Sept 23'rd 2015 chrono testing

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Sept 23'rd 2015 chrono testing 20 inch SS Wylde barrel

Lake City brass trimmed to 1.750 COL 2.250 84 deg. bright sun

55 gr. fmj 25.2 AR-Comp 3226, 3250, 3237, 3248, 3234 fps
55 gr. fmj 25.6 AR-Comp 3192,3188, 3176, 3191, 3183, 3194 fps
55 gr. fmj 25.9 AR-Comp 3202, 3206, 3205,3197, 3191 fps
55 gr. fmj 26.6 AR-Comp 3304, 3306, 3308, 3299,3296 fps

62 gr. fmj 24.3 AR-Comp 3036, 3038, 3029, 3034, 3041 fps
62 gr. fmj 25.0 AR-Comp 3086, 3072, 3078, 3080, 3084 fps
62 gr. fmj 27.0 CFE 2956, 2958, 2960, 2964. 2966 fps
62 gr. fmj 27.4 CFE 3016, 3017, 3020, 3023, 3025 fps @ max hot w
62 gr. fmj 26.5 W748 2925, 2959, 2950, 2964, 2968 fps
62 gr. fmj 27.0 W748 3032, 3041, 3036, 3039, 3044 fps
62 gr. fmj 27.2 LRV 3129, 3134, 3137, 3131, 3138 fps @ max hot w
62 gr. fmj 27.5 LRV 3164, 3188, 3172, 3168, 3171 fps
62 gr. fmj 28.0 H414 2921, 2934, 2926, 2931, 2933, 2928 fps
62 gr. fmj 28.5 H414 3027, 3033, 3018, 3021, 3014, 3024 fps
62 gr. fmj 29.0 H414 3154, 3166, 3161, 3158, 3162, 3157 fps Max

75 gr. Match 24.8 Varget 2752, 2774, 2773, 2782, 2766, 2768, 2748, 2772, 2748, 2765 used up last Varget powder
75 gr Match 27.6 H414 2788, 2802, 2797, 2799, 2789, 2794 good round

24 inch match barrel 223

55gr sp AR-Comp 25.3 gr 3270, 3281, 3247,3253, 3249,3268, 3279 fps
55gr sp AR-comp 25.9 gr. 3338, 3340, 3325, 3334, 3328, 3336 , 3339 fps max load
55 gr fmj W748 27.6 gr. 3285, 3289, 3296, 3290, 3291, 3294, 3295 fps
55 gr sp CFE 28.0 gr 3162, 3168, 3164, 3167, 3169, 3165, 3168, fps
62 gr FMJ AR-Comp 24.1 gr 3102, 3107, 3099, 3098, 3104, 3106 fps Should load to 24.5
62 gr FMJ H414 28.6 gr 3096, 3098, 3107,3120, 3108, 3103, 3105 very accurate

18 inch barrel wylde 223

55 gr. sp AR-Comp 25.6 gr 3155, 3162, 3166, 3158, 3161, 3159, 3157 fps Really good round

 

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Just a note. I also own two 20 inch 5.56 and I can testify as to pressure differences because of the chamber size between 5.56 and smaller tight .233.

5.56 can use more powder and get higher velocity, but I never got the accuracy until I started buying high quality stainless barrels like my 24 inch Shilen match grade.

So I put ar-15's in two classes the close in defense with dot type non magnified optics. All built on you sub $1200 off the shelf mill spec barreled 11, 14.5, 16, maybe 20 inch. Then you have the other group who actually use AR's for competition, paper punching, and hunting.

From my chrono testing 16 inch is about 200 fps slower than 20 inch barrels and as much as 400 feet slower than full 24 inch.

I've also gotten away from threaded end barrels. because a 16 inch with a brake or flash hider is actually close to 18 inches. So why not just buy a 18 or 20 inch crowned barrel?