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Service grade ammunition issued with the service grade weapon.

A bullet of the type used in a Mannlicher-Carcano service rifle perhaps? A 6.5x52mm Mannlicher cartridge. Would you have difficulty understanding what I was talking about if I referred to an M16A2 bullet? It's the 5.56x45 cartridge. How about the AK-47 bullet? It is a 7.62x39 Soviet cartridge. Most service rifles shoot only one type of bullet. Especially when referring to the Kennedy "magic bullet" theory the bullet being referred to is a 6.5x52mm Mannlicher.

Thank you for the explanation

In the circles I travel a BULLET is almost always a component of the CARTRIDGE known as the PROJECTILE.

Hence a Mannlicher-Carcano BULLET would be a specific design-ogive, boattail, construction etc.

Reloading manuals generally refer to specific cartridges- 7mm Weatherby Magnum, 7mm Remington Magnum, 6.5 Carcano, even the 30 M1 Carbine with a variety of BULLET weights and designs offered

I would be very confused if someone referred to M16A2 BULLET since the A2 is a variant of the dreaded M16 which has been altered and modified endlessly over three decades in almost every aspect- barrel twist, bullet weight, bullet design, powder charge, mechanism design etc. and it remains a finicky, fiddly service weapon in harsh combat environments.

As to keyholing, again, in the circles I travel it is an indication of inherent inaccuracy for any number of reasons- bad BULLET design, cartridge/firearm incompatability,powder charge,barrel twist,weight etc.

Many thanks again for the explanation. Apparently through the miracle of the Internet it is now possible to visit sites with every variation of these discussions without repeating them.

It has been very educational.

Best regards