Lazouave, your minie's caliber, two grooves, base-cavity shape, and cavity depth seem to confirm it is one of the varieties of so-called "Prussian" minies... though the Thomas Brothers' research has confirmed those minies are not German-made, they are actually a US-made "pressed-&-turned" bullet.
An actual Lovell cavity is shaped somewhat differently than a "Prussian" minie's cavity, and is much deeper than .375-inch.
Regards,
Pete