I am loading 6.5 Creedmoor with 130 grain Accubonds and for some reason I am crushing the shoulders of some of the brass while seating. I have crushed three out of 20. I am using new Lapua brass that have been chamfered and I have the seating die backed out a full rotation so as not to crimp while seating. Any ideas are appreciated.
Man, those look like triple venturi shoulders.đ
By having the die backed out a full turn with new cases, youâre probably not dealing with case length being too long or the die contacting the shoulder. My guess would be that the expander button is not opening the case mouth enough, especially since youâre seating a boattail bullet with a chamfered case mouth.
I just thought about it and if theyâre new cases, before the first loading try running the expander through the necks if you arenât already doing so. Donât resize them, just push the expander buttons through the necks.
Last edited by navlav8r; 10/08/23.
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There looks to be a pretty good ring on the bullets from the seater. It looks like way too much neck tension to me too. Why I don't know. Have you measured your necks pre and post sizing?
Are you SURE that the die is not contacting the neck? ie over crimping? If not the necks are too tight or maybe they missed annealing. Run them over the expander or use some lube. Let us know what you find.
Last edited by Blacktailer; 10/08/23.
I am continually astounded at how quickly people make up their minds on little evidence or none at all. Jack O'Connor
I am loading 6.5 Creedmoor with 130 grain Accubonds and for some reason I am crushing the shoulders of some of the brass while seating. I have crushed three out of 20. I am using new Lapua brass that have been chamfered and I have the seating die backed out a full rotation so as not to crimp while seating. Any ideas are appreciated.
Sorry if this too simplistic of an answer, but we dont know each other & you may be a new reloader.
Seating die is backed out a full rotation from where?
Touching the shellholder or touching the case neck with the ram at the top of the stroke?
The picture shows what look like chunks of bullet jacket rolled up just above the case neck. Crimping before full seating sure seems like a possible diagnosis. From here it could be a deburring thing too.
Do you have any measuring tools?
Sacred cows make good burgers when you know what temperature to cook them at.-Rev. Billy
Back the die way off, take a sized case and put it in the shell holder. Run the ram all the way up to the top of the up stroke, screw the die down untill you just feel it touch the case and then back it off 1/4 turn and lock the die ring now Adjust your seating stem now for your seat depth of the bullet. Measure a sized neck, now measure loaded round thats close to your nk tension, I run as much as .005 on some of my hunting rifles with absolutely no problem with consistent bullet seating.
I checked the adjustment of the seating die in the die ring (Forster Co-ax) by doing as suggested. I put a sized case in the jaws and lowered the handle, bringing the ram to the top of the stroke. There is ample clearance between the die and case which leads me to believe I am not crimping before seating. I am using is a Redding premium die set with a FL and seating die. I also took measurements of a FL sized case at the neck and compared to a loaded round that wasnât damaged in the seating process.
At this point I think there may be too much neck tension while Fl sizing. Could this issue be related to running a compressed load?
I recently ran into an issue with the shoulders expanding as I seated flat base bullets in once fired 308 brass necked to 7-08. The problem was neck tension. Which I cured by annealing all of the brass in a propane torch flame.
People who choose to brew up their own storms bitch loudest about the rain.
Bevel the case mouth very slightly using a neck expanding mandrel adjusted so it barely contacts the front edge of the case mouth. This assumes that all case are the same length.
You may need to lube the front edge as well. Use graphite.
Last edited by RinB; 10/08/23.
âPerfection is achieved not when there is nothing more to add, but when there is nothing left to take awayâ. Antoine de Saint-Exupery. Posted by Brad.
I checked the adjustment of the seating die in the die ring (Forster Co-ax) by doing as suggested. I put a sized case in the jaws and lowered the handle, bringing the ram to the top of the stroke. There is ample clearance between the die and case which leads me to believe I am not crimping before seating. I am using is a Redding premium die set with a FL and seating die. I also took measurements of a FL sized case at the neck and compared to a loaded round that wasnât damaged in the seating process.
At this point I think there may be too much neck tension while Fl sizing. Could this issue be related to running a compressed load?
I checked the adjustment of the seating die in the die ring (Forster Co-ax) by doing as suggested. I put a sized case in the jaws and lowered the handle, bringing the ram to the top of the stroke. There is ample clearance between the die and case which leads me to believe I am not crimping before seating. I am using is a Redding premium die set with a FL and seating die. I also took measurements of a FL sized case at the neck and compared to a loaded round that wasnât damaged in the seating process.
At this point I think there may be too much neck tension while Fl sizing. Could this issue be related to running a compressed load?
I had a set of new Redding die and was instantly having that problem. They had put the wrong expander ball in it. Called them and they sent the new one out. Cured. Edk