throat size for a 6ppc sako 75 varmint

[dyno D]

hi, i am having megga trouble getting cases to fit my sako 75 varmint 6ppc usa. i am resizing lapua 220 russian cases with a 0.265" neck sizing bush but the cases will not fit into my bullet seating die due to the neck size being too large. i find that if i try an unsized case it seats well into the die but when i use a resized case i find it will not fit properly into the die.
if i force the case into the seating die i only go 2-3mm and this measures 0.261" while the rest of the neck measures 0.271". first - is my throat size going to be 0.261" and second - do i need to reduce the necks on the cases. third - do i need to slug the chamber to find the correct size.

any help will be greatly appreciated.

 

[stonecreek]

It sounds as if your seating die's neck is too small. The necks of brass fired in my Sako A-I 6mm PPC using Sako brass measure .270" after firing, and .2675" before firing. So, assuming your Sako 6mm USA PPC is chambered the same as mine, a seater die which requires a neck diameter of .261" or under is way too tight.

The Sako "USA" version of the PPC uses a somewhat thicker neck than the typical benchrest version, so I think you've got benchrest dies rather than PPC-USA dies.

 

[dyno D]

It sounds as if your seating die's neck is too small. The necks of brass fired in my Sako A-I 6mm PPC using Sako brass measure .270" after firing, and .2675" before firing. So, assuming your Sako 6mm USA PPC is chambered the same as mine, a seater die which requires a neck diameter of .261" or under is way too tight.

The Sako "USA" version of the PPC uses a somewhat thicker neck than the typical benchrest version, so I think you've got benchrest dies rather than PPC-USA dies.

thanks for the reply and i think you could be correct. i have just spoken to the person i bought the press/dies from and he says that he never used that bullet seating die. i will need to slug the breech and find out what the neck size is then have the die opened up to fit the case neck.

 

[stonecreek]

Instead of "slugging the breech", just put a caliper on a fired case. That is the dimension you're looking for.

 

[dyno D]

thanks stonecreek but as of yet i have been unable to make any bullets to fire in the rifle and here all the ranges seem to shut for the winter so it will be 2017 before i fire a shot.

 

[Webphut]

Can have reamed to a no turn 6mm ppc .274" neck, buy the 220 russian Lapua brass. Much easier reloading when there is not time and you just want to shoot. I am having mine done this way as I type this. Have 4 kids and no time to fine tune my reloads. I read alot about this and people are saying for varmint hunting, its plenty accurate at .274"

 

[dyno D]

Can have reamed to a no turn 6mm ppc .274" neck, buy the 220 russian Lapua brass. Much easier reloading when there is not time and you just want to shoot. I am having mine done this way as I type this. Have 4 kids and no time to fine tune my reloads. I read alot about this and people are saying for varmint hunting, its plenty accurate at .274"

thanks for your reply webphut but i have just bought a 21st century lathe so i will see how that works out first. if no joy then i might consider your option.

 

[Webphut]

I have that one. The mandrels don't seam as nice as the Sinclair mandrels but they work. Lube the lathe mandrel and also I found if I put case lube on the outside of necks before turning, they don't get as hot when I turn mine. I use RCBS case lube.