45 semi.

Choose a cast bullet that has the same profile as a commercial round that feed well.
The profile of the nose of the bullet will determine whether the cartridge has issues with the feed ramp as it is stripped from the magazine and pushed into the chamber by the slide.
When you are reloading take care to watch overall length of the cartridge. A bullet seated to far out, or too deeply will also give problems when feeding into the chamber.

An extreme example is the wad cutter bullet.

The other issue is to ensure that your bullet does not expand the case when you seat the bullet into the case.

BTW you are not going to be saving any money by using cast bullets, but you will get to shoot a great deal more for the same money.
 
Going down the road to casting your own bullets for you 45 will save you mucho money!

FMJ bullets 230/200 grain commercially sell for 14-16 cents each or C$140.00 a thousand. And remember, you only use it once.
Commercial cast bullets are now selling for C$100-110.00 or more for a thousand.
After you amortize your mold(s), casting pot, sizer, etc your only cost is lead and electricity.

For example, the 1st thousand 200 grain bullets you cast out of the fine LEE 6 cavity mold pays for the cost of the mold. Every subsequent thousand bullets cost you nothing.
 
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