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22GT load data
- Thread starter Krob95
- Start date
It’s my sons rifle. I don’t want to push it too fast. I want him to try and spot his impacts and mitigate just a tad of recoil.
Yes, they use the same chamber length of 1.732"
100pc of 1x fired trimmed and ready to load. Gonna throw some H4831sc/95smk loads together and test out. Gonna test some 85.5 and 90smk w ith 4166 as well.
this should be interesting. I believe the 4166 is very close to N555. I am running N555 and 90 SMK. Just started, not even 100 down the tube yet but looks promising at 3140fps 37.4 grains at .025 off lands. Very interested in your results with 4831sc. But I think it may be a bit to slow burning, guess we will know soon enough.
Also, anyone looking for a 22GT sizing die, don't hesitate to buy a LE Wilson FL bushing die. It sizes like butter, fit and finish is excellent and takes Redding bushings.... very nice die, I'll be buying more.
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4166 is a fair bit faster than N555 in my experience. Falls between 4350/4831sc. I use it in my 22cr and 25cr. Full cases with good velocity and no pressure. 36.6gr H4350 gives me 3100 with 90s in my 22gt. I found 4166 to be near grain for grain same as varg but psi out 50fps sooner.
I also found it to be very interchangeable with Varget. It's shooting stupid good in my 22BR. Very interested how it runs in 22GT
Had to go look at notes.....I list 4451 as being close to N555 and 4166 close to N150. I don't run varget but it makes sense, I had them mixed.
The other one I am interested in trying is the shooters world LongRifle.
I'm curious to see what kind of G7 BC you get out of the 95gr SMK. I've heard so many people say they see .305 and .310 G7s from that bullet. I got .290 from two different barrels.
95 SMK / H4831sc small OCW loaded up. If they shoot anywhere near as good as @Krob95 load I'll be happy.
Loaded 10rd up 38gr....then 3 each 37.4, 37.7, 38.0, 38.3, 38.6 all 0.025" off the lands....no crunch.. powder still has a little room in the case to move.. hopefully I can get out tomorrow to shoot these.
I have a Bartlein 28" 1-7.5 .218 being cut to compare to this 26" 1:7 .219 OBW... I also have a HH .219 28" 1-7.5 coming as well in 6 weeks or so....
Loaded 10rd up 38gr....then 3 each 37.4, 37.7, 38.0, 38.3, 38.6 all 0.025" off the lands....no crunch.. powder still has a little room in the case to move.. hopefully I can get out tomorrow to shoot these.
I have a Bartlein 28" 1-7.5 .218 being cut to compare to this 26" 1:7 .219 OBW... I also have a HH .219 28" 1-7.5 coming as well in 6 weeks or so....
AI AT-X
28” Brux chambered by 360Precision
6.5 twist .169 fb
85.5gr LRHT (.015-.020 jump)
35.0gr H4350
22GT OCD
Velocity was 3101, spreads in the 5s with 1x fired brass. Virgin brass was about 15fps slower at 3086 with the same spreads. Barrel has about 240 rounds on it so it should be fully broken in.
This was cold bore followed by 5 rounds. That’ll do.
28” Brux chambered by 360Precision
6.5 twist .169 fb
85.5gr LRHT (.015-.020 jump)
35.0gr H4350
22GT OCD
Velocity was 3101, spreads in the 5s with 1x fired brass. Virgin brass was about 15fps slower at 3086 with the same spreads. Barrel has about 240 rounds on it so it should be fully broken in.
This was cold bore followed by 5 rounds. That’ll do.
I’ve had good luck with them too. In a number of barrels now including .223, 22BRA, and 22GT.
I did shoot them through the AB Mobile Lab Doppler with the 22BRA and was surprised to see them running a 2% BC variation. Lot to lot conformity and on-target results have been solid in my experience so I would have expected them to be significantly better than that.
The 88gr ELDs tested worse out of the same barrel FWIW… but again, they seemed to shoot fine for me in testing. Would like to try (but haven’t had a chance) 90gr A-Tips and SMKs, though with cost/availability of the Berger’s and how well they’re shooting right now I’m not in a huge rush to change things up again.
Yeh, 2% is crazy high. That surprises me as well. The highest I've seen is the 108gr ELDM that came in at 1.5%.
I've never gotten to test my 88s, but for the price there's always some trade off. I saw a 90gr Atip come in at .8. Though a decent number, I confess that for the price and marketing focus of quality control, I thought it would do better. Something .4 or .5 would have been more impressive. I'm not sure how many rounds the guy had on his barrel, in hindsight, knowing now that it effects BC, I should have asked.
Got out today to shoot 2 OCW's both at 200yd.. Not the accuracy results I was hoping for but Ill try a seating depth test next with the 95 SMK....
95 SMK / H4831sc OCW
No pressure through any of the charges. Really good, consistent single digit SD's and a nice wide consistent POI from 37.4 - 38.00... Consistently right at 0.5moa so nothing horrible.. At least it was consistent other than that 1 group at 38.3..... Ill play with seating depth to see if I can tighten up 37.7...
85.5 LRHT / H4350 OCW
No pressure with any of these charges either. Anything closer to the lands and you werent getting much of the bearing surface in the neck. I generally like to keep bullet diameter worth of bearing surface in the neck (.224).... But when I loaded up .01 off there was probably only half the neck engaging the bullet bearing surface so I seated deeper to 0.03... Either way, didnt like this combo as SD's werent great other than 1 charge weight.... Probably done with H4350, ill play with some other powders.
95 SMK / H4831sc OCW
No pressure through any of the charges. Really good, consistent single digit SD's and a nice wide consistent POI from 37.4 - 38.00... Consistently right at 0.5moa so nothing horrible.. At least it was consistent other than that 1 group at 38.3..... Ill play with seating depth to see if I can tighten up 37.7...
85.5 LRHT / H4350 OCW
No pressure with any of these charges either. Anything closer to the lands and you werent getting much of the bearing surface in the neck. I generally like to keep bullet diameter worth of bearing surface in the neck (.224).... But when I loaded up .01 off there was probably only half the neck engaging the bullet bearing surface so I seated deeper to 0.03... Either way, didnt like this combo as SD's werent great other than 1 charge weight.... Probably done with H4350, ill play with some other powders.
Haha, I hadn't heard that. My buddy has been running the same .120" as the 6mm. So I assumed it was the go to freebore. I run DTACs in my 6GT with .120. And had great luck at that length with my BR. I guess .120" is so 2021
Haha, I hadn't heard that. My buddy has been running the same .120" as the 6mm. So I assumed it was the go to freebore. I run DTACs in my 6GT with .120. And had great luck at that length with my BR. I guess .120" is so 2021
From the smith's I've talked to 0.169 is the original 22GT reamer spec and is pretty much the standard unless they had a reamer made with a shorter freebore....
the people I know running 22GT are all 0.169 freebore and their barrels are chambered by a different smith. So idkI was running 0.100 and now I'm running 0.130 in my 22BR and it's fucking perfect.
I'd start around 35gr, you'll likely end around 36-36.4 at 3120fps. The 88s shot very well there in my rifle.
From the smith's I've talked to 0.169 is the original 22GT reamer spec and is pretty much the standard unless they had a reamer made with a shorter freebore....
I was running 0.100 and now I'm running 0.130 in my 22BR and it's fucking perfect.
I tested a bunch of freebore lengths in my 22 Dasher, just working my way out with different bullets and lengths. It came down to wanting .120 to .130". So I split the difference and ordered a .125" from Manson.
Once I got to .220" with a 95gr SMK it fell off a cliff. I'll have to set it back and recut it it's so bad. I just didn't see anything that made me believe there was a need to go longer. It shot just like my BR at the shorter length with no need to get the bullet further out of the case. My BR also did well at .160, but then I came to the same conclusion there as well. .120 and .130" is money and I didn't gain anything going a little longer.
My plan is to run 88s for local funnsy stuff and experiment with the 90gr Atip for big matches.
Looking forward to hearing your thoughts with the rounds you're testing. Maybe that extra freebore is the sweet spot in the GT.
I tested a bunch of freebore lengths in my 22 Dasher, just working my way out with different bullets and lengths. It came down to wanting .120 to .130". So I split the difference and ordered a .125" from Manson.
Once I got to .220" with a 95gr SMK it fell off a cliff. I'll have to set it back and recut it it's so bad. I just didn't see anything that made me believe there was a need to go longer. It shot just like my BR at the shorter length with no need to get the bullet further out of the case. My BR also did well at .160, but then I came to the same conclusion there as well. .120 and .130" is money and I didn't gain anything going a little longer.
My plan is to run 88s for local funnsy stuff and experiment with the 90gr Atip for big matches.
Looking forward to hearing your thoughts with the rounds you're testing. Maybe that extra freebore is the sweet spot in the GT.
Yea I asked around and everyone told me 0.169 was the standard reamer print for 22GT so I went with it. Looking around, all the 22GT prints I see at Alpha, GA Precision, etc. all have 0.169 freebore
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I have and it works very well. The reamers are expensive but I have a 6 dasher and 22 gt alpha legacy reamer. I run alpha ocd brass in both.
I just got a hawk hill .219 barrel with a 7.2 twist and it shoot incredibly well.
35.1 grains of H4350
85.5 berger hybrids
Cci 400
Seated .020 off lands
3020 fps
I just got a hawk hill .219 barrel with a 7.2 twist and it shoot incredibly well.
35.1 grains of H4350
85.5 berger hybrids
Cci 400
Seated .020 off lands
3020 fps
Went shooting Saturday, when loading my magazine, I noticed this bullet had a fucked up jacket. Could very easily feel it with a fingernail. Figured I'd shoot it anyways to see what happened. Ended up landing about a full inch away from the other 4 shots. Check them Sierra's. Never know what may show up.
New PVA Bartlein 28" 1-7.5 ready to go....
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Now I'm gonna have to check my 95's more closely. Haha
I have 26" Hawk Hill in a 7.5 twist.
It's interesting that the stability factor is well under 1.5 for the long .224s. Which is kinda the established guideline for full BC via Applied Ballistics. But both my 7 and 7.5" twist barrels gave me the same verified BC at 1000 yards with several bullets. Even the long 95gr SMK gave me a verified .290 G7 BC.
And I think there is value in the slower RPM of the 7.5". I was popping the 95gr like crazy in the mid 3100's with my 22 Creedmoor with a 7 twist.
I just got mine together, running 90 SMK in 7 twist at 3150 and I had a few come apart. Going to back off a little. Next barrel will be a 7.5.
Just going up from 7 to 7.5 twist my exact same load goes from 313,000 to 290,000rpm.... did the same thing with my 22BR last month and damn that 7.5 22BR is an absolute lazer. Unbelievably accurate at 700yd which is the farthest I shot it so far...
My rule of thumb, I do my best to stay at or under 300,000 rpm
7.5 gets me to 302,00 rpm, but I will play with this and try to find the threshold. Only had 2 of 20 go last outing so I think it is right on the ragged edge. Thinking I may go to 85.5 or the 80.5 bergers and see what happens. I did not plan for the rpm on this one, lesson learned.
I never popped a bullet but I'm also conscious of keeping my rpm in check... I'm running 7 and 7.5 twist and bith 218 and 219 in 22BR and 22GT.
