22GT load data

[Hondo64d]

Shot these five at 800 yards yesterday. 35gr H4350 behind 88gr ELD. As expected, barrel has sped up a bit. This load is doing 2930 from 20” barrel. Black dot is about softball size for reference.

Shot this sow with same load this evening at about 175 yards. Muddy spot is POI. No exit wound, but 88gr ELD did the trick. DRT. Sow is longer than the rifle and weighs every bit as much as I do.

John

 

[Hondo64d]

I’ve seen where folks have had good results with R26, but has anyone tried H1000 in the .22GT yet?

Thanks,

John

 

[Krob95]

No, but I'll be trying 4831sc again with the 88's or 90's. Anyone tried the 90gr SMK's in their 22GT's?

 

[just browsing]

No, but I'll be trying 4831sc again with the 88's or 90's. Anyone tried the 90gr SMK's in their 22GT's?

Yes. The group sizes are comically small. I’m actually ditching my 85.5s because they’re shooting so well.

Think I ended up at 33.8gr 4350 around 15-20 thou. The little cluster in the bottom right quadrant of the target is a 10 round group… I picked out an existing hole in the paper and that was the result.

 

[Krob95]

How fast??

 

[just browsing]

How fast??

Ran them up to 3150 pretty easily. Settled around 3075. No jacket failures in a 6.5 twist.

 

[Krob95]

Awesome, I'll be running them in a 7.5 twist. Gonna try and get them in the 3150 range as long as they shoot good at that speed

 

[John Glidewell]

No, but I'll be trying 4831sc again with the 88's or 90's. Anyone tried the 90gr SMK's in their 22GT's?

Yes. posted on pages 3 and 4. Padom posted his results too.

 

[Krob95]

Yes. posted on pages 3 and 4. Padom posted his results too.

Yeah I seen that. I remembered after I asked.

 

[bodhisafa]

What arbor press seater are you guys using?

 

[Hondo64d]

Tried some StaBall 6.5 behind 80gr Amaxes in necked down Hornady 6GT brass yesterday. Weirdest thing I’ve ever seen. Apparently it does not pressure up fast enough for the brass to seal the chamber good. Powder was flowing between the brass and the chamber wall, enough that it left divots in the brass on both the body and the shoulder, and some even made it back to the bolt face. Thought maybe a hotter load would prevent this but not so. It did it even with loads that left an ejector mark on the case head, about 1gr over max. Anyone ever have this happen with StaBall 6.5?

John

 

[browning442]

John, I had that happen with some low end loads of RL15.5. Carbon formed in the shoulder of the chamber I had to clean out. With loads closer to moderate pressure it went away. I know you asked about staball, but I haven’t had this happen in other cartridges with lower pressure loads. Interesting observation.

 

[Krob95]

Odd because it's similar to 4350 in burn rate I thought. Id you’re on the 22GT group on Facebook, I would ask there too

 

[Hondo64d]

Odd because it's similar to 4350 in burn rate I thought. Id you’re on the 22GT group on Facebook, I would ask there too

A little slower than H4350. More like IMR-4831 or R19.

John

 

[Krob95]

Huh. I ran from 35 to 39gr of h4831sc and never experienced any sort of issue with burn efficiency. And 35gr was very light. Granted I was running a 95gr smk. But still.

If you have Varget or something equivalent, I would try that with the 80gr amax's

 

[just browsing]

I will say my chamber develops gnarly carbon rings even with normal 4350 charges. Seems the neck length on the spec reamers is a little too long for the brass and is allowing building in the neck area. I and at least 3 other guys have had the same issue. Takes an overnight soak in C4 and an hour worth of scrubbing to get it clean.

 

[Krob95]

30min to an hour of clr, a drill, universal hoppes cleaning rod, and nylon ar-15 chamber brush knocks that out quickly. My 6BR used to be like that too. 250rounds or so and it would get a nasty pressure spike from the carbon ring.

I've also used this on my previous 22GT barrel as well with no issues.

 

[Hondo64d]

Huh. I ran from 35 to 39gr of h4831sc and never experienced any sort of issue with burn efficiency. And 35gr was very light. Granted I was running a 95gr smk. But still.

If you have Varget or something equivalent, I would try that with the 80gr amax's

I have tried the StaBall with 88gr ELD-Ms and not noticed any blow by, and got some pretty good groups, but they were not repeatable and velocity ES pretty abysmal.

Have some loaded up to try in my 6.5CM, but if I don’t get good results there, I’m done with it.

John

 

[Krob95]

ought to be fine in your creedmoor

 

[usmc45]

I will say my chamber develops gnarly carbon rings even with normal 4350 charges. Seems the neck length on the spec reamers is a little too long for the brass and is allowing building in the neck area. I and at least 3 other guys have had the same issue. Takes an overnight soak in C4 and an hour worth of scrubbing to get it clean.

Wondering if this is whats happening to me. I get get through about 40 rounds of a pretty mild charge of 4350 and all of the sudden i start getting hard bolt lifts and ejector marks. Had GAP chamber it and even sent it back to them for a second look. Still doing it but its on virgin brass so i was hoping it resolves after the initial firing. How many rounds before you start having issues?

 

[357Max]

FWIW I just ran 80 rounds fire forming virgin Alpha brass. Load was 37.5 of 6.5 Staball with 88's @ .023 off the lands 3050 (random pick). Cleaning after was a bit of a chore.

Aside from them all hang firing, the necks sealed well. No carbon on cases at all. Put 20 in .9 @ 100y. I think the old ass Wolf primers caused the hang fires. Previously with GM205's they all lit fine.

 

[just browsing]

Wondering if this is whats happening to me. I get get through about 40 rounds of a pretty mild charge of 4350 and all of the sudden i start getting hard bolt lifts and ejector marks. Had GAP chamber it and even sent it back to them for a second look. Still doing it but its on virgin brass so i was hoping it resolves after the initial firing. How many rounds before you start having issues?

Experimenting with that now. Barrel has 1200+ rounds on it so that could be playing a factor, but it looks like it’s going to end up around 300 rounds for me. Definitely not 40 though, that seems extreme.

I will say mine was OK for like the first 600 rounds with no cleaning, and then I started getting crazy pressure spikes, missing targets high, and having hard chambering/bolt lift issues. Obviously it’s best not to let it get that bad.

For anyone that runs into similar problems though, I would start there. And when you think you’ve got it clean, scrub some more. A drill helps as Krob said.

 

[Krob95]

Picked up my new GT barrel. Local store had some 8lb kegs of n555 so going to test that out. Going to break in the barrel with 88's and then run the 90's.

 

[Big Timber]

Anyone know when Alpha is going to do another run of brass?

 

[4O6shootist]

Seating depth test at 400y, 36gr H4350, 90 atips. -20 to -50 does it even matter?! What impressed me the most, was nearly no POI shift!

 

[just browsing]

36gr of 4350 has to be pushing 3200

 

[4O6shootist]

36gr of 4350 has to be pushing 3200

Not in this 219 bore, only 3110fps. 26" hawkhill hvy varm. Could be slow lot of 4350. Still on virgin brass too. Took 37.2 to get up to 3200+. My chamber is a bit off the norm, 257nk and 170 freebore. Most reamers are 255nk, but I didn't like that bullets would NOT go into a fired case unless I really forced them in. Loaded nk is around 2525-253, too tight.

 

[nrspence]

I use a PVA muzzle Jimmy and a bore scope they are both game changers for me keeping a barrel clean. I clean every 100 to 200 rounds. I soak my barrel over night with boretech c4. Then go to scrubbing with a nylon brush. Gets rid of any sign of a carbon ring.

 

[Rocklong]

I shoot 40gr of n555 behind a 75eldm at 3330fps. Case is full at 40gr. Very accurate and low es. 20” barrel

 

[4O6shootist]

I shoot 40gr of n555 behind a 75eldm at 3330fps. Case is full at 40gr. Very accurate and low es. 20” barrel

That's good info, N555 runs like a champ in my 22cm. What's your Barrel length? Curios why not the 80gr eldm, lot more bc but just a wee bit less speed.

 

[Krob95]

Got some rounds down the new GT barrel. Shot 8 and then these 7 for speed. The first 8 were 35gr for sight in and then these. Ran 88gr ELDM 20k off for this procedure. All N555.

 

[Rocklong]

That's good info, N555 runs like a champ in my 22cm. What's your Barrel length? Curios why not the 80gr eldm, lot more bc but just a wee bit less speed.

I shoot coyotes and the perform well. 20” barrel. I also use it in a 22 cm with 43.3 gr and 75 eldm

 

[Travis224]

For anyone who wants to try this as a coyote round, I have built 3 different barrels for hunting. My bullet is 60vmax using H4895. Same identical load is 3450fps in 16" barrel, 3500fps in 18" and 3600fps in 20" barrel. They all shoot great, but the fav currently is the 20" Bartlein 400bb steel carbon wrapped. I'm hoping for long life even with the highest velocity.

3 shots at 250yds is the last picture

 

[Krob95]

For those of y'all that wish to run 22GT with a HRD br kit in an AW/AW mag. The spacer needs to be filed/ sanded down to at least 0.325" towards the top. I measured the gap that I normally leave with a standard 308 follower and it was 0.329". More may be needed depending on the bullet you are using and OAL. This is for 88's at a coal of 2.546".

 

[S3th]

If y’all haven’t, try ARC AICS. I lent one to my friend who was using adjusted mag spacers. They ran flawlessly in 22GT and 6GT.

 

[357Max]

If y’all haven’t, try ARC AICS. I lent one to my friend who was using adjusted mag spacers. They ran flawlessly in 22GT and 6GT.

That's what I'm using with a Tika in a KRG X ray. They've been flawless so far.

 

[Hondo64d]

If y’all haven’t, try ARC AICS. I lent one to my friend who was using adjusted mag spacers. They ran flawlessly in 22GT and 6GT.

Been using Magpul mags with my .22GT and they feed flawlessly.

John

 

[bodhisafa]

Been using Magpul mags with my .22GT and they feed flawlessly.

John

ARC =American rifle company

Or

ARC= advance rifle cartridge

 

[S3th]

ARC =American rifle company

Or

ARC= advance rifle cartridge

ARC MAG 10-Round 7.62x51, 308 WIN

www.americanrifle.com

 

[leftyk82]

American Rifle Company

 

[Krob95]

N555. 37.5, 38, 38.3. No signs of pressure at all.
88gr ELDM's.

 

[bodhisafa]

Who makes an in line seater for the 22 GT?

 

[Varminteer]

Darn it. New project on hold. It appears new 22GT Alpha brass has become extinct.

 

[Triggerf16]

22 GT. PVA Osprey prefit.

Hornady 88ELDM
35.0gr H4350
CCI 450
Alpha OCD brass
2.556” OAL .033” off lands
3088fps SD 7

 

[leftyk82]

22 GT. PVA Osprey prefit.

Hornady 88ELDM
35.0gr H4350
CCI 450
Alpha OCD brass
2.556” OAL .033” off lands
3088fps SD 7

Barrel shoot well?

What barrel life are you expecting?

 

[Triggerf16]

Barrel shoot well?

What barrel life are you expecting?

I only have 190 rounds on the barrel. I expect 2000 rounds +/- from the barrel. Shoots as well or better than my 22BR, which shoots the same bullet, but with 29.0 Varget at 3000fps. I might go slower on the 22GT. See if I can find a node around 3020-3040fps.

 

[Big Timber]

Darn it. New project on hold. It appears new 22GT Alpha brass has become extinct.

Yeah, went looking after I received my black friday PVA barrel, and it was all gone. I had to order some hornady 6gt from Midsouth to hold me over. I think 22gt is becoming really popular.

 

[S3th]

Darn it. New project on hold. It appears new 22GT Alpha brass has become extinct.

Alpha has said that 22GT is next in line for production.

 

[S3th]

22 GT. PVA Osprey prefit.

Hornady 88ELDM
35.0gr H4350
CCI 450
Alpha OCD brass
2.556” OAL .033” off lands
3088fps SD 7

I ordered a OBW 22GT last night. Opted for 150FB and plan to shoot 85.5s around 3,025-3,050.

 

[Triggerf16]

I ordered a OBW 22GT last night. Opted for 150FB and plan to shoot 85.5s around 3,025-3,050.

I think that is the sweet spot.

I just looked up my earlier targets. At the 30 round point, that same load chrono-ed at 2942fps. Sped up to 3088 by 190 rounds, quite a change.