Two adjustable small hole lapping tools made to open up the bullet chambers only in Wilson straight line seating dies for cast. Made from a section of 3/8" aluminum shotgun cleaning rod.
One on the right is for .30 cal. One on left is for a new 7x57 Mauser seater. Needed to go out .002"+ from as recieved .285," to .287+. -
" for a Venezuelan 98 Mauser short rifle.
Partial case has the flash hole drilled out and acts as a guide bushing and stop for lap.
R.
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Tumble lube adds about .002 to diameter...making it even more difficult to fit seater
I need to have Wilson make me a custom oversize seater. Or maybe I can make one myself using mini lathe.
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Honing out .002, seems very difficult to me, what if you go too much? Nosee.
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With these chamber seating dies, the lapping is only in the part where the bullet is captured and going too far is not really that critical because during the seating operation, the base of the bullet already sits in the case mouth and the nose is captured by the ejector pin, which aligns everything before the seating of the bullet begins.
When opening up these dies to accept oversize cast bullets, I only lap this part of the chamber enough to allow the larger diameter casting to easily and freely fall into it's proper spot. But it is still a lap and try operation, non the less. Conservatively and carefully
Unlike enlarging a lube-sizer die for example, where it's not difficult to quickly go too far.
R.
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If seating the bullet longer, wouldn't a standard seating die work ? Don't these have more clearance for fatter bullets. I do not own just a regular seating die is why I ask.
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If you are talking about the standard seating die that comes with the normal loading die set, sure they can be used and I have and do use some of them. But it's all about concentricity and reducing the run out of the loaded round. There is not a standard seating die as they come from the manufacturer that can consistently seat the bullet as straight in the case as the straight line chamber seater. At least, I have never seen or used one that can.
A straight line chamber seater significantly reduces the run out of the loaded round, especially with the oversized cast bullet when compared to the standard die set tool.
R.
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To improve concentricity when using a standard seating die you should seat the bullet halfway, lower ram, rotate cartridge 90 degrees, then fully seat to your required length. This works if bullet and case neck is concentric.
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I have used that method and still do occasionally for some calibers for which I don't have a need or can't get a chamber seater. Some times it works and some times it doesn't, as verified by a concentricity gauge. So mostly, I don't bother rotating the case anymore. It still simply can't match the accuracy and consistency of the chamber seater.
R.
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Have you ever used LBT's method of lengthening throat to accept his longer bearing surface bullet. This design works, but inline seaters need to be opened. I have had to hone out My Forster and Redding Compitition seater.
I must try the Wilson.
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wimilkman
30
pat i.
18
Tom Acheson
14
Aaron
12
BRatigan
10
MarkinEllensburg
9
Ed Harris
8
mashburn
6
porthos
5
MP1886
4
