Ok guys, after a great deal of investigation here's where I stand. The RL23 seems to be to low in burn rate. The goal was to fill the case capacity to 100% with a burn rate that works for my 6mm Creedmoor. Here's what I have found and where I'm going with this at this point. Here's why I think that it's to slow. As I'm shooting the original problems where with fire cracking in the throat with H4350. I was only getting about 400 accurate rounds of barrel life. Moving forward I wanted to accomplish two things, 1) slower burning rate, bulkier powder that would fill the case for more efficient Extreme spread. 2) thought that the slower burn rate might also help with throat erosion and barrel life.
What it appears is happening is that it truly worked for Extreme spread, but it appears that its throwing unburned powder into the bore where it ignites. This is causing, excessive barrel heat, fire cracking spread out lightly over a larger area of the first few inches instead of extreme heat right on the lands. I like where this is going and what I've been finding however I now want to increase the burn rate in the case possibly taking away the extra heat generated in the barrel. Looking for a happy medium so to speak. The interesting thing when I look at the velocities, it's very good, high in fact. I spoke with the powder mfg, looking at this problem and spoke about RL26 which is an even slower burning powder. (This might explain the fps increase on the Rl26) the slower burning powder is burning slow enough that it's not clean also. The heat generated is farther down the barrel, so lots of carbon build up in the first few inches.
My focus is to stay the current coarse however speed up the burn rate. So here's my thoughts.
1) more seating pressure. .003 press instead of .002
2) start moving the bullet into the lands
3) possibly open the flash hole, any thoughts?
4) seat the CCI 450 primer farther forward towards the flash hole. This will be like adding spark advance and change the timing
If you have any thoughts on this topic , or experience please let me know. If you prefer, send me a private message.