Custom projectile BTO difference

M

michaeljp65

New member
I purchased 1000 6mm custom projectiles well known US maker, they measured BTO .4050 give or take .0001 or 2. I just received a second lot of 1000 in 2x 500 box's. 1 box BTO is .3930ish and the 2nd box measures .3950ish. Living in Australia i have no say in what type of box's the exporter send me. I would have preferred a 1000 box but may be 2x500 is all he had. To be honest im a bit disappointed in the difference in BTO measurements, is it normal for there to be such a difference? I guess i just have to seat these ones out a bit further and hope the tune doesn't change much.
 
I wouldn't give this a second thought. Would not mix them together but that's about it.

Let us know how they shoot - box to box.

And....you do have a say!
 
Wilbur said:
I wouldn't give this a second thought. Would not mix them together but that's about it.

Let us know how they shoot - box to box.

And....you do have a say!
Click to expand...

I suppose i do have a say Wilbur, thats just a silly comment on my behalf, next time i'll ask for a 1000 count box's only.
 
Presuming the same point-die, to expand upon George's and Wilbur's take, and NOT altering the seater-stem: the only thing that will change, with varying B-O, is that the bullet base will go into, or out of, the case neck roughly the thickness of a business card. The "seating-depth", or, relationship of the ogive to the lands will not change - again, presuming the same point die. Just load 'em and shoot!:eek:RG
 
Reply from bill b

1. There is a difference in core seating pressure -- or --
2. there is a difference in the material in the jacket will change that or change ojive measurement

Bill
 
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