I run all RL15 in my Whelen.
RP cases, 60 grains of RL15 with the 250 PT and CCI250's. Speeds run right at 2600 and accuracy is excellent.
Same load for the 225 AB but I use 61 grains of RL15 with all the same specs runs a touch over 2700, and is also very accurate for me.
While they won't all go into one hole like that, they won't usually push anymore than one inch.
This is all out of my M700 CDL.