Minimum Brass Trim Length
Hello Everybody, How much below book specs can you trim once fired rifle brass? The manual states 2.205" for .220 Swift. A buddy said to trim 10 thousanths under what the books say. My problem is half the brass i have accumulated is shorter than that already. What I can trim I've trimmed to 2.195", what can I do with the rest? I would like to keep everything equal. Thanks Robert
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General rule of thumb is that Trim-To is .010 below Max length, and that (spec) minimum is .010 below "trim-to" length.
That said, as long as your reasonably close to spec, load and go (with the swift you'll be needing to trim even the short ones in a couple more firings). Wait until a couple of them reach the "max length", than cut them all to somewhere between min and "trim to"0 -
Should I trim them all to 10 thousandths below the "trim to length", or just accept the accuracy they achieve until they grow? 0 -
I wouldn't worry about it. Without a measure of your particular chamber (like with a chamber cast) it is all theory anyhow- book specs may not quite apply to your rifle. For instance- I have an 8mm Mauser I made a chamber cast of. The neck is about .05" longer than spec would dictate. If you are trimming to spec, if a few are slightly shorter, I wouldn't worry; odds are you won't see any difference and it isn't dangerous anyhow. 0 -
The only REAL reason to trim brass is when it's to long for the chamber and it starts to pinch.
I open up the primer pocket hole and stick a bore scope into the case when it's chambered to check for true length.........
Sinclair sells a sintered lead plug you can use in a trimmed case to tell the actual length...
Anything else is just guessing what your chamber calls for......0
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