"adjust your die a tad down to maintain" How? remove material from shell holder or maybe the bottom of the die? I have three different presses, none of which have any means of positive stop that would allow for a repeatable stroke (short of contact between shell holder and die)?
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Neck interference fit
- Thread starter firearmsunlimit
- Start date
"adjust your die a tad down to maintain" How? remove material from shell holder or maybe the bottom of the die? I have three different presses, none of which have any means of positive stop that would allow for a repeatable stroke (short of contact between shell holder and die)?
How so???
If you believe the firing pin pushes the case to shoulder in the chamber then accurate should bump makes a difference.
You want the bullet as concentric as you can achieve as it strikes the
leade and engraves into the rifling.
Symmetry is good here.
The closer to perfect the better.
I neck turn cases for my varmint barrels.
They are ALL 'tight neck chambers' and use 0.0100 inch case neck wall thickness.
With around 0.0020 of clearance between the bullet and leade diameter.
A factory round will NOT fit, very much on purpose.
It makes for extremely tight groups to many hundreds of yard.
I use my 6 mm REAM AI out to around 400+ yards with excellent results.
Long ogive, tightly controlled leade clearance.
Case to chamber length within about 0.0010.
When neck hardness builds up over repeated sizing, I set them aside until I have
around to bother tempering them.
I then use them for fouling shots or sighting in shots a few times to get correct
hardness back on the neck.
That neck hardness affects the amount of force required by the powder to free the
bullet as it begins to break down on firing.
You can easily evaluate neck thickness variation to 0.0001" inch.
Just use a 0.0001" dial indicator in you neck measurement tool
instead of the more common 0.001" gauge.
Spin the shell on a snug pilot and watch the variation.
leade and engraves into the rifling.
Symmetry is good here.
The closer to perfect the better.
I neck turn cases for my varmint barrels.
They are ALL 'tight neck chambers' and use 0.0100 inch case neck wall thickness.
With around 0.0020 of clearance between the bullet and leade diameter.
A factory round will NOT fit, very much on purpose.
It makes for extremely tight groups to many hundreds of yard.
I use my 6 mm REAM AI out to around 400+ yards with excellent results.
Long ogive, tightly controlled leade clearance.
Case to chamber length within about 0.0010.
When neck hardness builds up over repeated sizing, I set them aside until I have
around to bother tempering them.
I then use them for fouling shots or sighting in shots a few times to get correct
hardness back on the neck.
That neck hardness affects the amount of force required by the powder to free the
bullet as it begins to break down on firing.
You can easily evaluate neck thickness variation to 0.0001" inch.
Just use a 0.0001" dial indicator in you neck measurement tool
instead of the more common 0.001" gauge.
Spin the shell on a snug pilot and watch the variation.