Flutes on my cases?

[hoz53]

I have only had this experience twice out of a couple hundred chambers and I did pre-bore those. I think this is one of those things that catches up to everyone if you chamber enough barrels. There does not seem to be one single cause, 5R barrels, reamer geometry, barrel steel, etc. I used the wax paper and packing the flutes with wax methods and was able to save those chambers but is was a pain for sure. The only sign that something was amiss was a little squealing noise. No noticeable vibration.

Thanks for that info--- Ill pay attention and listen for the squeek - I think after this thread i have alot better idea why this is happening.

 

[hoz53]

You will see chatter in various frequencies, as it were. A squealing sound will indicate a high frequency chatter with the result being, lots of flutes but fairly shallow. The lowest frequency will produce six, very significant, flutes. You should feel this one. By the way, the flutes result from chatter will always appear in multiples of six. If the flutes are the result of reamer deflection in a five groove barrel, there should be five of them but sometimes, the deflection will set up the chatter which will result in the multiple of six. Sometimes, if the reamer starts to squeal, you can beat it by just increasing the feed rate but, if it doesn't quit right away, you had better stop and wrap or pack the reamer to settle it down. WH

ill listen for a squeal----- I think my first one did have 6 flutes. this one has more- dont know if i could even count them. Thats interesting , Im trying to visualize whats happening in the chamber and the reamer is turning making the flutes, but i think i understand this now. Thanks Much

 

[RussellJ]

View attachment 1205143 View attachment 1205144 View attachment 1205145 View attachment 1205146 View attachment 1205147 You can see the lines going the length of these cases. A person mite think they were fired in an HK fluted chamber, though HK fired brass i have seen is not like this, but no they were fired in a chamber i cut a while back. there are lines the length of the chamber like this to. Ive posted about this before - my question now is how can the lenthwise groves be cut in the chamber when the reamer only goes radially. or mabie they are somehow cut when i remove the reamer to clean chips and push it back in getting ready for the next pass. for what it is the rifle seems to shoot good. Thanks

I had the same thing with a 6x45mm rifle. I sent the FL Die and a couple of the cases to Redding for inspection. Redding claimed that their full length size die was fine and for some reason replaced it with a new FL die. Problem went away with the replacement die.

 

[gat]

Gonna sound crazy but a sharper reamer is apt to chatter more than a dull one. Wax paper always cured mine. Saved some in the last 20 or 30 thousandths of cut! Also seems like the straighter the cartridge walls the higher the chances!

 

[hoz53]

I had the same thing with a 6x45mm rifle. I sent the FL Die and a couple of the cases to Redding for inspection. Redding claimed that their full length size die was fine and for some reason replaced it with a new FL die. Problem went away with the replacement die.

this definately has marks in the chamber. Thanks

 

[hoz53]

Gonna sound crazy but a sharper reamer is apt to chatter more than a dull one. Wax paper always cured mine. Saved some in the last 20 or 30 thousandths of cut! Also seems like the straighter the cartridge walls the higher the chances!

that makes sense and this is a pretty new reamer. 3 chambers now. next time i use it ill be watching close and will use the wax paper if needed. Thanks