Case chamfer

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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.

Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
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Blackstuff
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Case chamfer

#1 Post by Blackstuff »

Hello all,

Its been quite a while since i've had to do any case prep so i'm a little rusty with certain elements so looking for opinions.

I use a Lee Quick Trim Power case trimmer that trims, chamfers and de-burs cases in one go. It could've been 4 years since I last used it. I have attached some pics of the results. Am I the only one that thinks the external chamfer on the case mouth is a bit excessive or would you be happy with it? They're .308Win cases.
DVC
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Blackstuff
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Re: Case chamfer

#2 Post by Blackstuff »

Hmm, pics don't seem to be uploading...
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ukrifleman
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Re: Case chamfer

#3 Post by ukrifleman »

Remember that the Quick Trim cutter is adjustable, make sure that it is set to its minimum, turn the knurled ring clockwise when viewed from the blade end until it stops.
According to the Lee instructions, this will trim to .006 below nominal case length.
Lee states you can trim the case shorter by turning the ring a click at a time anti-clockwise, which will remove approximately .001 per click up to a maximum of 10 clicks.
ukrifleman

https://www.reloading.co.uk/lee-quicktrim.html
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Mauserbill
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Re: Case chamfer

#4 Post by Mauserbill »

Hello
Like UKR says it is adjustable, I use them on all my military cases, and results are excellent, no more faffing about with the usual case prep tools.
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Re: Case chamfer

#5 Post by rox »

Blackstuff wrote: Tue May 09, 2023 9:03 amAm I the only one that thinks the external chamfer on the case mouth is a bit excessive or would you be happy with it?
Pictures shouldn't be necessary to answer this. For me, *any* outside chamfer is too much. Inside chamfer is sometimes applied, primarily to prevent bullet shaving. If trimming leaves a burr on the outside, then the outside should be deburred. Chamfering the outside is just weakening the case mouth for no good reason.

My trimmer cuts the mouth completely square and practically burr free. I don't touch the outside, aside from any effect that tumbling-off the lube might have. I usually apply a very light flare instead of chamfering, but with jacketed bullets and neck ID 0.001" to 0.002" under bullet diameter, I could happily load without chamfer or flare and still not see shaving.


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Blackstuff
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Re: Case chamfer

#6 Post by Blackstuff »

Thanks for the replies gents. I was aware that its adjustable, however whether its all the way one way or the other the result is the same.

Its so frustrating not being able to show the photos, but basically it seems dependent on how hard i press on the cutter as to how much chamfer goes on.

I am using the die in a Breech Lock Quick Change bushing, so I don't know if thats the problem? I would've thought that would have the opposite effect though. I'll give it a try out of there and see what happens.
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billgatese30
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Re: Case chamfer

#7 Post by billgatese30 »

I would have thought it will only take a thou or two of flex to make a big difference visually. Consistent pressure is likely to be a help. As said above, I only put enough inside chamfer to prevent shaving and as little as possible externally to keep as much brass in place as possible.
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phaedra1106
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Re: Case chamfer

#8 Post by phaedra1106 »

If you want to pop round and let me take a look at them just give me a shout.

I'm out tonight and tomorrow night but should be in Friday most of the day :good:
There's room for all Gods creatures, next to the mash and gravy :)
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Alpha1
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Re: Case chamfer

#9 Post by Alpha1 »

I dont think I have ever chamfered the outside of any cases in all the time I have been shooting. I am not sure I have ever chamfered the inside of a case either. Why would you want to thin the cases.
I use a L.E. Wilson trimmer that cuts the case mouths with no chamfer it just cuts them square I just run a deburing tool round the case mouths to get rid of any rags.
I have expanded case mouths to accept cast bullets but I normally use NOE expanders or a set of macined expanders I aquired from David/Christel.
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Graham M
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Re: Case chamfer

#10 Post by Graham M »

Yup just use a Lyman case trimmer when needed and then just run a Lyman deburring tool around inside and out to remove any burred edges.
https://www.reloading.co.uk/lyman-chamf ... -tool.html
Can't see the need to chamfer any of the brass.
Never argue with an idiot, he will drag you down to his level and beat you with experience.
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