Bumping the Shoulder with Full Length 223 Rem Sizing die
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- Опубліковано 8 лют 2025
- Short reloading video where I show you how to "bump the shoulder" of a bottleneck case.
** Apparently 5 - 0 = 4 in my universe??? **
This something you might do in an auto loader to try to limit how much you are working the brass, while continuing to have reliable feeding in the rifle.
Instead of squeezing the shoulder back into Saami spec, the shoulder is simply "bumped" a few thousandths from where it fireformed in the chamber.
A lot of people I respect say they like to set the bump about 0.004" or 4 thousandths, I tend to believe those guys. That number is sometimes "3-4 thousandths". Look into it yourself and see what your rifle likes.
As such, this should only be done for a single chamber, that is, you should not bump the shoulder of a case, then run the ammo in a totally different rifle, it may not be reliable.
Of course, experimenting is fine if you know what you're doing.
I hope you enjoyed this video, it was a lot of fun to make (since it worked!)
Great video, I have been looking into this and your video explains it really well
Thank you, glad it helped!
As soon as i saw the rusted ammo check gauges, i shut the video off. There was nothing more i needed to see here.
Thanks for stopping by!
That was just what I needed! Thanks.
You're welcome!
Good video, along with your others.
I was contemplating doing bump sizing, but am doing a large batch which will be shared amongst different semi autos.
Will do FL resize using SAAMI specs for feeding reliability.
Thank you, good luck!
Great vid!!
This one turned out really good, I was very happy I only had to do one take to get the results I wanted to show you guys :)
One can use a decapped pistol case also for a comparator.
Good point!
I had been doing that and didn't want to tell anyone for some reason lol.
Anneal cases on every 3rd reload and you won't "overwork" anything.
Good advice!
Great vid, I enjoy the longer vids keep it up!
Question if you don’t mind, do you have to run the bras thought a neck sizing die after you bump size?
You do not, in order to get to the shoulder the brass does end up going through the normal neck resizing operation.
Lee shell holder can be used also for measuring shoulder bump on 223
Liked your video, informative. What die are using ?
This is an RCBS full length sizing die.
Enjoyed your vid....but all that rust on your case gauges is surely throwing off your dimensions a bit....especially if your trying to plunk on the LE Wilson. Even a speck of dust, grime or lube on or in my Wilson’s will stop a case check in it’s tracks...
Thanks!
Yeah that 243 Win die is strange, it is the only one I have that is absolutely rusted, its been that way since I bought it, no idea why but it rusts like crazy!
shut it
@@shortreloadingvideos7571 spray some gun cleaning lube on your dies outsides... really cuts down on rust
You still didn’t explAin the difference between “bump” sizing and regular to sizing
This is a video about how to bump the shoulder. Not the difference between bumping the shoulder and fully moving the shoulder back to SAAMI spec, which is the difference.