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MadPick wrote:
Best option: Get a Giraud power trimmer that does it all at once. :thumbsup2:

Wife bought me a Giraud for Christmas two years ago. It does great on my 6.5 Creedmoor cases, but its been struggling to put an even chamfer on .300 BLK cases I've been converting. Haven't been able to toy with it much the last year, but hopefully this winter I'll decode the issue.


Sun Oct 01, 2017 6:46 pm
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Olympia173 wrote:
MadPick wrote:
Best option: Get a Giraud power trimmer that does it all at once. :thumbsup2:

Wife bought me a Giraud for Christmas two years ago. It does great on my 6.5 Creedmoor cases, but its been struggling to put an even chamfer on .300 BLK cases I've been converting. Haven't been able to toy with it much the last year, but hopefully this winter I'll decode the issue.


What headstamps are you converting?

I tried some NPA and the wall thickness is a little thick.


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Sun Oct 01, 2017 7:30 pm
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Olympia173 wrote:
MadPick wrote:
Best option: Get a Giraud power trimmer that does it all at once. :thumbsup2:

Wife bought me a Giraud for Christmas two years ago. It does great on my 6.5 Creedmoor cases, but its been struggling to put an even chamfer on .300 BLK cases I've been converting. Haven't been able to toy with it much the last year, but hopefully this winter I'll decode the issue.


A couple of thoughts:

- Do you mean that the chamfer (the cut on the inside of the case) is too big or too small? If so, adjust the cutting blade in or out.
- Do you mean that the chamfer is bigger on one half of the case than on the other? If so, give the case a partial turn with your hand when trimming is almost complete. I usually push downward until trimming is "done," then give it a twist and remove it.

P.S. Your wife is a keeper! :inlove:

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Sun Oct 01, 2017 7:41 pm
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RocketScott wrote:
What headstamps are you converting?


Almost exclusively Lake City with some PMC thrown in here and there.

MadPick wrote:
A couple of thoughts:

- Do you mean that the chamfer (the cut on the inside of the case) is too big or too small? If so, adjust the cutting blade in or out.
- Do you mean that the chamfer is bigger on one half of the case than on the other? If so, give the case a partial turn with your hand when trimming is almost complete. I usually push downward until trimming is "done," then give it a twist and remove it.

The second one. I'm getting a larger chamfer on one half than the other. I'm sure some of this depends on how long (or short) the case was trimmed on my mini chop-saw. I did the twist and while it does seem to help in most instances, I feel like its strange that the cutting head, rotating 360 degrees around the case mouth at several hundred RPMs, doesn't apply an even cut around the entire circumference. I guess I just feel that for the price of the trimmer, I shouldn't have to do the work of twisting it with my fingers (which does get tiring).


Wed Oct 04, 2017 9:47 am
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I think the issue is that the case is not PERFECTLY aligned with the spinning cutter. Maybe the case holder isn't aligned with the cutter (trimmer manufacturing problem), or maybe you're not pushing the cases straight down. (I'm honestly not sure if it's even possible to push them down anything but straight, just speculating.)

Trimmers that don't chamfer/deburr don't have this problem, because the case can sit anywhere on the large cutter blade.

I know that the chamfers on my cases aren't always perfectly even, but they're close enough and I don't worry too much about it.

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Wed Oct 04, 2017 7:00 pm
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