Factory Second Bullets 303 Caliber and 7.7mm Japanese

[Parashooter]

1. It looks odd because it's "Metford" rifling, featuring rounded grooves.
2. All those bullet brands normallly feature gilding metal (copper alloy) jackets with lead cores. Few of them expand on firing to fill the grooves - despite a lot of wishful posting on the web.
3. Best results can be expected from bullets with flat base and not more than ~.002" under measured groove diameter.
4. Boattail bullets offer less bearing surface than FB of same weight, making them a challenge in military chambers with generous throats. (They can yaw before engraving).