Lehigh 41 caliber bullets

[gadabout]

Does anyone know if I could use a Lehigh bullet that is .409 caliber in a 10mm reload??
Craig 

edit to add these bullets weigh 150g

[The_Shadow]

That would be a little too tight as it is sized and spike pressures especially in a tighter bore like 0.3990" - 0.4000".
They also being a solid copper or bronze you not squeeze down in size easily like a lead alloy.  So resizing them is not easily either as they were turned on a lathe.

[gadabout]

Ah thanks Wade, I thought so and found data that said all 10mm and 40 cal etc. are .40.  I thought I might be pushing it.Thanks  Craig

[gadabout]

How about if I loaded one and did the drop in barrel test or I do have a size die(what ever it is called) would it be safe to shoot at a much reduced charge? Craig

[The_Shadow]

Craig if you use the sizing die put plenty lube inside and on the bullet, but it may still get stuck or difficult to push it through.
That being said these solid bullet are usually milled and the could have a bore sealing band slightly larger than the bullet diameter. 
Take some good measurements to see what you could be dealing with. 

[gadabout]

I said size die but I meant the die you buy separately to check the loaded round. Make sense?.   Craig

[The_Shadow]

You are referring to a cartridge case gauge.  I doubt it will pass that test.   The 41 cal bullet is 0.4100" and it does have the bands to fill the bore which would lessen the frictional forces in the 41 caliber barrel.  My main concern is that it will jack up pressures and possibly get stuck in the barrel or have kaboom.    It could actually split the barrel if it did fit the chamber and fired, like a wedge!  :'(
I have see where people have mad the mistake of firing a 300 Black Out in the 223 chamber and the bullet would stretch out as it tried to travel the bore and many wrecked their guns.

[gadabout]

I did suddenly realize that the chamber and barrel do not have the same dimension. so even if the case chambered the bullet may still be to big to exit or KABOOM as it were.  Craig