Powder coated bullet leading bbl

[Shuz]

Bullet is the NOE 260-118RF in plain base.
Powders are Smokes traffic purple and Smokes flat black.
Both covered very well, at least as well as the RCBS 25-120 that doesn't lead, but used a gas check.
Load is 12g of 2400 and WW large rifle primer for std or mag.
The NOE flat based bullet leads profusely, but the RCBS 25-120 gas checked does not.
Why?

[Shuz]

Surely somebody has a theory about what is going on here!��

[steve urquell]

Post up what size you are sizing your boolits to.

Also disassemble a loaded crimped round and measure your boolit to see if your crimp is swaging the boolit down in size

[gwpercle]

The gas check protects the boolit base ... Powder coating does not .

Anytime I load rifle boolits at over 900 fps ... a gas check is used .

The Gas Check can be your friend ... do not fear them , use them !
Gary

[Rapier]

I always slug every barrel, never guess, never use any GCs any more and load to 2,700 fps with no leading in rifles including ARs, and with .43" groups with the 358 RCBS 200. With the plain base at higher velocity, i double coat, base up, in a 1" deep hardware cloth box, upside down so the base is double coated.I use Eastwood Gloss Black chrome plate. Alloy is 70 ww-20 lino-10 mag shot, high temp to alloy., then water dropped out of the mould for a 20+ bh.
Shot this bullet in silhouette competition fr a few decades.
With a plain base, I found that the alloy should be hard, the coating should be baked then redcoated, baked, then sized to the exact groove diameter. I use a taper crimp die for best accuracy, to prevent resizing by scraping and I do not crimp bottle neck rifle bullets past straight, when expanding necks. Now if you load coated bullets you must expand the neck to retain the coating. Suggest you Seat and Crimp as two stages.

[Shuz]

I am sizing to. 2585 in a custom push thru Lee type sizer.
This size works well with my RCBS 25-120 that wears agas check. With this RCBS mould I get no leading.

[Wheelguns 1961]

It is possible that your brass is swaging your bases down in size (as Steve Urquell suggested). It is much harder to swage down a gas check. Pull the bullet on a loaded round and measure the base. This will cause leading.

[Smoke4320]

Since you have 2 bullets coated one with check and one without and only getting leading with the non checked bullet that kind of puts coating and gun issues to the back burner
I would also look at the non checked bullet for a sizing down when seating. Easly confirmed by pulling several seated bulled and confirming OD.
Please get back to us with info afterward (either way. what to get you fixed up)
Thanks

[almar]

It is possible that your brass is swaging your bases down in size (as Steve Urquell suggested). It is much harder to swage down a gas check. Pull the bullet on a loaded round and measure the base. This will cause leading.

I have personally experienced this problem and only found out when i measured a pulled bullet, couldn't figure out the problem i had with accuracy until i did that.

[Shuz]

It is possible that your brass is swaging your bases down in size (as Steve Urquell suggested). It is much harder to swage down a gas check. Pull the bullet on a loaded round and measure the base. This will cause leading.

I pulled a bullet and it measured .2567. Way too small! There in lies my problem.


I loaded some .261 bullets in cases that were fired but not sized and the leading was non-existent!
Thanks for the tips!

[Smoke4320]

Glad Its solved. happy hunting
.

[Wheelguns 1961]

Look into NOE expander inserts. They basically turn a Lee universal sizing die into an M-die type expander. There has been plenty written about them on here, so I will not go into it again, except to say that I use them religiously. Glad you figured it out.

[almar]

I made an expander AND annealed, problem solved.

[Shuz]

Will the NOE expander fit into the Lyman M die that I already have?

[Wheelguns 1961]

Will the NOE expander fit into the Lyman M die that I already have?

Are you already using an M-die, yet the bullets are being sized down? No, the Noe expander is designed to work with the Lee universal expanding die. I think the Lee dies are about $12. That is about what I paid for the last one.

[Shuz]

Yes, I am using the Lyman m die with a 25 cal plug and it evidently doesn't expand the neck enuff!

[Wheelguns 1961]

Yes, I am using the Lyman m die with a 25 cal plug and it evidently doesn't expand the neck enuff!

I used to use the Lyman m-dies until I measured my 45 colt m-die. It measured .448”. To me, it should have measured .450” or greater. That is why I switched.

[Shuz]

Is that the Lee part number 90798?

[Wheelguns 1961]

Is that the Lee part number 90798?

I believe that is the one.

[William Yanda]

Powder coat leading??? Heresy!

The other part of the equation is the weapon involved.

Tell us more.