I used the same tool in a cordless drill and processed 1200 pcs of 223 brass couple years ago. I had a pile of shavings that you couldn't hold in the palm of your hand. No harm to the brass, lasted 10-12 firings with WARM loads for XTC.
Is it normal to get so much brass chips
- Thread starter Tozguy
- Start date
A comment in regards to neck thickness variations of Lapua cases.
When I first switched over to Lapua cases I used a pilot expander to round the necks out in case there were any deformities from shipping and ended up reading neck thickness variations in excess of what I had been expecting. Examining the case mouths showed that even though the cases had been chamfered at the factory, there was still some remaining wire burr on the inside of the neck here and there. A very slight chamfer with a sharpened chamfer tool removed that and the neck thickness variations dropped on average to under .001". Well, that and working on my measuring technique to minimize any variations I induced.
Good pictures of the sectioned cases. IMO (and you know what opinions are like) it's a bit too much chamfer countersunk into the case head. It should be safe if one doesn't run overly hot loads but in the future I'd figure a way to cut a little less deeply.
I've been experimenting with a deburing tool that has been customized a bit, the cutter has been reground a little so that the taper is almost gone, and doesn't leave the deep countersunk "funnel". Doesn't exactly work perfectly yet because it's tough to cut the big burrs from Winchester or Remington brass from the punching process, and deburring with power it tends to snatch the case. On Lapua brass it works pretty well by hand.
When I first switched over to Lapua cases I used a pilot expander to round the necks out in case there were any deformities from shipping and ended up reading neck thickness variations in excess of what I had been expecting. Examining the case mouths showed that even though the cases had been chamfered at the factory, there was still some remaining wire burr on the inside of the neck here and there. A very slight chamfer with a sharpened chamfer tool removed that and the neck thickness variations dropped on average to under .001". Well, that and working on my measuring technique to minimize any variations I induced.
Good pictures of the sectioned cases. IMO (and you know what opinions are like) it's a bit too much chamfer countersunk into the case head. It should be safe if one doesn't run overly hot loads but in the future I'd figure a way to cut a little less deeply.
I've been experimenting with a deburing tool that has been customized a bit, the cutter has been reground a little so that the taper is almost gone, and doesn't leave the deep countersunk "funnel". Doesn't exactly work perfectly yet because it's tough to cut the big burrs from Winchester or Remington brass from the punching process, and deburring with power it tends to snatch the case. On Lapua brass it works pretty well by hand.
Camac, My appeal to Sinclair’s support people didn’t turn up any useful information so far. Their first response was almost funny except for the thought that someone might actually do what was suggested. Essentially their answer implies that a 0.035’’ deep chamfer is normal for this tool. Note that I fired 5 cases that are chamfered like this (using 25gr. N140 behind a 69gr bullet) and with no problems. However, I do not plan to continue using this tool as is. Consensus here (me included) doesn’t seem to want that much chamfer.
Rust, I am also going to go the DIY route because it is not that complicated to regrind the Gen II cutter to reduce the chamfer.
Anyone who does not want that much chamfer is better off avoiding the Gen II tool. Anyone wanting to adjust the chamfer by indexing on the case mouth is better off with a tool designed for that approach. The cone shaped stop on the Gen II tool will not control depth of cut very precisely and you will likely end up with irregular chamfers and bell mouthed cases. Oddly enough, the person from Sinclair who answered my email said that he personally uses the Gen II tool this way (as opposed to following the instructions). He even goes so far to write that ‘The variation (in) depths of the chamfer of the flash hole due to variations in the case length do not really matter’.
He did say in his second message that he would find the instructions for the Gen II to see what it says.
It would be interesting to hear from anyone who uses the K&M deburring tool for comparison.
Rust, I am also going to go the DIY route because it is not that complicated to regrind the Gen II cutter to reduce the chamfer.
Anyone who does not want that much chamfer is better off avoiding the Gen II tool. Anyone wanting to adjust the chamfer by indexing on the case mouth is better off with a tool designed for that approach. The cone shaped stop on the Gen II tool will not control depth of cut very precisely and you will likely end up with irregular chamfers and bell mouthed cases. Oddly enough, the person from Sinclair who answered my email said that he personally uses the Gen II tool this way (as opposed to following the instructions). He even goes so far to write that ‘The variation (in) depths of the chamfer of the flash hole due to variations in the case length do not really matter’.
He did say in his second message that he would find the instructions for the Gen II to see what it says.
It would be interesting to hear from anyone who uses the K&M deburring tool for comparison.
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