Good evening Racingsnake,Originally Posted by Racingsnake
I started reloading for my father at 10 years of age. That was in 1951 and at 71 I expect I have shot more than 100,000 rounds of very accurate rifle and pistol loads. I am a trained gun smith for my own weapons and won't accept a group greater than a half inch at 100 yards for all of my rifles. My best pistol is a Ruger Super Blackhawk .44 mag that puts 4 rounds in a 3/4" group with 2 rounds that consistently take it to 1.25" at 25 yards. That is my preamble to the use of Lee case length trimmers. My first task is to measure a good number of cases to find the minimum length. Take one of the longer cases and trim with a new Lee trimmer to find it's cutting depth by measuring the case length. Using a fine stone with the length gage in a drill press and bring the tip to the stone very gently to take off small amounts of metal until it cuts the same case to the minimum length by repeated trials. Once you have reached the desired length bevel the edge of the tip to leave 2/3rds of the flat face of the tip so the ware is minimal on the contact surface and won't hang up on the primer hole edges. I then put the shell base chuck in a flat base machine clamp leaving the cutter in the drill chuck and insert the probe into the shell until it is aligned and bottomed out then clamp it tight. Set the depth stop at that point and start trimming at the rate of 150 to 200 shells per hour. Deburring inside and outside the case rim and uniforming the inside primer hole are essential to best accuracy. All your cases will bell the same minimal diameter to accept the slug and maximize case life. Good accuracy starts with identical cases which you will need to sort into categories of brand and weight within brands. All should end up accurate within their own uniformity but at different grouping on your target. Good shooting my friend.
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