Question to ID Dillon parts

[r.j.medals2]

... Question to ID Dillon parts [i think these are Dillon parts] can anyone identify these parts they are 1 inch across and 3/4 inch deep with different sized holes corresponding to the cal/dia of bullets . What are they called ? i am going to list them on the EE but am unable to locate in a catalog. Cheers

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[Ganderite]

They are probably not Dillon parts.

They are gauges to find the ogive of a seated bullet, so a useful COL can be measured from the case head to the ogive.

The actual measurement would be from the case head to the top of the nut.

If I use the Sierra Prohunter 180 gr bullet and I know it is exactly 20 thou off the rifling, I can put the nut on it and get a measurement, of, say 2.95"

If I want to try the Nosler 180 Partition, and want to set it to 20 thou off the rifling, so as to not waste time and expensive bullets, I seat the bullet long and take a measurement withthe nut, and then seat deeper and deeper until it is seated at 2.95", to the ogive.

The nut has the correct size hole for 6 different calibers. I have one and use it all the time.

I have also made a similar tool, using a piece of rifle barrel and touching the bore with a throating reamer. Looks like this in use. Measure from case head to top of tool.

Advertise these as COAL Tools. Worth about $20 each.

 

[OldDude]

I think Brownell's / Sinclair International listed those in their catalogs at one time. Look for Ogive measuring guages.....

 

[r.j.medals2]

Thank-you !