30 Sherman Magnum 20” Build

CA48

Well-Known Member
Joined
Nov 18, 2009
Messages
1,201
Location
Texas
Thank You. I really have not got to test with the suppressor much. My HTA Chameleon supp can not handle the 20” Bbl. So I bought a TB ultra 5 and Ultra 338 (pictured) that are in jail at my ffl’s place. So if I want to shoot with them on I have to drive 5hrs to his location for now until my stamps come in. I have just shot a handful of groups at 100 yards with the ultra 5 and ultra 338. My rifle at 100 yards with the brake shoots .3-.5 3 shot groups usually the first 2 in the same hole then last shot opens up. I did notice with the suppressors on my groups were about the same size but the were in pretty symmetrical triangles vs 2 in one hole then one off to the side. Then again I don’t put to much thought into accuracy testing at 100 yards with bigger .30s or .338s with heavy for caliber bullets. A lot of the time they will shoot .5” a 100 yards then hold that .5” group to 200 yards as well.
 

CA48

Well-Known Member
Joined
Nov 18, 2009
Messages
1,201
Location
Texas
Thanks Rich, I would like to build another in the next year or so on a chey tac single shot action that way I can run a 1.450 shank for a heavy ELR setup. They do ELR shoots right down the road from me and I would like to get in on that myself. I’m thinking a Bartlein 400MODBB barrel with H-1000 would provide great accuracy and long barrel life.
 

slowshot18

Active Member
Joined
Jun 16, 2021
Messages
37
Location
Texas
Hey @CA48 have you loaded any 225 eldms with n570? I have a pile of both, no 215’s as they’ve been unibtanium. I was going to have carbonSix spin up a 20” in 300prc so I didn’t have to load for another rifle, but finding ammo the past few months has been challenging. Purchased some 300 prc brass and dies a month or so ago. Then I started reading more and more about Sherman’s, read this thread last night, called carbonSix this morning and my barrel was going to get chambered today. Told them to stop and do a 30SM. Super stoked about this barrel!
 
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