Bullet seater problem
Quote from Reloader on July 5, 2016, 7:55 pmI have an RL 550B. I have used the same set of Dillon dies to crank out thousands of 223 rounds. I have used Sierra and Hornady 52 and 69 gr boat tail bullets exclusively. No issues. That is, until I bought a box of Sierra 69 gr TMK bullets. The seating die leaves a pronounced dent in the bullet in the form of a ring about a third of the way down the bullet from the tip. We're not talking about a dent only I can see. It's a very deep dent. I can use another bullet (Sierra Match King 69 gr) on the same run, and there is no dent. Some people have said I need to "turn the seater cup around, as it is not matching the shape of the bullet". I have taken the die apart several times for cleaning, and saw no "cup". I do not notice having to use any more force to seat this new bullet. This ring dent dramatically affects precision, as my groups have opened up from 1 inch to about 8 inches at 100 yards.
I have an RL 550B. I have used the same set of Dillon dies to crank out thousands of 223 rounds. I have used Sierra and Hornady 52 and 69 gr boat tail bullets exclusively. No issues. That is, until I bought a box of Sierra 69 gr TMK bullets. The seating die leaves a pronounced dent in the bullet in the form of a ring about a third of the way down the bullet from the tip. We're not talking about a dent only I can see. It's a very deep dent. I can use another bullet (Sierra Match King 69 gr) on the same run, and there is no dent. Some people have said I need to "turn the seater cup around, as it is not matching the shape of the bullet". I have taken the die apart several times for cleaning, and saw no "cup". I do not notice having to use any more force to seat this new bullet. This ring dent dramatically affects precision, as my groups have opened up from 1 inch to about 8 inches at 100 yards.
Quote from Reloader on July 13, 2016, 10:54 pmIt sounds like the TMK bullet has a different angle to the ogive of the bullet, more like a VLD bullet. The seat stem has an angle machined into it. It sounds like a different angle is needed. I have some of those bullets at home, so I will have our engineer measure the angle of the ogive. Give me at least a few days to get some results.
It sounds like the TMK bullet has a different angle to the ogive of the bullet, more like a VLD bullet. The seat stem has an angle machined into it. It sounds like a different angle is needed. I have some of those bullets at home, so I will have our engineer measure the angle of the ogive. Give me at least a few days to get some results.
Quote from Reloader on March 22, 2017, 10:01 pmDon't know if this would answer your question. And I know this is my first post. Just ordered my first press too yesterday. But been reading a lot in forums and the net before taking the plunge. And I did come across this. Hope this helps..
https://www.google.com/amp/s/sierrabulletsblog.com/2016/04/20/seating-concerns-with-sierra-tipped-matchking-tmk-bullets/amp/
Don't know if this would answer your question. And I know this is my first post. Just ordered my first press too yesterday. But been reading a lot in forums and the net before taking the plunge. And I did come across this. Hope this helps..
Quote from Reloader on March 22, 2017, 11:13 pmWe didn't find any appreciable difference in the ogive on the 69 grain TMK, and CFE223 powder. I had no marking on the projectile from the seat stem.
The heavier TMK .224" bullets do have a different ogive. They are much like VLD projectile. The Dillon seat stem will leave a visual mark around the ogive. No effect on runout or accuracy that we could determine.
We didn't find any appreciable difference in the ogive on the 69 grain TMK, and CFE223 powder. I had no marking on the projectile from the seat stem.
The heavier TMK .224" bullets do have a different ogive. They are much like VLD projectile. The Dillon seat stem will leave a visual mark around the ogive. No effect on runout or accuracy that we could determine.