Seating Depth

abintx said:
I highly recommend reading this article from start to finish: http://www.6mmbr.com/catalog/item/1433308/977259.htm. This equipment ... and it sounds like you have some of it already ... will help you determine how far it is from the bottom of the case to the point where your bullet's ogive just touches the rifling. It's the easiest method I've found for finding my starting point. From my starting point, I proceed inward .005", .010" etc. Also, every time you measure with the O.A.L. tool, make sure the Modified Case is screwed on tight. It can tend to unscrew a bit as you remove the tool from your rifle's chamber. If the Modified Case is not fully seated on the O.A.L. Gauge, measurements will vary.

There are lots of methods that will tell you where you are ... for example a square or rectangle mark on the bullet ... that have been used very successfully, but I believe these tools will help you get started a little easier. The wooden dowel is really helpful in giving you a feel where the rifling is located. After you've mastered these steps, I believe jackie's suggestions on seating bullets will take you where you want to go. He's always helped me. Art
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abintx
I own both tools and have had great luck with both. The first thing I did when the rifle was done was fireform a case and send it off to be modified.
The stock 6BR modified case wouldn't fit my .265 tight neck. When it came back I tried it out but it didn't fit right. It felt kinda crunchy when it hit the chamber. I didn't persue it further.
Mark
 
This is what I have come to believe

Larry M said:
of what causes the variance in the point up is differing amounts of lube on the bullet.
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considering that for all practical purposes, liquids can not be compressed would seem to be the only thing that can make the ogive length longer. usually, custom bullets are quite consistent but there are those lots which have a goodly number that vary. I recently measured a box that had a .012 difference from one end of the lot spectrum to the other. It would appear that the lube used to make them was somewhat LUMPY.
 
alinwa said:
hmmmmmmm,
So in the point up process there's a flexion going on which changes bearing length and ogive taper.......interesting. :cool: al
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alinwa: This just in......

Winter storm and high wind advisory issued. Be cautious before heading down that road. Starting a trip at Assumption Junction with a bad map will only lead you to Nowheresville. Be prepared at all times. Avoid wildly spinning windmills. ;) :D

This has been a public service announcement. :) -AlinsnowySouthDakota
 
AlinSoDak,,

BTDT, got the Nowheresville T-shirt :D

I'll drive careful

AlinclearandsunnyWa



......... that scene in "Fargo" with the snow skirling over the blacktop, just prior to the Duck Stamp scene, I don't miss it a bit!! :D:D:D:D
 
base to bullet-bbl contact

has nothing to do with seating depth consistancy. This comes from one of the best bullet die makers out there.
Lube and good consistant jackets, along with a good point up die is where its at. Seat at bore dia and be done with it. The other alternative is to measure each loaded round from cartridge base to bullet-bbl contact and shoot the correct ones on the record, the others on the sighter. Been there and done that all last year. Did it work that way? Sure, just a PITA.
 
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alinwa said:
AlinSoDak,,......... that scene in "Fargo" with the snow skirling over the blacktop, just prior to the Duck Stamp scene, I don't miss it a bit!! :D:D:D:D
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"...and here 'ya are. And it's a beautiful day out. And all this over just a little money." Last scene in 'Fargo'. :D -Al
 
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