Interesting, Protruding primers... though it is sort of too late.

[aulrich]

So the last little while I have been fire forming fresh brass for my k-hornet converted handi, I ran out so I though I would just de-cap and resize (with k-hornet dies) some of my once fired brass (from when it was a standard hornet)and see if I could get acceptable results out of the once fired. When I tried I could not get the brass into the shellholder. Turns out the primers were sticking out on most of them. 

There were no pressure signs the primers did not flatten.

Lockup good

Head space? Though I had the headspace guages in my hand I did not check (doh!) I am assuming the smith had checked it and would have told me it was bad.

Now maybe I had a rough chamber (did not flitz it figuring on the conversion) so maybe the case did not move all of the way back against the breach face leaving room for the pimer to pop out a bit. And since I had it convertedthere is no way to confirm that.

I don't know if this is a good sign but none of the fireform cases had a prodruding primer.

I am thinking I might polish the new chamber just as a percaution.

[Roger_Dailey]

Sounds like low pressure loads to me.  Sometimes the primer pushes back from its own force, then the case is pushed back from the chamber pressure.  Low pressure loads might not push the case back onto the primer.  Headspace problems?  Maybe, maybe not; I've seen some rim variance on Hornet brass.  Of course with the K, you can headspace on the shoulder. 

[aulrich]

I think head space is the least likely culprit, and if it is the cause like you said with the defined shoulder I can head space there. And the plan was to do the least amount of sizing possible, I have got the dies set to just kiss the shoulder basically trying to be as close to neck sizing as possible.

[stimpylu32]

Let me see if i got this right , you were going to deprime and size once fired , standard hornet brass with the k-hornet dies .

Then you found this problem . if this is the case you may have had a headspace problem with the hornet chamber but as it has been re-chambered to the K , this is a moot point .

Am i on track so far ?

stimpy

[aulrich]

Yea pretty much,

If it was bad headspace, I can replace the headspace on rim by setting the die so it head spaces on the shoulder, it's probably fixed.

If it was a rough chamber causing the case to stop short of the breach face, it's probably fixed.

This was with both Winchester and Hornady factory ammo though the Hornady seemed a little less affected low pressure ammo is unlikly.

I myself have never run into this before so I though it would be fun to bounce around some reason why it happened.

[Datil]

 To save the brass just a plastic hammer and tap primer back in, thence go ahead
  and deprime resize as usual, don't lose the brass, What caused it I don't know.
 Just my 2 cents. Marv.

[dw06]

So the last little while I have been fire forming fresh brass for my k-hornet converted handi, I ran out so I though I would just de-cap and resize (with k-hornet dies) some of my once fired brass (from when it was a standard hornet)and see if I could get acceptable results out of the once fired. When I tried I could not get the brass into the shellholder. Turns out the primers were sticking out on most of them. 

There were no pressure signs the primers did not flatten.

Since this is fired primers,I'd do what Datil said and tap primer back in so it will fit in shell holder.I've run into same thing in hormet playing around with reduced loads.
How does that k-hornet shoot for you?I had one of the ruger hornets converted to k,and it liked the 40gr ballistic tip real well.

[Paul5388]

Since the Hornet headspaces on the rim, that headspace amounts to the amount of gap from breech/barrel face to reciever.  In this case, there has to be too much barrel to receiver gap.  When the round is fired, the case grips the chamber wall keeping it from moving back to the receiver and reseating the primer.  When it was converted to K, it didn't have anything done to change that gap.  When you barely kiss the shoulder when resizing, you are taking up some of that barrel to receiver gap, which is fine unless you get so much the action can't close.

Marv's solution is fine for the once fired brass.

[Datil]

  And if the plastic hammer doesn't work, get flat punch and bigger hammer!  Marv.

[aulrich]

All but the worst ones I was able to get into my lee autoprime and reseat,I never. thought about just taping them back I could just set my woodworkers vise to catch the rim and give them a tap with a center punch.

On my to try list load wise are
40,50 Nosler bt's
50 Seirra blitz and blitzkings
45 and 50 remington bulk (just to check what the cheap stuff can do)

Powder wise lilgun is first but I do have some old w296 that could work as well.

My hope is that the 50's will work I only want one load for gophers and coyotes and the 50 carries a bit more punch downrange,but hopefully they expand enough on the gophers.