QL - 22 GT

[frankm]

Could someone run a QL on a 22 GT ? Don’t know if brass capacity is available but I could measure some or find a web based estimate if needed.

Here’s basic info:
22 GT (necked down 6 GT)
Small rifle primer
2.520 OAL
88 gr Eldm
27” barrel

Would like to run for IMR4831 and R23. Go to 64000 psi

Thx for any help/expertise!!

 

[frankm]

Did some research and 22 GT has a couple grains more capacity that a Dasher and a wee bit less than a standard 22-250. Hopefully this helps

 

[frankm]

Measured a 22-250 case vs a 22 GT and only 2-3 tenths less capacity. Could call it a half grain to be conservative.

Thx in advance for help!!

 

[frankm]

Anyone want to take a shot at this QL? Thx

 

[jimbires]

I don't have a 22GT or a 6GT .

 

[frankm]

Possibly hasn’t gotten into QL yet?

 

[DrMike]

The cartridge is not found in any of my data bases.

 

[SJB358]

Measured a 22-250 case vs a 22 GT and only 2-3 tenths less capacity. Could call it a half grain to be conservative.

Thx in advance for help!!

If it’s that close to a 22-250 Frank I’d be fine with starting at starting charges and working up from there. .3 of a grain doesn’t amount to much and capacity is capacity. Just my thought.

 

[frankm]

Scotty, agree with you. We ve got 4 of these rifles built (4 guys) and have found good loads and have in excess of 1000 rounds down range.

My hope was that it was in the QL calculator to see what it forecasted for pressure. Since it’s Alpha Brass produced for GAP and small primer, really hard to know what kind of pressures we re running. That was what I was hoping to get modeled in QL.

Would it be a fair comparison, or totally apples and oranges, to model a standard 22-250 with these same component choices and then “say” it s relatively applicable to a 22 GT with the same powder charges?? Overall case capacity very similar BUT one case is short and fat vs one that is longer and skinny. Hopefully my explanation/questions are understandable. Thx for thoughts. This is what keeps us up at night “thinking what if” !!
Frank

 

[jimbires]

there was a guy asking for load info on the long range hunting forum , yesterday . another guy said snipers hide forum had a bunch of info on it . you might want to check there for info .

 

[SJB358]

Frank I’d be good with a simulation of the H20 capacity of the 22-250 to the same as the GT. I’m not sure case shape makes as much difference for pressure as sheer capacity.

If I think about it tonight I’ll run a couple for you if you list bullets and powder you’re using.

One of these fellas might beat me it to.

 

[jimbires]

a couple more guys responded . here is a link if you're interested .

22 GT; anyone with experience care to share thier experiences, general load & ballistic info. I’m considering a build.

I’m thinking about building a 22 GT and can’t find much data on it even though brass is manufactured for it. I’ve exchanged info with one shooter who loves thier 22GT build. I would be shooting heavy for caliber bullets 80-90 g. Use would be mainly for fun, varmits. I have a PRS build in 6mm...

www.longrangehunting.com

 

[frankm]

Scotty, that d be much appreciated!! Could you run a std 22-250 with the following:
88 ELDM
2.620 oal
IMR 4831
R23
Could you run to 64K max pressure?

Appreciate it. Will be interesting to see how it compares to our load work ups to date!!
Frank

 

[DrMike]

Cartridge : .22-250 Rem. (SAAMI)
Bullet : .224, 88, Hornady ELD-M 2283B
Useable Case Capaci: 38.868 grain H2O = 2.524 cm³
Cartridge O.A.L. L6: 2.620 inch = 66.55 mm
Barrel Length : 28.0 inch = 711.2 mm
Powder : IMR 4831

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 94 32.22 2896 1638 44856 8238 99.6 1.439
-09.0 95 32.58 2925 1671 46342 8294 99.7 1.417
-08.0 96 32.94 2954 1705 47876 8345 99.8 1.397
-07.0 97 33.29 2982 1738 49459 8393 99.9 1.377
-06.0 98 33.65 3011 1771 51094 8436 100.0 1.357
-05.0 99 34.01 3039 1805 52782 8475 100.0 1.337
-04.0 100 34.37 3068 1839 54526 8511 100.0 1.318 ! Near Maximum !
-03.0 101 34.73 3096 1873 56328 8546 100.0 1.300 ! Near Maximum !
-02.0 102 35.08 3124 1907 58189 8579 100.0 1.281 ! Near Maximum !
-01.0 103 35.44 3152 1941 60111 8613 100.0 1.263 ! Near Maximum !
+00.0 104 35.80 3179 1975 62099 8645 100.0 1.246 ! Near Maximum !
+01.0 105 36.16 3207 2009 64153 8677 100.0 1.228 !DANGEROUS LOAD-DO NOT USE!
+02.0 106 36.52 3234 2044 66277 8709 100.0 1.211 !DANGEROUS LOAD-DO NOT USE!
+03.0 107 36.87 3261 2078 68473 8739 100.0 1.195 !DANGEROUS LOAD-DO NOT USE!
+04.0 108 37.23 3288 2113 70745 8769 100.0 1.178 !DANGEROUS LOAD-DO NOT USE!
+05.0 110 37.59 3315 2148 73096 8799 100.0 1.162 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 104 35.80 3282 2104 74334 8308 100.0 1.161 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 35.80 3022 1784 50062 8966 98.7 1.361

 

[DrMike]

Cartridge : .22-250 Rem. (SAAMI)
Bullet : .224, 88, Hornady ELD-M 2283B
Useable Case Capaci: 38.868 grain H2O = 2.524 cm³
Cartridge O.A.L. L6: 2.620 inch = 66.55 mm
Barrel Length : 28.0 inch = 711.2 mm
Powder : Alliant Reloder-23 *C *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 99 34.83 2955 1706 43834 8633 100.0 1.424
-09.0 100 35.22 2986 1742 45405 8671 100.0 1.402
-08.0 102 35.60 3017 1778 47039 8709 100.0 1.380
-07.0 103 35.99 3047 1814 48735 8746 100.0 1.359
-06.0 104 36.38 3077 1850 50500 8782 100.0 1.338
-05.0 105 36.77 3107 1887 52335 8818 100.0 1.317
-04.0 106 37.15 3137 1923 54244 8853 100.0 1.297
-03.0 107 37.54 3167 1960 56229 8887 100.0 1.277 ! Near Maximum !
-02.0 108 37.93 3197 1997 58297 8920 100.0 1.258 ! Near Maximum !
-01.0 109 38.31 3226 2034 60449 8953 100.0 1.238 ! Near Maximum !
+00.0 110 38.70 3256 2071 62690 8984 100.0 1.220 ! Near Maximum !
+01.0 111 39.09 3285 2109 65027 9015 100.0 1.201 !DANGEROUS LOAD-DO NOT USE!
+02.0 113 39.47 3314 2146 67463 9045 100.0 1.183 !DANGEROUS LOAD-DO NOT USE!
+03.0 114 39.86 3343 2184 69996 9074 100.0 1.166 !DANGEROUS LOAD-DO NOT USE!
+04.0 115 40.25 3372 2222 72651 9102 100.0 1.148 !DANGEROUS LOAD-DO NOT USE!
+05.0 116 40.64 3401 2261 75411 9129 100.0 1.131 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 110 38.70 3363 2210 77495 8642 100.0 1.132 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 110 38.70 3089 1865 49680 9458 99.8 1.339

 

[SJB358]

Thanks Mike. I was just about to apologize since I haven’t gotten the updated QL with the 88.

looks like it works well though. 3200 with that 88 isn’t stuffing along at all.

frank, shoot a pic of your set up If you can. Sounds wicked.

 

[frankm]

Mike, thank you for QL projections! The IMR4831 is pretty close to what my actuals are. 35 grs which is mild pressure wise is running 3075 in my 27” Lilja 8 twt barrel. Adjusting 30 fps off the QL 28” barrel prediction is in that area. The case capacity is very similar to a 22-250 so makes sense. 2 of my partners are running R23 at 36 grs and getting 3100 fps in 27” barrel so their numbers not lining up as well to forecast. 37 grs of R23 has pushed them to 3175 fps range but it’s a pretty stiff load from what we can tell.

Picture of my rifle and a fired 22GT, loaded 22GT and a fired 22-250 for comparison. We really like this spunky little guy.

 

[SJB358]

That's pretty cool. I have been waiting a bit to build a fast 22 bolt gun, and that is another contender.

What are you using for dies Frank?

 

[frankm]

Scotty, just bought the 6GT set from Hornady. Using the F/L die only for shoulder bump and using a 223 Lee Collet die to neck size. Haven’t had to run through shoulder bump yet, 3 firings.

We shortened the 223 collet, I forget how much without checking drawing but believe it was either .100 or .125, and built a same dimension spacer that fits in top of die just below the cap. This allows the deprime/Mandrel rod to be in right position in die to neck size and deprime cases.

We liken it to a faster Dasher and feeds from Magazine better. It’s really a slightly different looking 22-250 with better shoulder angle and less taper.
Frank

 

[SJB358]

I saw the 6mm GT RCBS Matchmaster bushing dies and wondered if they would work for it as well?

That’s really a slick cartridge Frank. I can’t say how much I like a 22-250. Had an 8 twist but now I’m gearing up to do a 7. The 22 CM, 22-250 Ackley and GT have all kinds been in the running.

Thanks for bringing some info on it.