Comments on: 21st Century’s Impressive New Concentricity Gauge

By: michael smith

michael smith — Thu, 18 Sep 2025 06:23:52 +0000

where can i buy one

By: Alex

Alex — Sun, 11 Aug 2019 13:19:04 +0000

I have one and indeed the small roller bearings cause larger rounds to roll off the blocks. Accuracy One gauge is better engineered with larger rollers providing deeper round placement and stability. The roller wheel lacks a handle to spin it and hence you wind up putting too much pressure on the wheel to turn the round causing instability. Also, unlike the Accuracy One the dial does not have a screw that can easily position it up or down…… Danie, as far as your question the only gauge that I use all the time and it corrects run out is H&H gauge, which is hands down the best product on the market and does not have an even close second. As far as Century 21 gauge… its a good concept but needs tweaking…. Accuracy One seems like the fully executed project albeit Expensive.

By: Danie

Danie — Sun, 14 Apr 2019 15:36:21 +0000

Hi, in case your bullet is not inline, how do you press it to the correct position

By: Sky

Sky — Sat, 21 Apr 2012 21:05:08 +0000

Over engineered and less precise???
Is that an oxymoron like cheap luxury?

Since I like over engineered American made products, I ordered one. I will post my experience with the 21st Century Concentricity setup soon.

By: Joe

Joe — Thu, 29 Dec 2011 02:52:45 +0000

product looks nice, however it also looks to be over engineered and less precise than comparable products already available on the market.

By: Randolph

Randolph — Wed, 28 Dec 2011 13:24:52 +0000

@EDITOR
Call me a nitpicker, but the fact the RCBS designers didn’t make a good design, doesn’t change my statement.

By: Josh Benin

Josh Benin — Wed, 28 Dec 2011 00:42:13 +0000

Randolph makes an excellent point – this would appear to be an excellent design for convenience, but for best accuracy fixed supports (eg fixed balls) are better.

By: Randolph

Randolph — Tue, 27 Dec 2011 10:34:56 +0000

At least in theory fixed supports are superior to roller bearings. Everything that turns or moves adds some tolerances to your measuring output.

EDITOR: Problem with fixed v-blocks, as on the RCBS Casemaster, is that the Vs have a flat surface that doesn’t match the case taper. You have to push down on the case pretty darn hard to keep it from rocking. There is a lot of drag and this makes it difficult to get repeatable measurement.