Thread: So how much difference does the primer make?

So I stuffed up and primed some cases with Federal 210s instead of the CCI 200s I use in that calibre and have just finished load development with. I realised my mistake straight away, so started again from scratch for my developed load.
Being a Kiwi of Scottish descent I didn't want to waste 14 primers so loaded those cases up with a starting load to use as plinkers, barrel foulers etc.
Does anyone have any info on how much effect make of primer has on pressure or velocity?
I realise Federal primers are considered softer than most, so i wanted to play it safe. The load used is 2 grains lower than my developed load and 3 grains lower than I have tested with no pressure signs.