Yes, you have to bush the firing pin hole or you will run into issue. Gre'-Tan Rifles is who you want to contact for the service as they have a quick turn-around and do great work.
I don't know what the numbers are comparing a remington pin to my savage pin but I've never had issues with my non bushed savage on my 6.5x47. Probably wouldn't hurt though.
I have been running a 6-47 for the last couple years and was going to bush it but decided against it. Yes it craters the primers but I have not had any issues what's so ever.
If I was going to go through the trouble of getting it bushed, just order a new bolt from PTG and have it installed from the start.