RE: T/C Firestorm & Roundball's Revisted
With any load in a 1-48 twist barrel, I always start them at 70 grains of 2f and then start pushing them up to see how fast I can push them before they fail to group. I am sure the 270 ballet would do real well on a deer.
If you have fat sights and want to shoot further, start trying to shoot a true 6 o'clock hold, where the POI is a dot on the center of the front sight top. Then you never cover your target and it might stretch your distance until you can get a peep.