.17-223

{{Short description|Rifle cartridge}}

{{Multiple issues|

{{more citations needed|date=January 2013}}

{{Notability|Product|date=February 2023}}

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{{Infobox firearm cartridge

| name = .17-223

| image = MicroExp.JPG | image_size = 300px

| caption = Left to right: .17/223 Norma Experimental, .17-223 Frankford Arsenal Experimental F A 7 2, .17-223 Frankford Arsenal Experimental F A 7 3, 4.3x45 D.A.G. Experimental DAG 4.3X45, 4.9x45 D.A.G. Experimental DAG .223, 4.7x45 Experimental DAG 4.7 MM, 4.85x49 Experimental XL1E1 RG 77 4.85

| origin = United States

| type = Rifle

| service =

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| is_SI_specs =

| parent = .223 Remington

| case_type = Rimless, bottleneck

| bullet = .172

| neck = .203

| shoulder = .358

| base = .376

| rim_dia = .378

| rim_thick =

| case_length = 1.76

| length = 2.15

| rifling =

| primer = Small rifle

| is_SI_ballistics =

| bw1 = 25

| btype1 = Hornady

| vel1 = 3929

| en1 = 875

| bw2 = 25

| btype2 = Hornady

| vel2 = 3940

| en2 = 862

| bw3 = 25

| btype3 = Hornady

| vel3 = 3989

| en3 = 883

| bw4 =

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| test_barrel_length = {{cvt|22|in}}

| balsrc = Ammo Guide [http://ammoguide.com/?catid=492 Ammoguide.com]

}}

The .17-223 / 4.4x45mm is a centerfire wildcat rifle cartridge. It is based on the .223 Remington, but the neck is re-sized to accept a .17 caliber bullet.