22GT load data

[Hondo64d]

So, I loaded up five 68gr Hammer HHTs for the .22GT. One charge each from 38.4 to 40gr H4350 in .4gr increments, in order to find max pressure. Only made it through the first three rounds before getting ejector marks. But they are smokin’ fast and those three rounds with three different charges went into about .25”.

John

 

[Guns&WhiteWater]

Good to know. I have some of those 68 HHT’s on the way, plus some of the 63 grain Absolutes. Wasn’t sure which powder to use for the Absolute Hammers.

 

[4O6shootist]

I shot the 73gr absolutes in my 22cm few years ago, case was topped off with rl26, and used my vibrating media tumbler to settle the powder to make room for seating. They shot surprisingly well at 3750fps.

 

[usmc45]

Hondo….. wondering if you have tried Vargert or 8208 with those 68gr hammers? Been looking at the same load for my 22GT, interested how your development is going.

 

[Hondo64d]

Hondo….. wondering if you have tried Vargert or 8208 with those 68gr hammers? Been looking at the same load for my 22GT, interested how your development is going.

I have some Varget and N150 but haven’t tried them with the 68gr HHTs yet. When shooting 77gr TMKs, Varget pressured out at a significantly lower velocity than H4350.

John

 

[357Max]

I've got a wild hair up my ass to try something.

Ramshot Grand + 95 SMK

Going to use Ramshot Magnum reduced to start. The Grand is similar burn rate, but more energy.

 

[Safety_3rd]

Okay a little help here. I picked up a 22GT barrel from the hide. 7 twist, and .120 freebore... is that right? I feel like the freebore is much shorter than the .169 I have been reading. Any recommendations on load development? I have a ton of H4350 and 88eldm. Dont mine buying new bullets but would prefer to stick with 4350 if possible.

 

[JR1200W3]

Okay a little help here. I picked up a 22GT barrel from the hide. 7 twist, and .120 freebore... is that right? I feel like the freebore is much shorter than the .169 I have been reading. Any recommendations on load development? I have a ton of H4350 and 88eldm. Dont mine buying new bullets but would prefer to stick with 4350 if possible.

Buy Berger 85.5's. Seat 25 thou off the lands. Start at 32gr, work up .5gr increments to see where speed and pressure is. Chances are very good you'll find a competitive load as long as the barrel isn't a dud.

 

[Safety_3rd]

Okay I have virgin alpha brass and some CCI 450's. I like speed, but if an extra 50 FPS is going to burn my barrel out 20% faster I'd rather not? What kind of velocities are you getting with the 85's? I've got a 22" barrel

 

[JR1200W3]

I was loading 35 grains of 4350 and that started at 3170 but kept creeping up until I was over 3,200. I backed a half a grain out of it and took it to the last match where I was still 3190. I'm not even going to try to think about barrel life with this cartridge

 

[padom]

I know some have had good results with H4350 but I had way better results with n550 and imr4166

 

[Safety_3rd]

Appreciate the feedback. Going to knock some load development out this weekend

 

[usmc45]

Anyone done anymore work with the 68gr class of bullets. I saw the one guy that used H4350 with pretty decent results. Wondering if anyone has tried anything else as far as powder goes.

 

[806guns]

Anyone done anymore work with the 68gr class of bullets. I saw the one guy that used H4350 with pretty decent results. Wondering if anyone has tried anything else as far as powder goes.

I would use varget

 

[Rugerjim]

I'm using a 69/75/77/80gr Rexem and I will be using 2206H for the lighters and maybe varget (2208) for the 80's. Contrary to a lot of popular belief the 2206H commonly hold EXTREME SD's and ES's in the 69 grain range with 223/GT/BR and even the creedmoor. I got my 20 shot string down to an ES of 4 with a 69 and 2206H in my 223. Still spinning up my 22 GT now and I'll report back how it goes. But I have a bit of a love affair with 06H at the moment.

 

[JR1200W3]

I'm using a 69/75/77/80gr Rexem and I will be using 2206H for the lighters and maybe varget (2208) for the 80's. Contrary to a lot of popular belief the 2206H commonly hold EXTREME SD's and ES's in the 69 grain range with 223/GT/BR and even the creedmoor. I got my 20 shot string down to an ES of 4 with a 69 and 2206H in my 223. Still spinning up my 22 GT now and I'll report back how it goes. But I have a bit of a love affair with 06H at the moment.

Can you translate that to American Engrish without all the metric nomenclature? Or will your toilet flush backwards?

 

[Rugerjim]

Can you translate that to American Engrish without all the metric nomenclature? Or will your toilet flush backwards?

Sure thing mate!
Yeah nah yeah.. so...
So when out yonder beyond the black stump and gettin up the dogs with the stick.

My powders of choice at the moment in many of those wildcats is 2206H (H4895) and 2208 (Varget.)
I was running 2209 (H4350) in my 22 Creed for ages with a 75 but found I just got near as good velocity but fantastic ES/SD's and accuracy using H4895. Same as in my 22-243 and 22-243AI. My 22 GT will be here in about 2 weeks and I'll be right on it.
Rexem is an Aussie brand of projectile manufacture that are just deadly.

So blimey mate hopefully that clears it up for any flammin' galahs on here.

 

[JR1200W3]

Sure thing mate!
Yeah nah yeah.. so...
So when out yonder beyond the black stump and gettin up the dogs with the stick.

My powders of choice at the moment in many of those wildcats is 2206H (H4895) and 2208 (Varget.)
I was running 2209 (H4350) in my 22 Creed for ages with a 75 but found I just got near as good velocity but fantastic ES/SD's and accuracy using H4895. Same as in my 22-243 and 22-243AI. My 22 GT will be here in about 2 weeks and I'll be right on it.
Rexem is an Aussie brand of projectile manufacture that are just deadly.

So blimey mate hopefully that clears it up for any flammin' galahs on here.

You're like the 45-90 from downundah

 

[st1650]

Thinking about retiring my 204R for a 22GT to have more of a dual use coyote/short range deer stick.
Local shop has a really good deal on a 20in carbon wrapped anti prefit
I can get N550 but I have a fair amount of H4350 on hand.
I suppose if I don't really care about barrel life, N550 would be the most optimal for 77 LRX and 80.5 Berger ?
Thinking about running about 2.50" coal, 34-35gr N550, Alpha brass, CCI 450 ... seems like the easy button... hoping to hit 2950 FPS with a 800-1000 rounds barrel life

Also got N555 on hand ... maybe I should start with that or is that too slow of a burn rate for the 77 LRX ?

 

[357Max]

Thinking about retiring my 204R for a 22GT to have more of a dual use coyote/short range deer stick.
Local shop has a really good deal on a 20in carbon wrapped anti prefit
I can get N550 but I have a fair amount of H4350 on hand.
I suppose if I don't really care about barrel life, N550 would be the most optimal for 77 LRX and 80.5 Berger ?
Thinking about running about 2.50" coal, 34-35gr N550, Alpha brass, CCI 450 ... seems like the easy button... hoping to hit 2950 FPS with a 800-1000 rounds barrel life

Also got N555 on hand ... maybe I should start with that or is that too slow of a burn rate for the 77 LRX ?

I haven't tried the N550 yet. RL 15.5 has been pretty available and would be in the sweet zone for 77 class.

 

[YBPS]

Thinking about retiring my 204R for a 22GT to have more of a dual use coyote/short range deer stick.
Local shop has a really good deal on a 20in carbon wrapped anti prefit
I can get N550 but I have a fair amount of H4350 on hand.
I suppose if I don't really care about barrel life, N550 would be the most optimal for 77 LRX and 80.5 Berger ?
Thinking about running about 2.50" coal, 34-35gr N550, Alpha brass, CCI 450 ... seems like the easy button... hoping to hit 2950 FPS with a 800-1000 rounds barrel life

Also got N555 on hand ... maybe I should start with that or is that too slow of a burn rate for the 77 LRX ?

I’m shooting 39grains of N555 with 75eldm, CCI 450, in a 22” 1:8 barrel, Gap Chamber @ 3190.

 

[st1650]

I’m shooting 39grains of N555 with 75eldm, CCI 450, in a 22” 1:8 barrel, Gap Chamber @ 3190.

 

[st1650]

I’m shooting 39grains of N555 with 75eldm, CCI 450, in a 22” 1:8 barrel, Gap Chamber @ 3190.

Is it quite compressed at that charge ? QL shows 109% fill rate at 2.50 coal.