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You have already achieved the most important thing already - - Accuracy!! There are just too many variables to estimate velocity, you need a chronograph. I have seen two "identical" rifles (same make, model, barrel length, chambering) shoot the same handload with 50-75 fps average velocity difference.
A few factors which affect velocity (presuming same powder charge and primer):
Weapon - - - tightness of chamber & lockup, length of barrel, tightness & condition of bore, height & condition of lands
Case - - - thickness, capacity, alloy, trim length
Bullet - - - diameter, alloy of jacket, design of tip and base
Cartridge - - - fit in chamber, bullet distance from lands, crimp on bullet
All can and do influence the velocity.
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