25 or 30 caliber for 100 yard shooting??

I have a FX Maverick in 25 caliber and it shoots pellets pretty good. In good weather is will shoot 100 yard MOA most of the time. Looking at getting a new Skout EPO and wondering will a 30 caliber give me better performance than a 25 caliber (shooting pellets). I do not shoot any competition or do hunting. Only do benchrest at 50 and 100 yards on my own range. I shoot almost every day and usually 100 shots or more. Don't want to go with slugs because of the extra expense.
Maverick.jpgrange.jpg100 yards.jpg
 
I have a FX Maverick in 25 caliber and it shoots pellets pretty good. In good weather is will shoot 100 yard MOA most of the time. Looking at getting a new Skout EPO and wondering will a 30 caliber give me better performance than a 25 caliber (shooting pellets). I do not shoot any competition or do hunting. Only do benchrest at 50 and 100 yards on my own range. I shoot almost every day and usually 100 shots or more. Don't want to go with slugs because of the extra expense.
View attachment 517890View attachment 517891View attachment 517892
I would look at the bc of some projectiles and calculate the stabilization factor for them at the twist rates you may be using for given projectile lengths. Large diameter or heavy isnt always the best way to go ime. The 25 king heavies might perform for you. The heavy for caliber pellets that are longer tend to behave like "iffy slugs". The 22 monsters have allowed me to get to 150 if there's no cross breeze. It took a long time but I now do the calculations on potential projectiles before I even get a gun. 25 is pretty magical in my experience. It just does well all around.