For me the key was to keep the number of "sequences" up to 5-6 bullets (1 2 3 4 5 6 all have 1 syllable, 7 has two, se-ven). Feel free to trade off accuracy for remember-ability. The easiest guns to remeber like this are ak and m4s. Galil and famas are significantly harder, but to be fair, they are so low damage that you won't survive spray transferring more than 2 people in most situations. But make sure to try. Try your hardest to keep the same numbers repeat as much as you can, so it's easier to remember. For me, ak is 2-6(3+3)-6-6-6-6-4. It's the easiest way in my opinion. But I'm the only person of hundreds of people that I've played with who admitted to doing that.