09-29-2021, 11:54 AM
A 20" monster barrel should get about the same +MV from the hdy tables (120-150) as I'm getting, with both a faxon and a monster. Give or take.
As a single data point, the "data" on RE-17 is 1.42 ft/s per * so I did my own test, bringing a cooler packed with ice and did it in summer when temps were in 80's (I think)... anyway over the range 40-80 the MV loss that I saw was more like 1 ft/s per *, from my mgtospd data. That was with 6.5 CM in my rifle. So yeah, my feeling is the speed losses may not be exact altho similar in ratio or in magnitude-order...
My simple ballistics app says a 105 BTHP hornady would start transonic at about 900 yds when initial MV is ~2500... ~1240 at a grand. yours could be similar.
As a single data point, the "data" on RE-17 is 1.42 ft/s per * so I did my own test, bringing a cooler packed with ice and did it in summer when temps were in 80's (I think)... anyway over the range 40-80 the MV loss that I saw was more like 1 ft/s per *, from my mgtospd data. That was with 6.5 CM in my rifle. So yeah, my feeling is the speed losses may not be exact altho similar in ratio or in magnitude-order...
My simple ballistics app says a 105 BTHP hornady would start transonic at about 900 yds when initial MV is ~2500... ~1240 at a grand. yours could be similar.