223 & 64 grain Sierra Gamechanger Quickload Please

[Aussie Wanderer]

Hi Guys, I have been running a load with 55 grain projectiles which have been very accurate for me. The little 223 is a cartridge I am looking to get to know a little better, it is such a fun little round. With the 64 grain sierra gamechangers, I suspect varget will work well, have H4350 but suspect won’t get enough of that in case. I also have 2206H, not sure what they call that in the States but works great with the 55’s. barrel length is 24 inches. Any help would be greatly appreciated. Also any experience with this projectile would be great too. Thanks

 

[gerry]

Have never even shot a 223 let alone loaded for one but it would appear that 2206H is H 4895 which should work well. Hopefully someone can confirm that or correct me if I'm wrong.

 

[DrMike]

I don't have the Gamechanger in my data base.

 

[Aussie Wanderer]

Thank you Mike

 

[jimbires]

I know Dr Mike keeps his quickload pretty well up to date , I checked mine just to see , I don't have game changers either .

 

[DrMike]

I can get you close by projecting with the 63 grain Semi-Spitzer (No. 1370) and the 65 graun SPBT (No. 1395).

Cartridge          : .223 Rem. (SAAMI)
Bullet             : .224, 65, Sierra SPBT 1395
Useable Case Capaci: 25.566 grain H2O = 1.660 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : ADI AR 2206

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   91    21.15   2667    1027   39604   5852     92.1    1.230
-09.0   92    21.39   2694    1048   40829   5921     92.6    1.213
-08.0   93    21.62   2722    1069   42091   5990     93.0    1.197
-07.0   94    21.86   2749    1091   43393   6057     93.5    1.180
-06.0   95    22.09   2777    1113   44737   6122     93.9    1.165
-05.0   96    22.33   2804    1135   46122   6187     94.4    1.149
-04.0   97    22.56   2832    1157   47551   6249     94.8    1.134  ! Near Maximum !
-03.0   98    22.80   2859    1180   49026   6310     95.2    1.119  ! Near Maximum !
-02.0   99    23.03   2887    1203   50547   6370     95.5    1.104  ! Near Maximum !
-01.0  100    23.27   2914    1225   52118   6428     95.9    1.089  ! Near Maximum !
+00.0  101    23.50   2941    1248   53739   6484     96.3    1.075  ! Near Maximum !
+01.0  102    23.74   2968    1272   55414   6538     96.6    1.061  !DANGEROUS LOAD-DO NOT USE!
+02.0  103    23.97   2996    1295   57143   6591     96.9    1.048  !DANGEROUS LOAD-DO NOT USE!
+03.0  104    24.21   3023    1319   58929   6642     97.2    1.034  !DANGEROUS LOAD-DO NOT USE!
+04.0  105    24.44   3050    1342   60774   6691     97.5    1.021  !DANGEROUS LOAD-DO NOT USE!
+05.0  106    24.68   3077    1366   62682   6738     97.8    1.008  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    101    23.50   3010    1308   58149   6519     98.2    1.039  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    101    23.50   2863    1183   49396   6385     93.5    1.116  ! Near Maximum !

Cartridge          : .223 Rem. (SAAMI)
Bullet             : .224, 63, Sierra SP SemiSp 1370
Useable Case Capaci: 26.270 grain H2O = 1.706 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : ADI AR 2206

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   90    21.60   2704    1023   39123   5952     91.7    1.218
-09.0   91    21.84   2732    1044   40329   6023     92.2    1.201
-08.0   92    22.08   2760    1065   41572   6094     92.7    1.185
-07.0   93    22.32   2788    1087   42853   6163     93.2    1.169
-06.0   94    22.56   2816    1109   44174   6231     93.6    1.153
-05.0   95    22.80   2843    1131   45537   6297     94.0    1.138
-04.0   96    23.04   2871    1153   46942   6362     94.5    1.123  ! Near Maximum !
-03.0   97    23.28   2899    1176   48392   6425     94.9    1.108  ! Near Maximum !
-02.0   98    23.52   2927    1198   49888   6486     95.3    1.093  ! Near Maximum !
-01.0   99    23.76   2955    1221   51431   6546     95.6    1.079  ! Near Maximum !
+00.0  100    24.00   2982    1244   53024   6605     96.0    1.065  ! Near Maximum !
+01.0  101    24.24   3010    1267   54669   6661     96.3    1.051  !DANGEROUS LOAD-DO NOT USE!
+02.0  102    24.48   3038    1291   56366   6716     96.7    1.037  !DANGEROUS LOAD-DO NOT USE!
+03.0  103    24.72   3065    1314   58120   6768     97.0    1.024  !DANGEROUS LOAD-DO NOT USE!
+04.0  104    24.96   3093    1338   59930   6819     97.3    1.011  !DANGEROUS LOAD-DO NOT USE!
+05.0  105    25.20   3120    1362   61802   6868     97.6    0.998  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    100    24.00   3053    1304   57369   6648     98.1    1.029  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    100    24.00   2902    1178   48745   6497     93.2    1.105  ! Near Maximum !

I suspect the difference in bearing surface will account for the differences noted, which tells me nothing concerning the Gamechanger.

 

[Aussie Wanderer]

Do you think varget would be better re the extra weight when compared to the 55’s?

 

[DrMike]

You will gain a little velocity at the expense of a bit more propellant. The amount burnt is roughly the same, so it is no more efficient. Case fill is slightly greater, which is not necessarily a good thing. I can't see that you are gaining enough to justify the switch. That is my take, which is worth roughly what I charged for it.

 

[Aussie Wanderer]

I have 500 of the projectiles so figure may as well work up a load for them. Will be fun learning a new load…hopefully.

 

[Firebird]

I don’t have gamechangers but I do run the 65 grain gameking out of my 223. My best powder with that particular bullet was H335 with cfe 223 a much slower second in accuracy. Maybe you can get your
Hands on some and give that a try. Sorry that isn’t exactly what you were after

 

[Aussie Wanderer]

Thanks Firebird, much appreciated. Do you know what sort of velocity you are achieving?

 

[Firebird]

3130 fps but I would love to go check that with my new Garmin chronograph. Sadly cold rain today. . . The rifle is a savage with a long, heavy barrel. My loads are built for accuracy first and velocity second