Cartridge Length Increases

[gifbohane]

So I trim my 223 LC once fired cartridges to 1.750. Then I deburr and chamfer with my Wilson tool in a drill. Lo and behold all the carts now measure 1.752. Previously I deburred and chamfered by hand, not using the drill connector, and no change.

Any ideas on why?

 

[JFrank]

Interesting to say the least

 

[Blue68f100]

May be a burr left behind from trimming at a higher rpm. When using power tools you get a little vibration/wobble so you may have not gone fully to the stop.

 

[gifbohane]

Blue

That makes sense.. Just did 15 Frontier 5.56 and same result. Will try to go slower.

 

[JFrank]

Blue

That makes sense.. Just did 15 Frontier 5.56 and same result. Will try to go slower.

My Wilson trimmer if we are discussing the same tool is operated by hand rather then power, I haven’t noticed any growth although it’s I suppose possible.
on the other hand I rarely need to trim cases, perhaps once every 10 - 12 firings maybe more.
J

 

[gifbohane]

Prairie J

I trim the case length with the Wilson trimmer (a small lathe) using a Wilson attachment that enables me to use a small drill to power "the lathe.". This works perfectly in trimming to 1.750.
Then I bought a Wilson attachment that lets the Wilson torpedo slide into it. It then is powered by a small drill. This process (chamfering and deburring) is separate and away from the "lathe." Here is where the cartridge grows to 1.752.

I think that Blue is on to the reason, doing the deburring and chamfering to fast and free hand with the small drill.

 

[Walkalong]

Any ideas on why?

Over doing the deburring/chamferring. If you do it under power you can barely touch it for a split second.

 

[243winxb]

Case mouth is not square.

 

[mrawesome22-250]

Cheap, inconsistent digital calipers?

 

[berettaprofessor]

Got to be the calipers or the "measurer." Not possible to grow them cases by deburring and chamfering. Not likely to have a case mouth not square and measure every one of them first on the "short" side and then on the "long" side.

 

[gifbohane]

MRAWESOME- Nope on the calipers $200 Mitituyos and not knockoffs.

Beretta- Could be... but I measured over 50 of them, before and after, with the same noted and consistent observation.

I going with Walk's theory, that I BUTCHERED the case mouth with too much chamfer and deburring with the drill.

If that don't stop it I will go back to hand deburring. Gnarled fingers and all.

 

[FROGO207]

If the cutter is dull might be raising a lip when doing all three at once using power. Or out of adjustment. Just thinking out loud here.

 

[Walkalong]

If that don't stop it I will go back to hand deburring. Gnarled fingers and all.

lol, I know that feeling, just run the speed slow and barely touch them. I do .223 with my RCBS deburring tool chucked up in my little hobby lathe running slow and just barely touch them for a split second. Works well. Then I usually tumble them again for a short time.

 

[JFrank]

This whole thing is odd, .002 growth just from trimming, chamfer and deburring..

 

[gifbohane]

lol, I know that feeling, just run the speed slow and barely touch them. I do .223 with my RCBS deburring tool chucked up in my little hobby lathe running slow and just barely touch them for a split second. Works well. Then I usually tumble them again for a short time.

Roger that

 

[gifbohane]

This whole thing is odd, .002 growth just from trimming, chamfer and deburring..

Jim-- The carts are perfect 1.750 after trimming them on my Wilson bench trimmer..

The increase happens after with the deburring and chamfering tool.. this is a completely separate process with small drill and Wilson "torpedo" fastened into Wilson holder. This all started with my acquisition for Christmas of the holder that allows the trimmer to be inserted into the small drill. I do not think that the .002 means anything but that it just struck me as strange.

Here are the three parts I am describing-
https://www.midwayusa.com/product/1012788478?pid=315672


https://www.midwayusa.com/product/1012782275?pid=214923


https://www.midwayusa.com/product/1012810383?pid=789334

 

[JFrank]

Oh my apologies!
I’ve misunderstood your original post.
J

 

[gifbohane]

Oh my apologies!
I’ve misunderstood your original post.
J

Jim Absolutely no apology required. I appreciate all the comments and help.

 

[Varminterror]

Dull deburr and chamfer tools, or turning them backwards.

 

[gifbohane]

Dull deburr and chamfer tools, or turning them backwards.

Just to confirm - Both tool heads should rotate clockwise..??