Using JB Weld To Create "Custom" 9mm RN Seating Stem Fit

otisrush · Nov 28, 2020

The recent post on 9mm RN and bullet marks was serendipitous. (https://www.thehighroad.org/index.php?threads/loading-9mm-round-nose.878772/#post-11722122)

I just discovered my 9mm RN bullet doesn't fit well with the RN stem I have. RCBS die set. Bayou Bullets 9mm 115gr RN. I chose this bullet because it has a pretty long/pointy nose. It loads well for the Walther PPQ I have (which has a short leade.)

So.....I'm contemplating using JB Weld in the stem as described in the above thread to create a better stem/bullet fit.

I'm a bit concerned about JB Weld spilling out from the stem and getting on the inside of the die body while the JBW is setting up. Do folks just put a very small dollop right in the center to ensure spillover doesn't happen? Or do people use other setups with the stem out of the die body while the JB Weld sets up?

Thanks!

OR

dredd · Nov 28, 2020

Lube / Wax the areas that you don't want the epoxy to stick.

AJC1 · Nov 28, 2020

Futnature wax or shoe wax both work well. Screw the seating stem in all the way so any mess is easily reached.

BigBlue 94 · Nov 28, 2020

White-out works well too. Coat the die and let it dry. This is popular with people making home-cast alloys and damascus

My experience with epoxies on ultra-smooth materials is that they dont stick. JB in particular hates ABS plastic.

Cokeman · Nov 28, 2020

Make sure the foil trick doesn’t work first. It’s non-permanent.

PO2Hammer · Nov 28, 2020

Make sure that first bullet that forms the cavity is well centered.

petrey10 · Nov 28, 2020

Anybody ever tried play dough ? Instead of foil

CQB45ACP · Nov 28, 2020

otisrush said:
The recent post on 9mm RN and bullet marks was serendipitous. (https://www.thehighroad.org/index.php?threads/loading-9mm-round-nose.878772/#post-11722122)

I just discovered my 9mm RN bullet doesn't fit well with the RN stem I have. RCBS die set. Bayou Bullets 9mm 115gr RN. I chose this bullet because it has a pretty long/pointy nose. It loads well for the Walther PPQ I have (which has a short leade.)

So.....I'm contemplating using JB Weld in the stem as described in the above thread to create a better stem/bullet fit.

I'm a bit concerned about JB Weld spilling out from the stem and getting on the inside of the die body while the JBW is setting up. Do folks just put a very small dollop right in the center to ensure spillover doesn't happen? Or do people use other setups with the stem out of the die body while the JB Weld sets up?

Thanks!

OR

I did a search...yours is the first use of serendipitous on this forum.

otisrush · Nov 28, 2020

Thanks for the ideas. Very helpful.

I read about the idea of putting a bullet on an overturned .223 case. At first I thought I'd put a bullet into a case with a belled mouth. But.....

I have a concentricity gauge. Maybe measure a bunch of loaded rounds and find one with little bullet runout?

PO2Hammer · Nov 28, 2020

Do you have a drill press?
Clamp a piece of wood on the drill table , drill a hole just large enough to hold a bullet. Glue a bullet in that hole, replace the drill bit with the seating stem in the chuck, place the epoxy putty on the stem and push it down on to the greased bullet.

Project355 · Nov 28, 2020

This isn't rocket science. Take the stem out of the die. Wrap the stem in a little bit of masking tape to make an extension of its outside diameter. Put the J-B weld in there. Push one of your bullets into the J-B weld. Make sure the bullet has been thoroughly waxed up with shoe polish. Let it dry. Unwrap the tape, remove the bullet, clean up your new stem with sandpaper or file, and stick it back in the die.

lordpaxman · Dec 1, 2020

It may not be rocket science but it would seem you’d want the bullet impression to be straight/square/on-axis with the seating stem. @PO2Hammer has one way that seems reasonable if you have a drill press or lathe. Checking run-out after the JB has dried seems reasonable as well.

loadedround · Dec 1, 2020

I've found that modeling clay works as a temporary fix to eliminate bullet marks when seating an odd shaped bullet. Best part it can be easily removed when finished.

Bfh_auto · Dec 1, 2020

otisrush said:
The recent post on 9mm RN and bullet marks was serendipitous. (https://www.thehighroad.org/index.php?threads/loading-9mm-round-nose.878772/#post-11722122)

I just discovered my 9mm RN bullet doesn't fit well with the RN stem I have. RCBS die set. Bayou Bullets 9mm 115gr RN. I chose this bullet because it has a pretty long/pointy nose. It loads well for the Walther PPQ I have (which has a short leade.)

So.....I'm contemplating using JB Weld in the stem as described in the above thread to create a better stem/bullet fit.

I'm a bit concerned about JB Weld spilling out from the stem and getting on the inside of the die body while the JBW is setting up. Do folks just put a very small dollop right in the center to ensure spillover doesn't happen? Or do people use other setups with the stem out of the die body while the JB Weld sets up?

Thanks!

OR

How did it work?

otisrush · Dec 2, 2020

Decided to try the aluminum foil ball method first - fast and non-permanent. It seems to have worked GREAT! I haven't actually loaded any rounds with it yet. But the fit is excellent and it was done very quickly.

Thanks for the ideas all.

OR

Using JB Weld To Create "Custom" 9mm RN Seating Stem Fit

otisrush

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CQB45ACP

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