Might not be super helpful but I recently got a 358 win that I had cut down to 16". I loaded up 225 NPTs with both TAC and RL-10. Only shot the RL-10 so far but it gave me best grouping at just over 2400 (2408 fps average) out of my 16" barrel. Will see what it does with the TAC next week.
That is quite interesting actually. I have more work to do with mine. The data I collected suggested that for every .5 grain of TAC I was an average gain of 25 fps. I landed on the published load without any issues of 49 gr of TAC.
Since it was 22 degrees out yesterday I figured I was close enough at 2531 fps. I also had to sub CCI 250's for the Fed's. No biggie as the CCI tends to be more accurate anyways just not as hot. That Reloader 10 does seem to be a decent choice for the 358 no doubt
