.308 load test

Me said:

If you're going to use a bushing die with out the expander button . You will need to turn your necks

Click to expand...

Walkalong said:

It depends on the quality of the brass,

Click to expand...

Agreed , If you are using quality brrass there should not be a problem . I don't remember what brass the OP said he's using but I've been having a problem with my Redding bushing dies and once fired LC brass . I have a detailed thread explaining this and I can't remember the title but I'f I find it I'll post a link .

I will show the issue a bit here .

The issue I've been having is the center part of the neck actually gets sized down more then the bushing size resulting in the necks having an hour glass shape



The picture looks worse then it is . The bell/flare at the top is .002 so a .004 belling when you ad both sides and only happens when the expander button is not used . This seems to only happen on LC once fired cases although I do have a good size lot of LC-12-LR cases the size perfectly with out the expander .

I found the thread over at The Firing Line , As you will see if you follow the link . Redding actually confirms there Dies have this problem through E-mails with me .
http://thefiringline.com/forums/showthread.php?t=567609&highlight=redding

different brass manufacturers will have different case volumes and this will have an affect on group size. the type of brass is also different between manufacturers. some will use 70/30 brass, some will use 75/25. it all makes a difference if you want consistently small groups.

murf

How do you get a consistent shoulder set back with the o-ring?

The "O" ring keeps constant tension on the threads of the die and press removing any slop that may be there . This forces the die to be pressed/pushed upwards as if the case was being pushed up into the die . This causes the die have consistent pressure on all the threads at all times resulting in consistently sized cases .

In the case of a seating die It can allow the die to not be locked down hard to the press . If your press thread and your die theads are not perfectly centered with each other . When you lock the die down . It could actually be locked down at a slight cant . If your seating die does not have full body suport , that cant can force the bullet in at the same cant increasing run out . The "O" ring allows the seating die to kinda free float in the threads and self enter yet stay secure and not loosen .

That's the theory's I've heard anyways . Not sure I'm buying it though . I'd like to see if the OP turns the die down another 1/3 of a turn then seat a few more bullets . I'd like to see if it seats the same as it did with a third less turn . My thinking is the O-ring pulls the die up keeping pressure on all the threads . maybe he got lucky and the die was centered at the first setting . If he turns the die 1/3 of a turn . If the threads are off that should put the die in a cant .

Lots of testing. That barrel may be shot out before you find nirvana.

Sweet shooting. Ditto Walkalong's comment.

Nice!