22-243 MIDDLESTEAD
The following data was developed in a rifle build on the Hall BR action. The barrel was from Hart, stainless steel, # 6 and fluted. The chamber had a tight neck, of 0.246"
Federal 210M primers were used throughout our tests with the following loads. We also tried the Remington BR basic brass which came in 308 configuration and had a small primer pocket. We had to give up on that venture, as we had several rounds hang fire.
I think this is probably the largest 22-caliber case that can be used with currently available powders. We also tried a 6mm Remington necked down to 22-caliber, but were unable to get more velocity from it that this one. In fact, we found that to get roughly the same velocity – about 4000 fps – we had to use about 5.5 grains more of powder.
Looked at from a varminter’s point of view, this cartridge will give you about 100 fps more than the 220 Swift.
|
POWDER |
VELOCITY |
GROUPS |
BULLET |
|
46.0 RELOADER 15 |
4367 |
0.721 |
SPEER 40 |
|
44.0 |
4170 |
0.635 |
NOSLER 55 BT |
|
44.0 |
4207 |
0.229 |
BRAWAND 52 |
|
47.0 H 4350 |
4000 |
0.432 |
|
|
47.5 |
4016 |
0.698 |
2.630" |
|
47.5 |
4052 |
0.153 |
2.672" |
|
48.0 |
4006 |
0.696 |
2.630" |
|
48.8 |
4113 |
0.382 |
2.630" |
|
46.0 |
3824 |
0.647 |
|
The following loads were all with Winchester 243 brass and Federal 210M primers. All groups are 5 shots at 100 yards, and all bullets were molly coated.
|
POWDER |
VELOCITY |
GROUP |
BULLET |
|
|
|
|
|
|
45.0 VVN 540 |
4427 |
0.625 |
30 BERGER HP MEF |
|
47.0 |
4722 |
0.617 |
|
|
49.0 |
4985 |
0.333 |
|
|
50.0 |
5133 |
0.493 |
|
|
51.0 |
5203 |
0.927 |
|
|
50.0 VVN 550 |
4695 |
0.544 |
|
|
52.0 |
4971 |
0.605 |
|
|
50.0 VVN 560 |
3966 |
0.486 |
|
|
52.0 |
4199 |
0.387 |
|
|
45.0 VVN 135 |
4819 |
0.350 |
|
|
46.0 |
4968 |
0.363 |
|
|
47.0 |
5145 |
0.415 |
|
|
46.0 VARGET |
4540 |
0.502 |
|
|
48.0 |
4756 |
0.443 |
|
|
50.0 |
4968 |
0.391 |
|
|
51.0 |
5080 |
0.545 |
|
|
44.0 REL 15 |
4482 |
0.502 |
|
|
46.0 |
4732 |
0.388 |
|
|
47.0 |
4914 |
0.583 |
|
|
48.0 |
5029 |
0.531 |
|
|
49.0 |
5157 |
0.520 |
|
|
50.0 |
5278 |
0.554 |
|
|
POWDER |
VELOCITY |
GROUP |
BULLET |
|
46.0 VVN 140 |
4748 |
0.168 |
35 V-MAX HORNADY |
|
47.0 |
4864 |
0.221 |
|
|
48.0 |
4951 |
0.258 |
|
|
46.0 W 760 |
4038 |
0.270 |
|
|
47.0 |
4140 |
0.242 |
|
|
48.0 |
4324 |
0.134 |
|
|
49.0 |
4429 |
0.207 |
|
|
50.0 |
4566 |
0.759 |
|
|
51.0 |
4641 |
0.726 |
|
|
43.0 H 414 |
3755 |
0.470 |
55 FMJ SIERRA |
|
44.0 |
3815 |
0.681 |
|
|
45.0 |
3915 |
0.360 |
|
|
46.0 |
3991 |
0.594 |
|
|
47.0 |
4109 |
0.520 |
|
|
48.0 |
4145 |
0.586 |
|
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