22GT load data

I didnt do any 80gr testing in 22GT but I did test 80's in my 22BR and they were stupid accurate. I tested 80smk and 80 VLD with H4895

29.5gr H4895
3152
SD 5

28" Mullerworks 1-7

400yd


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I am running a 22" 7.5tw hawkhill bow4 contour hunting rifle, I remember getting 90 atips up to 3200fps with H4350 in my first 22gt. Im hoping I can run these around 3100. Well will have to see.
 
Yup, 2 barrels. Running 28.5gr Varget 90smk at 30k jump and it shoots 1/3 moa at 3040fps, 28" 7tw 219 bore muellerworks hvy varm on an origin. I literally threw that load to break the barrel in, and that's what it does. I haven't changed anything.

Same load over here same length barrel I have that same MW and also a 7.5 Bartlein. Lights out stupid accurate!
 
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After having had my 22GT replaced due to the ARC CDG clearance issue, I finally found time to do some load development. Up to this point, I have been shooting 35.0gr H4350 w/ 85.5s with a total of 133 rounds on the barrel. The load was pretty inconsistent but fairly precise and accurate. Decided to move to a higher charge, ultimately higher fill %, albeit higher than I ever intended to go with this cartridge.

All I have to say is that I found money at and above 36.0. Low sample size but the barrel has been consistent at 35.0, I am confident these 36s will be consistent too. I shot two four-shot groups for each charge and the results repeated.

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Follow up to my previous 22GT post. My barrel continues to speed up after having settled on 36.4. Now at 270 round count, I am back at the drawing board because I am running at 3,300 lol...
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How often are you cleaning? I notice mine speeds up about 45-50 FPS by time I get around 80-90 down the tube. I'm at 280 rounds on my PVA OBW. However I'm using RL23, not H4350. Clean is about 3000 and dirty is about 3050.
 
Just cleaned my brand new barrel 24" 1:8 with .169 freebore.

Going to fireform and break this in with 25rds in the morning starting with new Alpha brass, 32gr of H4350, and Berger 85.5 LRHT.
 
Just back from the range, all cleaned up.

Ran 25 rds of 32gr H4350 with an average fps so far with new Alpha brass of 2758.

Next batch will be at 33gr to continue break in.

Shoots pretty good so far, but can't wait to start load development soon.

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Was able to average 2960 with 34gr of H4350 with Berger 85.5's.

Next step now that the barrel sped up and was holding speed, I'm going to try the 90gr A-Tips, and 95gr SMK's at all 35gr to start.
 
Was able to average 2960 with 34gr of H4350 with Berger 85.5's.

Next step now that the barrel sped up and was holding speed, I'm going to try the 90gr A-Tips, and 95gr SMK's at all 35gr to start.
Moving up to 90gr A Tips and 95gr SMK's.....I know the heavier bullet uses less powder, should I keep this as is at 34gr of H4350, or bump up to 34.5 of powder to get that 3000 fps range?
 
Moving up to 90gr A Tips and 95gr SMK's.....I know the heavier bullet uses less powder, should I keep this as is at 34gr of H4350, or bump up to 34.5 of powder to get that 3000 fps range?

Hmm not sure. I shot 95 SMK with H4831sc 37.7gr gave me 2983 SD3 / ES 8 out of a PVA 26" Osprey 1-7

Honestly, H4350 was not at the top of the list of the best powders I tested in my two 22GT barrels with 90/95gr bullets.

N550 is my go to and the top of my list.. 34.5gr 3139 with 90smk SD2/ES6 0.1's @ 100yds... Every charge weight I tested from 34.3 - 35.1gr was sub half moa
 
New barrel is a Bow4 contour(essentially a 1.200" shank 3b) Hawkhill 7.5tw finished at 22" and cut with the Alpha 120fb reamer, tl3 tenon.
Load info:
Formed alpha ocd 22gt brass, 33.5 N150(cool burn) 80 eldm, cci450
Inital Velocity: 3140, after 65 rounds: 3185
No psi signs.

ES of 5 shot groups on avg: 20-30, not great, will likely move to H4350 or RL15.5 after break in, with 85.5 Bergers.

I planned to shoot lighter bullets with the short barrel for velocity purposes, hence short freebore. I may throat it, as the 77tmk has a very long bearing surface. 85.5 Bergers, 80/75 Eldm sit very well in the neck with the short freebore. The 77tmk, 88 eldm and 90 atip all have maybe 20-30k of seating depth adjustment before the bearing surface is going below the neck shoulder junction.

Start up load, 33.5gr N150 with 80gr eldm, I have approx 65 rounds on the barrel and has speed up about 40fps thus far, with no cleaning, other than scrubbing out the chamber and barrel after receiving it from the smith.
Velocity is currently around 3180 and it's shooting very well. I loaded up 100 rounds, first 15 rounds were just firing all the dummies that I made to find lands if possible bullet candidates. I started with a seating depth test on the 80 eldm -10k to -73k jump in 007 steps. The barrel is shooting very well this far, 5 shot groups averaging half moa, some in 3s and 4s, others in 6s and 7s. The -10 group(not in picture) and -38/-45 groups look very good. I'll likely seat the remaining 50 rounds to -40 to finish inital break in following a barrel scrub. Attached target is 1/4" grid.
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I recently went from Berger 85.5 and tried the 90 Atips, and 95gr SMK's......going back to the Bergers.....I'll need to try different powders.
 
Found a charge that shoots well in both of my Bartlein 5R 1:7 barrels. Both are 20” barrels, one an M24 and the other a 3B.

35.6 gr H4350 behind a Berger 85.5 shot the .216” group out of the M24 contour and the same charge behind the 88gr ELD-M shot the .452” group from the 3B contour. Four of the five in the 3B group went into .127.”

John

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Also, anyone had virgin alpha 22gt brass fit tight in a chamber cut with an alpha 22gt reamer?
Not at all. I haven’t really cleaned any brass yet on my 22GT because of round count to break in the barrel, but haven’t run into any issues at all with respect to chambering new brass. I had it cut for the Alpha brass as well.
 
I use Alpha brass in chambers cut with an Alpha reamer and it’s pretty snug, but not so much that I have any issues with bullet release.

John

This is in the body taper. 22gt reamer seems to be .460 at shoulder where 6gt reamer is .261. And if the 22gt brass is snug around the body.

Not the base though. Checked that. It's contacting in the middle web area.



Which is how you end up with clickers. Body or base contact.
 
Not at all. I haven’t really cleaned any brass yet on my 22GT because of round count to break in the barrel, but haven’t run into any issues at all with respect to chambering new brass. I had it cut for the Alpha brass as well.

Have you tried it with just the barrel off and dropping brass in? Or just chambering with your bolt?

Thanks.
 
This is in the body taper. 22gt reamer seems to be .460 at shoulder where 6gt reamer is .261. And if the 22gt brass is snug around the body.

Not the base though. Checked that. It's contacting in the middle web area.



Which is how you end up with clickers. Body or base contact.
I’m using an RCBS Matchmaster 6GT die and am not having any issues with clickers.

John
 
I found my best loads at 37.4gr of N555 with the 85.5gr Bergers with SD of 4 and the 37.2 has an SD of 5 at 37.2gr of N555.

I'm guessing that is the best node since I was stacking rds at 500yds with a 5" plate.
 
Found a charge that shoots well in both of my Bartlein 5R 1:7 barrels. Both are 20” barrels, one an M24 and the other a 3B.

35.6 gr H4350 behind a Berger 85.5 shot the .216” group out of the M24 contour and the same charge behind the 88gr ELD-M shot the .452” group from the 3B contour. Four of the five in the 3B group went into .127.”

John

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35.6gr H4350 behind 88gr ELD-Ms just flat works in my .22GTs.

John

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I started with H4350 and wound up going with 37.4gr of N555 with the Berger 85.5. I’m using a slightly longer 24” barrel. These were stacking rds at 500 on a 5” plate.

If it’s working in your barrel go with it. Don’t look back.

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Anyone tried H1000 in there .22GT? Results?

Thanks,

John
I doubt that's even remotely possible. I bet you could pour 4831SC up to the brim, vibrate for 6 days, add 12 more kernels, scrape the top off with a butter knife, seat with a bottle jack and not hit pressure. Much less H1000. 44gr of H4831SC is %100+ capacity, crunchy, and still not pressure in a 22 Creedmoor.
 
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I doubt that's even remotely possible. I bet you could pour 4831SC up to the brim, vibrate for 6 days, add 12 more kernels, scrape the top off with a butter knife, seat with a bottle jack and not hit pressure. Much less H1000. 44gr of H4831SC is %100+ capacity, crunchy, and still not pressure in a 22 Creedmoor.
I‘ve seen folks using R26, so thought I’d ask. Anyone who’s actually tried it?

John
 
Close to RL26 (148) vs H1000 (149) on the burn rate chart.
Was getting low on my keg of RL26 (before finding Triple Nickel).
Ran a velocity test of 34.7 thru 36.2 ( S/Ds were trash on the low end).
36.2 gr was S/D 3, Spread of 8 and average Velocity 2910 (25 inch barrel And 88 ELD-M).
Only got so-so results at distance and for me it wasn’t RL26 (or a decent sub) so moved on…
Found another keg of RL26, I’m good…
 
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H1000 and RL26 aren't the same. RL26 is double based and reacts differently than H1000. H1000 is too slow for 6 Creed and 22 Creed. Yet RL26 works in both.

I have a 22GT, 88's, H1000, and a 25" barrel. I'll load it until it crunches and shoot it. My prediction is it won't break 3000fps.
 
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