7mm Brass sizing

[norman_brown]

This morning I started resizing some brass for my 7 Mag. I screwed the die in to touch the shell holder then 1/8 of a turn as usual. The first few pieces that I sized had a lip/ridge where the shoulder meets the straight wall , is that common? I don't recall this ever happening with anything else that I have Reloaded..

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[DrMike]

Welcome aboard. I'm more than unclear about your question. Perhaps you could clarify somewhat. Usually ridging at the shoulder occurs during seating and not during sizing. Can't say that I'm familiar with an "anal lip." However, if there is a slight ridge at the shoulder, it would indicate that the brass is too long for your particular setup. It sounds as if this brass has been fired and you were resizing. When you set up your sizing die, verify through measuring the case length that the brass has not stretched in the chamber.

 

[norman_brown]

I corrected the post... I was using voice to text... it's during sizing

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[norman_brown]

Thanks for the welcome, I've been around for a few years but when I got my new phone I couldn't remember my password and couldn't retrieve it.

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[OU812]

What is the case length of the brass before resizing? I'm with Mike on thinking they are a tad long and the case is being pushed down causing the ridge/bulge.

 

[norman_brown]

Not where the neck meets the shoulder but where the shoulder meets the case wall

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[norman_brown]

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[OU812]

Not where the neck meets the shoulder but where the shoulder meets the case wall

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Can you post a picture? Are these new dies or have you used them before? You beat me to it. :lol:

 

[OU812]

That looks like an issue with the die, rough surface.

 

[OU812]

You might try backing the die out, place a dime on the shell holder and with the ram up screwing the die in til it touches the dime, this will resized the neck about 3/4 down. Lock it down and resize a piece and see if the mark is still there. If not I'm leaning to a die issue.

 

[norman_brown]

I tightened it down till it hit the ram but didn't add the 1/8turn like I usually do to bump the shoulder back and it's not there..

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[norman_brown]

The dies are about 2 yes old but haven't been used in at least a year, I probably haven't loaded 100 rounds with these dies

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[Tjay]

You were sizing them down too far causing a bulge at the shoulder. I would bet these cases will not chamber or chamber very hard. Back the die out and start short sizing a little at a time until you get a slight crush fit and then 1/8 or 1/4 turn more and you are good to go. This keeps the case from overstretching when shot prolonging case life.

 

[Darkhorse]

I'm with Tjay, I think you are oversizing. The problem is the factory states; touch the shellholder then turn in another 1/8 turn. While this is good basic advice for the average reloader it's not always the best.
I set my sizing die to just lightly touch the shell holder, then lock it down. Try to chamber that case in your rifle. If it won't chamber then turn in the die 1/8 turn and try again. Keep trying until all cases will chamber. All this depends on your chamber in your rifle.
A headspace gage can be invaluable as it gives numbers to refer back to.
If you go down with the die too much then the cases will stretch more when fired. Look for a ring just ahead of the belt. Bend a paper clip into an "L", make sure the short end fits through the case mouth, then file or sand a sharp point onto that short end. Insert that end into the case to the bottom then slowly pull it out with the sharp point contacting the inside of the case. Feel for a spot where the point hits a dip, it will likely also feel rough. That spot is a bulge where the case has thinned from stretching. Mark the spot with a finger on the paper clip, withdraw the clip and check where on the outside of the case the point touches. It most likely will fall right on or around that bright ring just above the belt.
I recommend discarding all such cases as case head separation is imminent.