Necking 6.5x284 into 284 win process.

[paulT]

for altering Lapua 6.5x284 brass into 284 win 7mm, could i use a 284 win redding comp neck size die with various bushings to reach 7mm size, ifso what bushing sizes would i need to neck brass to 7mm, thanks.

 

[RDavies]

To neck the case UP from 6.5 to 7mm, you will need an expander mandrel. You could either screw a 7mm expander into your 6.5x284 FLS die, or you could buy a 7mm expander mandrel and holder from Sinclair International. This will expand the neck UP to 7mm.
Once you expand the neck, seat a bullet and measure the neck size. Get a neck bushing .003" under the loaded neck measurement.

 

[paulT]

To neck the case UP from 6.5 to 7mm, you will need an expander mandrel. You could either screw a 7mm expander into your 6.5x284 FLS die, or you could buy a 7mm expander mandrel and holder from Sinclair International. This will expand the neck UP to 7mm.
Once you expand the neck, seat a bullet and measure the neck size. Get a neck bushing .003" under the loaded neck measurement.

Thanks for info.

 

[jbpmidas]

I use the Sinclair expander mandrel. It works very well!

 

[paulT]

I use the Sinclair expander mandrel. It works very well!

Would it be possible to use a redding comp 308 neck size die with correct bushing size to neck size the necked up 284 brass.

 

[RDavies]

No, the shoulder diameter is to small and shoulder angle to shallow on the 308 die

 

[paulT]

No, the shoulder diameter is to small and shoulder angle to shallow on the 308 die

Thanks, Gathering info with the 284 hoping to start build in few months to shoot f open in Ireland and hopefully one day make the National team.