The entire premise of the uniformer is that it will bring perfection to the ignition process by ensuring that the primer torch is perfectly centered and goes straight into the powder charge with no deviation.
Work with me here for a minute. Unless it's a compressed charge, well, that ball of fire is going to be diverted to the air space above the powder charge, anyway, igniting from the top in a somewhat down and forward progression. I've frequently heard in the past that a cartridge is generally best settled with about a quarter inch or so of dead space below the shoulder,and many loads have even deeper voids. I've not heard with any consistency that compressed loads enhance accuracy.
Take that information for what it's worth, merely advice. But if those ideas regarding charge volume are true, the uniformer is just another step that sounds good, may help, but is probably totally useless.
But, what the heck. it takes so little time, it might help, do whatever you choose to do.