The young Black Caps paceman bowled a delivery at 153 kilometres an hour during the first Twenty20 international against the West Indies at Eden Park.
Milne feels he may have bowled faster at domestic cricket previously, but is unsure how much quicker he can get.
"That's the million dollar question isn't it?
"I dunno, hopefully, I'd love to get 160 but I'm not sure if that's in my realm."
Milne's only 21 and he says he's still maturing as a fast bowler.
"You get stronger in your mid twenties and I'm still a few years away from that so hopefully i can keep builing and keep getting stronger and more resilient to the bowling loads that i need to have."
Milne feels he may have bowled faster at domestic cricket previously, but is unsure how much quicker he can get.
"That's the million dollar question isn't it?
"I dunno, hopefully, I'd love to get 160 but I'm not sure if that's in my realm."
Milne's only 21 and he says he's still maturing as a fast bowler.
"You get stronger in your mid twenties and I'm still a few years away from that so hopefully i can keep builing and keep getting stronger and more resilient to the bowling loads that i need to have."