOA wind or 31.5 inches correction.

If you put the 90 grain A-Tip in the MIX the number get kind of awesome, since the BC is really good!

.295 G7 or 585 G1 at mach 2.25 or velocities above 2,500 fps.

these number have been proven multiple times by actual shooting.

To compare the 108 grain ELD-M 6mm bullet also at mach 2.25 has BC's .536 G1 and .270 G7

Now, I have not done load development on the center-grip yet, and I have even shot the rear grip, but here is a picture and video of the center-grip.

A local gunsmith who shoots PRS, and already had the 22GT reamer built both of these for me. 

I am using Alpha brass.

I also have some Hornady 6GT brass as well that I can neck down.

I wonder how good the 88 grain ELD-M would work on deer???

bullsi1911

[quote] A cartridge that came out fairly recently was the 6 GT, which is also called the 6mm Gay Tiger-No joke. [/quote]

FABULOUS!!

That is a good looking gun.  Got any pics of the cartridge alongside other known rounds?

Ernie Bishop

http://bulletin.accurateshooter.com/2019/09/sunday-gunday-new-6gt-cartridge-tested-in-3-tactical-rifles/

https://www.loaddevelopment.com/6mm-gt-or-6gt-the-new-6-on-the-block/

This is the 6GT...only difference is the neck diameter.

At least you can see some comparison.

Tom Jacobs is a friend.

Ernie Bishop

bullsi1911

Best cartridge name since the .45 SMC

Zee

I’ll hold your beer. 

JKP

Great looking SP. Will be interested to see your results with that cartridge. Of course 6.5 CM would be much better based on Zee's feedback...

Ernie Bishop

JKP said:

Great looking SP. Will be interested to see your results with that cartridge. Of course 6.5 CM would be much better based on Zee's feedback...

He just doesn't care for boutique cartridges...Oh wait!

Factory 6GT ammo will soon be out

https://www.gaprecision.net/ga-store/ammo.html

Zee

Still boutique. 

Ernie Bishop

I like boutiques....

You just keep on shooting your m-a-n-y 6.5 Curmudgeon's.

It may be more of a man-bun cartridge than the GT

Zee

Ernie Bishop said:

I like boutiques....

Ernie Bishop

I was waiting for that...I can almost see your face as you were looking for your response

Zee

😘

Wambli Ska

That is a beautiful SP 😍

Ernie Bishop

Wambli Ska said:

That is a beautiful SP 😍

Thanks!
You can shoot it this summer, if.....

Bigslug

My bullet casting mystifies you. . .

Your specialty pistols mystify me. . .

Rock on sir!  Rock on! 

Ernie Bishop

We all have different preferences.

The majority of the time, for me, it will be some kind of handgun.

Ernie Bishop

Changed powder and got the neck tension right today.

Reloader 26 and the 88 grain ELD-M is now running at 2886 fps.

Now we are talking!

100 yard zero

500 yards 8.25 for drop and 2.5 MOA for  a 10mph FV wind-Impact velocity 2220

750 yards 16 MOA drop and 4 MOA for wind-impact velocity is 1925 fps

1K 25.5 MOA and 5.75/Impact velocity 1657

These are some great number.

Once I move to the 90 grain A-Tip for steel matches, it gets even sweeter.

Zee

A couple weeks away from finding out it’s terminal potential. 

Ernie Bishop

IF, the A-Tip runs the same MV (2 grains difference in weight).

500  8 MOA  and 2.25 MOA

750 yards 15.5 and 3.5

1K 24.5 and 5

Ernie Bishop

Zee said:

A couple weeks away from finding out it’s terminal potential. 

I am definitely curious about that bullet on game.

Zee

I think we will start at 200 and see the results. Go from there. 

Zee

That’s a 2,600 fps impact velocity. If that goes well, we may look to 2,400 fps (350yrds). 

Ernie Bishop

Windy and coldish day (cold with the wind-Temps were not that bad).

Right now we have wind at 24 mph gusting to 38, but it wasn't that bad when I was shoot.

I did have to correct for up 10 MOA of wind at grand, but more often it was closer to 8 MOA.

These non-fireformed loads because of tight neck tension of the new brass didn't do great on paper at a grand, but did better than I expected to day...Maybe the wind just luckily fixed it for me the majority of the time. 

My drops were on too, which is always good.

I was shooting at a 5" square target at six, and had consistent hits-More than 4 as I was finishing up.  That was the most enjoyable part of it.

It did take one, maybe two to get wind down.  One time it pushed it way off as a gust hit.

Main thing is that I had fun!

My brass is fireformed, and I got some trigger time in while playing in the wind.

Because of the wind conditions, I am not considering this a drop confirmation.

Yet, I know it is really close

That will happen on a calmer day.

Fun Morning!

Zee

We’re you day drinking?
The text?!?😳
That post was painful to read!!!  Haha!


😆

Ernie Bishop

Zee said:

We’re you day drinking?
The text?!?😳
That post was painful to read!!!  Haha!


😆

Well, Maybe I was off my meds...

Or

I was in a hurry, distracted, and a little giddy.

Plus, I didn't check to see how the voice-to-text played out.

Day drinking would be water, coffee (to much coffee???), and unsweetened ice tea.

Kind of boring in the drinking department.

Yes, it is a scrambled mess-I will try to be easier on your brain next time.

Wambli Ska

Ernie Bishop said:

Zee said:

We’re you day drinking?
The text?!?😳
That post was painful to read!!!  Haha!


😆

Well, Maybe I was off my meds...

Or

I was in a hurry, distracted, and a little giddy.

Plus, I didn't check to see how the voice-to-text played out.

Day drinking would be water, coffee (to much coffee???), and unsweetened ice tea.

Kind of boring in the drinking department.

Yes, it is a scrambled mess-I will try to be easier on your brain next time.

Pictures work best...  Simple ones, big strokes, basic colors  

Ernie Bishop

For my own good, my brother points out my ramblings😍

Ernie Bishop

These are the numbers on the Hornady 88 grain ELD-M (22GT). 

It doesn’t get much better than that. 

Zee

Wambli Ska said:

Ernie Bishop said:

Zee said:

We’re you day drinking?
The text?!?😳
That post was painful to read!!!  Haha!


😆

Well, Maybe I was off my meds...

Or

I was in a hurry, distracted, and a little giddy.

Plus, I didn't check to see how the voice-to-text played out.

Day drinking would be water, coffee (to much coffee???), and unsweetened ice tea.

Kind of boring in the drinking department.

Yes, it is a scrambled mess-I will try to be easier on your brain next time.

Pictures work best...  Simple ones, big strokes, basic colors  

Damn. You’re on a roll!  🤣

Zee

Ernie Bishop said:

These are the numbers on the Hornady 88 grain ELD-M (22GT). 

It doesn’t get much better than that. 

That’ll work. Time to kill things.