03-08-2023, 11:30 PM
The shoulder bump, for your chamber, is not getting set far enough back.
Best way is to measure it with a hornady head space comparator, using the right insert (I think it is B, the 0.350, but this is from memory), and your calipers. Compare this distance to datum point with Saami, but knowing what it is for your chamber so you can set it back a few 0.001's is the key thing.
Measure a few of your once-fired but unsized brass also, to see what the shoulder measures after it's been fired.
The resizing needs to set that back, oh, 3-6 thousandths depending on whom you talk to.
Then trim as needed, then see if they will chamber in your rifle without any bullet or powder or anything (they should), just the bare case. If it's an AR, guide the case in while pressing it into the boltface (to overcome the ejector), see if you can close the bolt all the way.
One more thing, this IS a saami grendel barrel, right? not some kind of 264lbc or knock-off... just making sure.
Best way is to measure it with a hornady head space comparator, using the right insert (I think it is B, the 0.350, but this is from memory), and your calipers. Compare this distance to datum point with Saami, but knowing what it is for your chamber so you can set it back a few 0.001's is the key thing.
Measure a few of your once-fired but unsized brass also, to see what the shoulder measures after it's been fired.
The resizing needs to set that back, oh, 3-6 thousandths depending on whom you talk to.
Then trim as needed, then see if they will chamber in your rifle without any bullet or powder or anything (they should), just the bare case. If it's an AR, guide the case in while pressing it into the boltface (to overcome the ejector), see if you can close the bolt all the way.
One more thing, this IS a saami grendel barrel, right? not some kind of 264lbc or knock-off... just making sure.
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