Flat or round seating plug for jacketed soft point 9mm?


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lateapex31
January 7, 2012, 11:40 AM
A friend gave me a massive box of these .355 115 grain plated or jacketed soft point bullets. They work well in all of my 9mm. My problem may be more cosmetic than anything, but I can't figure out which seating plug to use. The rounded plug smooshes the soft point of the bullett while the flat plug leaves a sharp burr around the jacketed portion of the bullet. They feed fine either way and seem to shoot the same. For what it's worth they are propelled by 4.1 grains of Bullseye using fed small rifle primers.

https://lh6.googleusercontent.com/-L6CS-_2Psok/Twhy_6vSTHI/AAAAAAAADBw/AW_mmLxzitM/s400/IMG_20120107_112847.jpg

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showmebob
January 7, 2012, 11:51 AM
I dont' know about the seating plug but I hope you meant to say Bullseye using fed small pistol primers

rcmodel
January 7, 2012, 12:00 PM
The rounded plug smooshes the soft point of the bullet while the flat plug leaves a sharp burr around the jacketed portion of the bullet.I think it is probably the other way around.
Flat plug smashes bullet.
RN plug leaves a bur.

Anywho, you have several options.
1. Live with it.

2. Send five sample bullets to the die manufacture and have them make or match a seating plug to your bullets.

3. Using a Dremel tool, chuck the seating stem in a drill and spin it while grinding & polishing the RN stems sharp edge off so it doesn't mark the bullet.

4. Mod your RN plug by putting a wad of JB-Weld in the stem, waxing a bullet, and running bullet up in the die until the JB-Weld cures. It will then be a perfect match to your bullets.

BTW: Yea, I'd use SP primers, not SR primers was I you.

rc

918v
January 7, 2012, 12:05 PM
Get a Redding competition seater. It has a conical seater plug, polished well, and does not mark bullets.

lateapex31
January 7, 2012, 05:25 PM
Thanks for the advice everyone. The bullet starts out with a flat point when new.

I am using small rifle primers, have been for a while and yes I worked my load up so don't copy my load without proper testing and knowing what works for your gun/powder/etc etc (end lawyer statement).

rcmodel
January 7, 2012, 05:28 PM
Oh!

Well then, probably the little dab of JB-Weld in the RN plug would work great.

You can dig it back out when you use up all those bullets.

rc

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