Cut a 700V and a 700 BDL SS to 21" - both had OEM 24" IIRC.
Chrony showed 2960 with 139/140s with Varget and 4064. Partial sized brass. Safe in MY guns.
HOW I hunted and rifle BALANCE would dictate choice. A longer sporter will yield more speed and less blast.
FWIW, same loads produced 2850 in a 20" M70 Carbine ...........I never felt handicapped. When you get to a longer distance, Shooting skill will change the outcome more than 100-200 fps.........IMHO.
Lastly, heavier bullets LOSE LESS MV than lighter bullets, as you go shorter on barrel length. To me the round melds well with the 140 AB and 150 BT. Others do fine also. The 21" above........gave 3050 with 120s if one is interested. Varget.
