Why is 204 ruger brass undersized
- Thread starter catbegone
- Start date
Originally Posted By: catbegoneWhy is all the new 204 ruger brass under sized.
You mean shoulder height or general diameter? It has to be smaller than SAAMI so it is assured of going into all chambers.
That's one reason why we don't work up loads with virgin bras as the case capacity can change dramatically from the unfired state.
Greg
You mean shoulder height or general diameter? It has to be smaller than SAAMI so it is assured of going into all chambers.
That's one reason why we don't work up loads with virgin bras as the case capacity can change dramatically from the unfired state.
Greg
Plant.One
Well-known member
SAAMI gives two specs for any caliber in their purview
maximum cartridge and minimum chamber.
minimum chamber is always going to be a bit smaller than max cartridge to ensure reliable chambering.
here's the specs
http://www.saami.org/pubresources/cc_drawings/Rifle/204%20ruger.pdf
so now the important question is - how much undersized are you experiencing and where based on the saami spec for max cartridge?
is the OAL the undersized part? is the shoulder at the wrong datum point? is the body diameter too small? is the neck diameter too small?
maximum cartridge and minimum chamber.
minimum chamber is always going to be a bit smaller than max cartridge to ensure reliable chambering.
here's the specs
http://www.saami.org/pubresources/cc_drawings/Rifle/204%20ruger.pdf
so now the important question is - how much undersized are you experiencing and where based on the saami spec for max cartridge?
is the OAL the undersized part? is the shoulder at the wrong datum point? is the body diameter too small? is the neck diameter too small?
catbegone
New member
I'm talking where the head of the case shows .378 but all mine are .373 down to .371
http://www.nosler.com/nosler-load-data/204-ruger/
http://www.nosler.com/nosler-load-data/204-ruger/
Same with my new Winchester brass it is 371 at the head and 368 in the body. Measuring the body on my fired 204 out of my AR it is showing 375. That 378 is pretty much MAX. My chamber is a bit tight on purpose. I have three other 204's in bolt guns that run right on 375-376.
Greg
Here is the SAAMI drawing:
http://www.saami.org/PubResources/CC_Drawings/Rifle/204%20Ruger.pdf
Greg
Here is the SAAMI drawing:
http://www.saami.org/PubResources/CC_Drawings/Rifle/204%20Ruger.pdf
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Originally Posted By: catbegoneWell the problem I'm having is the case falls off the bolt before its ejected. This is on a savage 12FV
Sounds like your extractor is not quite going far enough in. You might need to swap it out. I have had some on other calibers that just weren't enough purchase.
Greg
Sounds like your extractor is not quite going far enough in. You might need to swap it out. I have had some on other calibers that just weren't enough purchase.
Greg
