270 Winchester. Brand of brass with highest/lowest case capacity???

Don't know about with 270, but the Winchester 308 brass usually has most volume, hence the Winchester brass very popular with the Palma shooters.
 
Don’t know about all the new manufacturers but Win brass has for years been a grain or grain and half more capacity than Rem brass.
 
So far along this quest i have found that Hornady has the highest case capacity by far. Today i am going to pick up a brand new bag of Winchester branded .270 if they are still there at the store.

I put 60 grains of H4831 into Starline, Federal and Hornady brass and lined them up.

The Hornady brass took the 130 grain bullet with no powder compression.

The Starline case was very compressed.

The Federal case was extremely compressed.

The lab radar clocked the Fed brass loaded round at 3150fps and the Hornady loaded round at 3000fps.

I found a single R-P case laying at the range the other day. When i get my new bag of WW brass i will line them all up again and post.
 
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