I just ran out to the shop and made up a bullet like your's ...Well kinda

10 MM is fine for the deapth of the hole 12MM is kinda deap
but hay it's your bullet design .

Are the bullet's your making tapered or ?
i turned out a .510 ..( stock on hand ) and drilled a 12MM
and a 10 MM ..
My normal .510 jacketed bullet in a 525 grain has a hole in it of about 6 MM for deapth but then again there jacketed lead bullet's as of now i have not been able to make anymore
525 hollow point's becouse of lack of jacket's

Sound's to me like your Solids are going to be very well thought out and very efective bullet's

Pottsy

MartinPotts

Thanks for the advise.
I will properly stick to the copper for the expanding bullet and then develop a solid and use the tough brass.
I think that I will make the nose flatter if the bullet does not expand properly. Might also make the hole 2,0mm in diameter and 13mm deep.

Keep the input coming.

Cheers,

Andr�

Jeffery,
I agree with copper for the material, and the flatter nose as Martin suggests. Also, an 8 degree taper to a flat point makes for a fairly streamlined bullet. I have a set of dies to make up .416 bullets with an 8 degree taper and it looks efficient and you have room on the meplat to experiment with different cavity sizes to control expansion.

Tonight I will re-design the bullet 2,8mm hole and 12mm deep. We will also get a special copper mix that is tough but still soft. We might make the hole in the middle square to get a secure quadrant separation.
But we will try to se what a normal hole will do.
There is also the possibility of adding a relief to the inside of the hole. This can be done after drilling the hole.
The machine can also make a somewhat square hole with a special drilling tool.

I would like to thank Nickudu for some excellent advise on hole diameter and shape.

Cheers,

Andr�

BTT

Cheers,

Andr�