Chamfering and Deburring

blazin_saddles_lv · Jun 28, 2011

After shooting some reloaded Remington brass through my 300 win mag, I am having issues getting a nice smooth edge at the case mouth after using the RCBS hand held chamfer and deburr tool.

Shot once, I tumbled the brass in Cobb media, resized, then used the deburr and chamfer tool. The edge is still rough and slightly shaves the bullet when being seated. Am I not putting enough pressure or too much? Any help would be appreciated.

_rutN_ · Jun 29, 2011

Did u use a case length trimmer after u sized? Mine all come out perfectly smooth after the case length trim. Then deburr tool to round off inside rim allowing bullet to seat easier.

sjhgraysage · Jun 29, 2011

try spinning the case mouth on some 0000 steel wool, that will smooth up and soften any sharp edges basically a polishing of that chamfer.

ELKOHOLIC · Jun 30, 2011

LAST EDITED ON Jun-30-11 AT 03:31PM (MST)[p]I have had the same issue. I assume your using a drill to hold and spin the case? You almost have to just mess around with it till you get the hang of it. I start spinning the case with light pressure to start out and then use moderate pressure for just a second and then let off as the case is still spinning. You can tell if you mess up. It will have lines in it instead of just a smooth surface.

BuckSnort · Jun 30, 2011

http://www.midwayusa.com/viewProduct/default.aspx?productNumber=295771

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blazin_saddles_lv · Jul 1, 2011

I just bought a RCBS manual trimmer. It should be here next week.

Also, I just used the Hornady OAL guage to check the COAL. The Speer reloading manual says the max for a 300 Win Mag is 3.34" but touching the lands on my Sendero, puts the COAL at almost 3.44". Is that normal for a rifle to be that far off the max? The Nosler Accubonds reccomend seating the bullet .01 to .03 off the lands which still puts it over the max.

RELH · Jul 1, 2011

Are you sure the Speer manual states 3.34 is a "MAX" for the 300 Win. Mag, or is it a reccommended lenght as a overall guide. Your paticular rifle and bullet will be the judge of the COAL for best reliability and accuracy.

RELH

blazin_saddles_lv · Jul 1, 2011

I double checked. It does state "maximum COAL". I loaded a dummy round at the 3.44 length and it seems to cycle fine with no added strain on the bolt when loading. I think it is worth a try with a medium charge.