I finally found it ...

I went to the range today - finally. Lovely 27 F (hey it is better than -10 F), sunny and hardly a puff of wind.

Using my Chrony F-1 for the first time. FCC .223 case, Hd'y 75 gr BTHP, 24.5 gr TAC, Fed Match primer, JP CTR02 with 22" hvy barrel getting 2836 fps avg velocity !!! Extreme spread of only 22 fps with 10 shots. Best 3-shot group 0.245" - Worst 3-shot group Just under 0.5". Sand bags front and rear.

Let's hope I can shoot like that in the ISSF 300m match tomorrow.

Just woke up and saw the replies. The chamber for CTR02 is "Wylde". I do not know much about it specifics, I know that it is meant to be a 223/556 hybrid.

The cases are once-fired from AE 223 55gr ammo which I had to ream out the crimp. I use the case gauge from JP to ensure proper fit to my chamber. The Max load according to the July 2013 WP on-line data is 25.8 gr of TAC. I arrived at the 24.5 gr (working up) by reading the loading recommendations on JP's web site. I have been reloading for about 5 years. I am certainly no expert or any where near it. But I followed the mfg recommendations.

ngnrd said:

That load data is for the higher pressure 5.56 NATO chamber, not the .223 Remington. But, the 223 Wylde that you have should be able to handle the much higher NATO pressures. That is, after all, why it was created. (Note that the Wylde chamber - as far as I can tell - is not SAAMI certified.)

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Thanks. And that is why this ammo does not get shot in my DPMS Prairie Panther. But I do shoot my 50 gr V-Max loads in the JP with great accuracy.