Case trimming lengths ?

[247sniper]

Hi guys,

just a quick question fellas,

I have shot all my .204 Ruger brass for its first time now and am going to prep the brass ready to be reloaded now that it is fire firmed.

What lenght should I trim the brass to, I have read on several places that you should trim to 1.840" and I have also read that you should also trim to 1.850" ?

What do you guys trim to. In the real world it probably won't make any difference but would like to go off real life experiences like you knowlagable people's

Whats your advise guys, I'm using hornady brass btw chaps

Many thank guys

Steve.

[Joe O]

I'v found that most chambers are longer than necessary and brass is shorter than necessary.I measure each chamber with the Sinclair gage ($7),and just square up
the case mouths (minimum cut).Cases that are much shorter than the norm, are set aside and used for fouler shots or other measurments.With the sharper shoulders (30-40deg)there is not much, if any, brass stretch.I check from time to time.I like custom chambers with .015 over trim length(most are longer).Using this procedure,I can ignore the "trim to length",as posted in the manuals.Hope this helps

[247sniper]

Cheers thanks Joe

Cheers mate.


Steve.

[Bill K]

Steve. I think you will find most chambers on the 204 are pretty standard (Now the throat or freebore is a different story) Max for case length should be 1.850 and they reccommend trimming to 1.840. This works the best for me, I know. And you will get many reloads before you have to trim again, unless you are really pushing the max on loads. Bill K

[Joe O]

Check out the SAMMI drawings of the case and the chamber,then measure a new piece of brass for OAL.
http://www.saami.org/PubResources/CC_Dr ... 0Ruger.pdf

[Bill K]

Check out the SAMMI drawings of the case and the chamber,then measure a new piece of brass for OAL.
http://www.saami.org/PubResources/CC_Dr ... 0Ruger.pdf

That is a good idea "Joe O" and if I read it correctly, it does show the case length to be 1.850 . The reload manuals then show to trim to 1.540 prior to reload. Very helpful info. Bill K Thanks for shareing.

[Zeus]

If it's not over the max case length of 1.850 there is no need to trim. Case trimming is the one step of reloading that I dread. If they aren't out of spec just leave them be.

[Bill K]

If it's not over the max case length of 1.850 there is no need to trim. Case trimming is the one step of reloading that I dread. If they aren't out of spec just leave them be.

In most cases I fully agree, Zeus. But I have one rifle that appearantly has a very tight or close to spec chamber. I start getting or showing some signs of pressure unless is trim cases, even new ones, back ever so slightly. So I have just started making it a general practice to trim a slight amount on all of them. For me anyway it just stops problems. Bill K

[247sniper]

If it's not over the max case length of 1.850 there is no need to trim. Case trimming is the one step of reloading that I dread. If they aren't out of spec just leave them be.

In most cases I fully agree, Zeus. But I have one rifle that appearantly has a very tight or close to spec chamber. I start getting or showing some signs of pressure unless is trim cases, even new ones, back ever so slightly. So I have just started making it a general practice to trim a slight amount on all of them. For me anyway it just stops problems. Bill K

Yes like Bill has said, I make it part if my reloading process to trim every time. Sometimes only a slither only Comes off and sometimes nothing at all.

It may take a bit longer and in the real world may not be nessecery But I feel happier knowing that they are all consistent and all the same.

Steve.

[247sniper]

If it's not over the max case length of 1.850 there is no need to trim. Case trimming is the one step of reloading that I dread. If they aren't out of spec just leave them be.

In most cases I fully agree, Zeus. But I have one rifle that appearantly has a very tight or close to spec chamber. I start getting or showing some signs of pressure unless is trim cases, even new ones, back ever so slightly. So I have just started making it a general practice to trim a slight amount on all of them. For me anyway it just stops problems. Bill K

Yes like Bill has said, I make it part if my reloading process to trim every time. Sometimes only a slither only Comes off and sometimes nothing at all.

It may take a bit longer and in the real world may not be nessecery But I feel happier knowing that they are all consistent and all the same.

Steve.

[247sniper]

If it's not over the max case length of 1.850 there is no need to trim. Case trimming is the one step of reloading that I dread. If they aren't out of spec just leave them be.

In most cases I fully agree, Zeus. But I have one rifle that appearantly has a very tight or close to spec chamber. I start getting or showing some signs of pressure unless is trim cases, even new ones, back ever so slightly. So I have just started making it a general practice to trim a slight amount on all of them. For me anyway it just stops problems. Bill K

Yes like Bill has said, I make it part if my reloading process to trim every time. Sometimes only a slither only Comes off and sometimes nothing at all.

It may take a bit longer and in the real world may not be nessecery But I feel happier knowing that they are all consistent and all the same.

Steve.

[tpcollins]

Check out the SAMMI drawings of the case and the chamber,then measure a new piece of brass for OAL.
http://www.saami.org/PubResources/CC_Dr ... 0Ruger.pdf

This spec says the cartridge length is 1.850" - .020. I know that 1.850" is the maximum so this would suggest 1.830" is the minimum. But I had been under the impression that a -.010" was the tolerance if not indicated - I learn something new every day . . .

[HoundofSC]

I trim after every firing to square case mouths and make sure they are all the same. I use a Wilson trimmer and just set it to minimum - 1.830. I don't think the .204 has enough recoil to set back a bullet in a case that has been properly sized.

[Joe O]

Check out the SAMMI drawings of the case and the chamber,then measure a new piece of brass for OAL.
http://www.saami.org/PubResources/CC_Dr ... 0Ruger.pdf

This spec says the cartridge length is 1.850" - .020. I know that 1.850" is the maximum so this would suggest 1.830" is the minimum. But I had been under the impression that a -.010" was the tolerance if not indicated - I learn something new every day . . .

That 1.850 is Max case length.Scroll down.....The minimum Sammi Chamber length is 1.8626.Your chamber may be longer,and I haven't found any brass (204r) that is as long as 1.850.That's why I don't trim,untill I know the chamber length,and usually only need to square the mouth,after the first fireing.

[247sniper]

Cheers again fellas,

All trimmed and ultrasoniced !


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Steve.