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In terms of Muzzle Velocity, things like BC and atmospheric conditions don’t really come into play. Those are more “down range” factors.
MV is more a combination of cartridge loading factors (powder, pressure, bullet diameter fit to barrel) and the length of barrel. There’s a perfect length barrel for all loadings, after which additional barrel length is a detriment to MV, however may be required for full stabilization of the bullet, dependent on twist rate.
Chronographs are reasonably inexpensive and provide verification of loading philosophies and sometimes unexpected results. It’s a good diagnostic tool to have available.
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