brass prep..faster ?

[Alex Wheeler]

Trimming off the shoulder is more accurate IMO. The case indexes off the shoulder in the chamber. But I think everyone on this forum has consistent enough shoulder bump that it wont make a hill of beans.

 

[stool]

trimming off the shoulder is NOT more accurate. it can be AS accurate, but it all depends on how precise your case sizing is.
the spec for the case is not based off the shoulder it is based off the base, not the same as the chamber.
trimming to oal off the base is not hard and is correct...no matter where you left your shoulder.

for volume work i trim off the shoulder..but it is blasting ammo not br ammo.

my br guns get oal trim...just because it is how i do it, not because one is better than the other.
my cases are so precise in br that either method will work.

Trimming off the shoulder is more accurate IMO. The case indexes off the shoulder in the chamber. But I think everyone on this forum has consistent enough shoulder bump that it wont make a hill of beans.

 

[Alex Wheeler]

For discussion sake, say we bump a shoulder back .010" on a case and trim in off the base. When the firing pin pushes that case forward in the chamber until it stops at the shoulder will that case not have .010 more neck in the cahmber than the case that was not bump .010"? I think we should be seating bullets off the shoulder datum as well.

 

[Erik Cortina]

Go with the new RCBS combined neck trimmer and case prep center. At least that way you'll be indexing off the bottom of the case [vice the shoulder] when trimming. Faster for some things isn't necessarily better. If your prepping brass for later spraying the side of a barn it's OK, but if it's accuracy you're after, slowing things down gives a much better product.

This made me LOL.

Please tell us, what's wrong with a trimmer that indexes off the shoulder?

Call the Engineers at RCBS...

You mean the guys that designed this amazing piece of precision equipment?

 

[Alex Wheeler]

Go with the new RCBS combined neck trimmer and case prep center. At least that way you'll be indexing off the bottom of the case [vice the shoulder] when trimming. Faster for some things isn't necessarily better. If your prepping brass for later spraying the side of a barn it's OK, but if it's accuracy you're after, slowing things down gives a much better product.

This made me LOL.

Please tell us, what's wrong with a trimmer that indexes off the shoulder?

Call the Engineers at RCBS...

You mean the guys that design this amazing piece of precision equipment?

That was a good one.

 

[savagedasher]

So is there anyway to speed up brass prep? I need some ideas is the rcbs case prep center any good

I don't have the combo center but for $360.00 I don't think you can get any better. Not all cases have a shoulder but must be trim to length. Ever loading manual gives case overall length.
Larry

 

[stool]

the real question ..is why would you do something as stuipid as that....???

that is not a precision ammo crafter step....
atleast stick to real world conditions

most of your stuff is fine that was just childish...

For discussion sake, say we bump a shoulder back .010" on a case and trim in off the base. When the firing pin pushes that case forward in the chamber until it stops at the shoulder will that case not have .010 more neck in the cahmber than the case that was not bump .010"? I think we should be seating bullets off the shoulder datum as well.

 

[stool]

trim your case for your chamber, not to some spec.
size and bump for your rifle, not some spec...
now if you have precise case sizing either method should work......
base to end of neck is the most precise, shoulder to neck is only as good as your sizing/bump.

'dems is the mechanical FACTS not an opinion.

how and where you seat a bullet is an entire other subject......

 

[Alex Wheeler]

the real question ..is why would you do something as stuipid as that....???

that is not a precision ammo crafter step....
atleast stick to real world conditions

most of your stuff is fine that was just childish...

For discussion sake, say we bump a shoulder back .010" on a case and trim in off the base. When the firing pin pushes that case forward in the chamber until it stops at the shoulder will that case not have .010 more neck in the cahmber than the case that was not bump .010"? I think we should be seating bullets off the shoulder datum as well.

Precision steps or not, it does explain why I would prefer to work off the shoulder. Make it .001" difference in head space to be more realistic. If you seat and trim from the shoulder your headspace can be anything it wants and the amount of neck in the chamber and relationship of the bullet to lands will not change.

 

[Road_Clam]

If my brass is within .005" of trim length I will size/deprime and reprime in one operation. I'm at the beginning stages of shooting so +/- .005" on my case length is not going to make a difference in my groups, shooting more will. I also chuck up my casings in my bench top drill press and chamfer and give the necks a quick clean with a Scotchbrite pad. I've got a pretty good system going for a single stage setup. I kind of enjoy the prep work (well to a certain point).

 

[amlevin]

Size, decap and trim in one operation.......

Have to agree that this setup is pretty great. However, it doesn't expand the case necks or chamfer the case mouth. That still needs to be done in a separate operation.

I use the rapid trim solely for my .223 brass with a universal de-priming die in Station 1 and a Sinclair mandrel expander die in Station 5. I then use my "Rocket Ship" tool to chamfer and de-burr while sitting and watching TV at night.


As for processing brass in general, I use the RCBS Trimmer II with a carbide cutter equipped 3-way cutter head for trimming, chamfering, and de-burring sized cases. I have a series of bins that hold fired brass, sized brass, trimmed/chamfered/deburred brass, and one for cleaned brass ready to load.

I don't worry too much about the time involved in each process as I have several hundred pieces of brass for my .308 and thousands for my .223's constantly "In Process". When I have 15 minutes here or an hour or so then I merely work on whatever bin is starting to overflow and work the lot down to the "ready to load" bin(s). This way I don't have to schedule long sessions for brass prep, it's pretty much happening every day in what used to be called "spare time".

BTW, the more one "processes" brass, the more efficiently they do it. It's a matter of practice and experience. To me it was only a slow process when I was starting out (about 40 years ago)