Re: 338 edge low velocity
I did quite a few of these in the 90's for elk hunters and never had one that slow. 95% of them shoot between 2750-2850 fps with the odd one at 2700 or 2900 fps. Re 25 was not one of the better powders we used with it but it does work well and better than what you are getting. H-1000 and Retumbo were overall probably the best powders in that cartridge that we tried on my range. The case is just not big enough to utilize super slow burners like H-870, etc. that we always got super results with in the bigger 338's. Without looking at it I don't know what is going on but you should get into the 2700's even with a slow one. Try some different powders and maybe you can find a load. All of my loads are with fed 215 match primers.
I can easily get over 2750 fps out of my standard over the counter rem 700 338 RUM with a 26" barrel. Did they cut your bore to tight and building up way to much pressure. Mic it and see what you have.
Predictions are difficult, especially when they involve the future