Just ran a Q/L for the 300 Roy with the 180 Nosler AB bullet with 80 grs of H 4831SC. Now these are using the default settings that are in Q/L. They will certainly be different in your rifle Pressure for this load regardless of barrel length is 63314 psi
26" barrel---3126 ft/sec
24" barrel---3064 ft/sec
16" barrel---2718 ft/sec
Must say this surprised me but I know that big cases loose more vel per inch than smaller ones.
26" barrel---3126 ft/sec
24" barrel---3064 ft/sec
16" barrel---2718 ft/sec
Must say this surprised me but I know that big cases loose more vel per inch than smaller ones.