Re: ? about Mike Rock 5R barrels
What are you going to do with it?
Is it a LR hunting gun only or is it a 1k BR competition gun?
If it is a LR hunting gun, then will probably work as well as you want if not better. However, if a LR comp gun, then my suggestion would be to stay with proven comp barrel mftrs. Lilja, Hart, Spencer, K & P etc. You wait but it is worth the wait. My last spencer 2 months ago took 4 weeks for delivery. Liljas normally 4-6 weeks max. Lot of guys make big claims at times, look at results of their claims before you spend big dollars for something that might not be what you want. MR barrels might be very fine for this, but how do you know?
let someone else be the "guinea pig" with their money.
PS with that taper and length, if this is a gun you are going to use for comp, you are going to have a difficult time making either the 16.5 or 17 lb weight limit I think without fluting and staying with a 1" tube scope. Need to really talk to your gunsmith if that is a goal. If not, go for it.