If..! you use a 600 grain Duo Diameter bullet in your single shot rifle part of the bullet lays inside the riflings giving you room in the case for powder.you seat the bullet farther forword.

Soo a 600 grain bullet fired from a single shot 45/70 should give you atleast 1400FPS and a 650 should be around 1320 FPS making a 700 grain bullet in a duo diameter/bore rider come out at about 1100 fps ... while these speeds are on the ( D a r n slow side ) just think of the fun you will have showing off your odd looking loaded rounds to your friends.

And while these also might be slow thay make a heck of a dent in hogs at close range.

And if nothing else you can use them as a pencil to write with there long enough

So what will it be a box of 50 or a box of 1000 lol

A fun bullet in a single shot is a duo diameter spitzed boattial.

Duo Diameter pictured below are 50 cal / .510 diameter