expander in redding FL dies leaving striations on inside neck

[rockwind1]

Well, I haven't nailed this problem down yet but here is what I do know. I recently started using Wilson inline seater dies and a 21st century arbor press and these necks that I just shared a picture of require a TON of seating pressure... Quite honestly, I don't think I would have even picked up on the problem had I not started using an arbor press to seat bullets.

So the question is what causes this?

I use a Forster FL die with an expander button. The die takes the neck down about 2 thou below the size of the expander so Im not having to strain to get the button back through the neck, but its a little more than what some people call "just kissing the neck." However, the expander button is the only thing that touches the inside of that neck so I definitely can't rule it out as the problem. Another thing that I'm questioning here is that I use SS pins, a touch of lemishine and two squirts of dishwashing soap to clean brass with prior to the sizing step. To me, the white colored streaks appear to be "soap scum" in my opinion but I'm not sure. I've sized a ton of brass both 284 and 260 this same way and have noticed this before, but havent really paid attention until I felt the seating pressure on my arbor press. Sometimes I notice it and sometimes it doesn't show up and my seating pressure is fine. I wish I could give you a definite answer, but I am still trying to find it out myself.

Well I think you can rule out the stainless steel media lemon shine into squirts because that’s exactly how I cleaned my once fired brass and I got those black streaks In both my brand new brass that I used a expander mandrel on and my one times brass that I cleaned myself and I used my expander ball on.
However, perhaps my brand new brass was cleaned that way by Hornady
I can definitely feel my expandable drag back up, I am not experienced enough to know whether it is just kissing it or not. I do know that my neck pushing is .289 And I think my expanding ball is going .290

What do you mean by white streaks they look like black streaks to me

I am using a Reading T7 press with a in-line fabrication handle and even though this is the first time doing this other than loading my 308 I haven’t noticed it being hard to seat bullet But I do have that huge handle

 

[rockwind1]

Well, I haven't nailed this problem down yet but here is what I do know. I recently started using Wilson inline seater dies and a 21st century arbor press and these necks that I just shared a picture of require a TON of seating pressure... Quite honestly, I don't think I would have even picked up on the problem had I not started using an arbor press to seat bullets.

So the question is what causes this?

I use a Forster FL die with an expander button. The die takes the neck down about 2 thou below the size of the expander so Im not having to strain to get the button back through the neck, but its a little more than what some people call "just kissing the neck." However, the expander button is the only thing that touches the inside of that neck so I definitely can't rule it out as the problem. Another thing that I'm questioning here is that I use SS pins, a touch of lemishine and two squirts of dishwashing soap to clean brass with prior to the sizing step. To me, the white colored streaks appear to be "soap scum" in my opinion but I'm not sure. I've sized a ton of brass both 284 and 260 this same way and have noticed this before, but havent really paid attention until I felt the seating pressure on my arbor press. Sometimes I notice it and sometimes it doesn't show up and my seating pressure is fine. I wish I could give you a definite answer, but I am still trying to find it out myself.

hey cowtown, i stole your picture and posted it on another gun forum and they said it is normal,,,well 2 poeple anyway

 

[ireload2]

Striations from galling are never normal.

hey cowtown, i stole your picture and posted it on another gun forum and they said it is normal,,,well 2 poeple anyway

 

[dkhunt14]

Striations from galling are never normal.

I see it in my WSM cases and I don't see it as grooves but just black streaks. It cleans out easily. I completely coat my necks and the bullets are not galling them. Matt

 

[avidflyer]

hi boyd, i am using a .289 bushing and the expander is pushing it back out to .290, i am feeling it pretty well when i am drawing the expander back up thru the neck, perhaps i should try a 290 bushing"

Learned last year whats printed on the bushing means nothing...i use a plug gauge to see where I’m really at....you’ll be shocked $4-5 each on amazon