I recently acquired a tikka ctr in 260 rem. I had loads available from my savage predator 24" rifle in 260 Rem. using 140 amax, and 45 grains of 4831SC that shot well. Concern is, is a 20" barrel too short for 4831SC ? chronograph is trashed but guestimating that fps is 2600? is anyone shooting this load out of a 20"