Not 260 length! 6.5 length. Sorry. Both on my mind!
I know this topic has been on here over and over, but I was wondering if someone could lead me along the path to success!
I cut down a couple 308 cases to 260 length and ran them through my 6.5 new dimension dies just for curiosity. The result was a case that looked alot like my 6.5 CM cases. Overall length matched and side by side I could not tell a difference. I was really excited and loaded one to try and it just won't chamber. I think the shoulder is still a little high but thats a hard measurement to make! I am bottomed out on my die so I guess the next step is to buy another die and shave the bottom? Anybody have this particular problem? It is so close to chambering it makes me want to cry. I only ran two steps to get it here so I was hoping for cheap, easy 6.5 brass!
Not 260 length! 6.5 length. Sorry. Both on my mind!
Keep us posted. I havent tried.
How'd you cut the cases down?
Lee case length trimmer and a drill. I do everything the hard way! If I can move the shoulder back just a hair I believe I can do it.
You'll need a shorter shellholder. When I was playing around making 250 Imps from 243 brass I needed to use a .120" shellholder. I tweaked the FL die down a little at time until I got the amount of shoulder bump I needed.
You could also try putting a shim, maybe .002"-.003" between the floor of the holder and the casehead to allow the brass to enter the die a little further.
Bill
Each morning eat a live green toad, it will be the worst thing you'll have face all day.
My shell holder has a little play so I may try to shim my brass up a hair. Thats a good idea. I will try that today and see if I can gain enough to push my shoulder back.
Had the same problem making 300 savage out of 308 brass. When I sized down Rem. brass they chambered fine. When I used Federal brass they would not chamber. When I checked the outside dia. of each one the Federal brass was larger. The neck wall was thicker. Check neck thickness. Just a thought.
Arky 223
I checked that Arky 223. All of the measurements I have taken are within a couple thousanths. The inly thing I can figure is the shoulder height. It looks close but that doesnt count. I can almost shut the bilt but not quite. I aim to sharpie one and see if that is the case. It will show me the contact point so I can correct it.
Are you checking these with a bullet in them or just the bare case?
With the bullet.
Thanks. I see the problem now! What do I do about it, buy some more 6.5 brass?
If it's in fact a donut that's causing the problem then you have to neck turn (or ream but much prefer turning) to get rid of it. If using a bushing die with no expander ball you might be able to get away with not seating the bullet deep enough to push out the donut but that's more of a work-around than a fix.
Bookmarks