I don’t think you’ll know without a chronograph. Each barrel is unique and each lot of ammunition is unique within certain tolerances. To me it is like taking two exact cars and putting them on a dino, some will be better than others. You put another brand of car on the dino with the same rated torque and horse power it’ll still be different.
If your wanting to shoot at very long range it’s best to have a base line velocity for a particular load so you can use a ballistic calculator to calculate your drop. Most times I can’t see my misses to get my own dope for extended long range. In the midwest there is so much foliage where I shoot the ballistic calculator helps me get on target. When shooting steel targets I can see the impact and hear the hit. If I miss I can rarely see dirt or brush move. I usually can’t see the bullet contrail good enough to make corrections to get back on target.
If your wanting to shoot at very long range it’s best to have a base line velocity for a particular load so you can use a ballistic calculator to calculate your drop. Most times I can’t see my misses to get my own dope for extended long range. In the midwest there is so much foliage where I shoot the ballistic calculator helps me get on target. When shooting steel targets I can see the impact and hear the hit. If I miss I can rarely see dirt or brush move. I usually can’t see the bullet contrail good enough to make corrections to get back on target.