Owner of Buffalo Bore Tim Sundles on Heavy 44 Magnum Ammunition:
Item 4A (305gr. Hard Cast gas Checked LFN) is designed for super deep penetration on large game. The big flat nose keeps the bullet penetrating straight and thus deep. You can expect a good three + feet of penetration. The flat nose also does considerably more damage than a round nosed type of bullet as the flat nose cuts and smashes it way through living matter, while round nosed bullets tend to slip and slide through matter, doing much less damage along the bullet’s path and achieving more shallow penetration due to getting sideways while slipping and sliding through matter.
You’ll note my below velocities from over-the-counter revolvers and rifles.
Item 4A is recommended for all STEEL revolvers and rifles on today’s market. It is not suitable for scandium or aluminum alloy revolvers.