The barrel is a 27" Hart #5 (1:12) - Cryo Frozen. It gets fairly hot after only three shots, but that doesn't seem to affect the accuracy. I know this sounds a little wacky - I didn't believe it either at first - had to shoot it over another chronograph to confirm. Apparently, the NP3 coating does some things with friction inside the barrel that regular moly can only dream of. I did read some stuff later about this coating that suggested that it will cut your barrel life by about 1/3 - which in the case of the .30-378, would make it about 500 rounds . . . .