They've been on backorder. Measures off shoulder vs base...waiting on mine. These work with most calibers as well unlike instant indicator.Accuracy One comparitor works well
Doesn't seem to be. It is very repeatable. Very easy to use. I don't make a habit of pounding on it.Is the Accuracy One comparator sensitive to the amount of pressure when pushing the case into the comparator?
I just ordered a complete set of these today.I use the headspace and bullet comparators from Short Action Customs ... they're cut to much more precise angles and seat much better than the Hornady versions. With the SAC inserts, it just takes a little jiggle on the base and they lock right into place for a clean micrometer measurement. The headspace comparator inserts are amazingly solid since you buy them to precisely match the shoulder angle of your cases. Highly recommend this product ... but it ain't cheap.
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This is also what I useSELLING - Caliper Bases - $22.00 Shipped
Updated - 12.31.2024 - Current time from purchase to received - 3-4 days. Ensures consistent and repeatable measurements during the bullet seating process. See forum comments, reviews and feedback. PM me for additional information. 6061 Aluminum - Hard Anodized Black. Use in conjunction with...forum.accurateshooter.com
Presumably the Accuracy One tool doesn't have shoulder angle cut into the comparator, only the shoulder datum, e.g. 0.330", 0.400"? It can't because various calibers of the same shoulder datum have different slopes. I see a significant benefit to the Short Action Customs design where contact with the case is the full shoulder area rather than a single circle point of contact. Whidden's aluminum shoulder bump gauges which come included with their dies would benefit from adding this shoulder angle into their gauges also. Having that slope in the comparator would make it much easier to ensure the case is sitting properly.
I have mitutoyos as well. The problem lies with the cartridge base. You can measure the same cartridge, 3 different times and come up with 3 different measures. Not by much. You almost have to spin/wiggle the cartridge base to achieve perfect flat. By that time your ogive is scored or stuck on the other end. My accuracy one is in the mail. It sure appears by the video to make life easier. I can only say , WIll ADVISE....I use a Mitutoyo caliper. And I have a reamer cut from the barrel stub for one of my rifles (unfortunately it's not cut to fit onto calipers making it more difficult to use).
x47Mike - it's a single point of contact while holding the other end in your hand versus aligned in a caliper jaw.
My point is the original poster found a solution to a problem that doesn't exist. The greater issue is play in the pieces attached to the calipers. The Forster Datum Dial kit is a pain in this regard. The Accuracy One tool is handheld against a circle of contact at the other end. As a result I'm not surprised it's very difficult to use with smaller calibers. (However I like the notion of measuring cartridge shoulder to bullet ogive instead of CBTO.) The SAC gauges achieve ease of use/alignment by cutting the shoulder into the gauge but how much play is in the insert to body fitting? I'm looking for a solution to ditch the Forster. The Whidden shoulder bump gauges provide that for CBTS measurements (although I wish they cut the shoulder into the gauge as that would make them easier to use). Currently I still have to use the Forster for CBTO measurements. (In all cases the Mitutoyo calipers have plenty of surface area on their jaws for the base of the cartridge to align to.) I'm leaning towards trying the SAC as the notion of achieving concentricity with the gauge when simply handholding the cartridge base when using the AO gauge concerns me. If they cut the shoulder into their gauge this concern would dissipate a lot.
The Sinclair comparator is an excellent unit also. Ive had great results with it.I use the headspace and bullet comparators from Short Action Customs ... they're cut to much more precise angles and seat much better than the Hornady versions. With the SAC inserts, it just takes a little jiggle on the base and they lock right into place for a clean micrometer measurement. The headspace comparator inserts are amazingly solid since you buy them to precisely match the shoulder angle of your cases. Highly recommend this product ... but it ain't cheap.
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Please let me know. (Ideally also try some 223 if you have it.)I have mitutoyos as well. The problem lies with the cartridge base. You can measure the same cartridge, 3 different times and come up with 3 different measures. Not by much. You almost have to spin/wiggle the cartridge base to achieve perfect flat. By that time your ogive is scored or stuck on the other end. My accuracy one is in the mail. It sure appears by the video to make life easier. I can only say , WIll ADVISE....
I'm not quite following how you use the machinist bar. Could you post a photo please.I have a set of dedicated calipers for the comparator. I have the anvil as well. I use a machinists bar to adjust the alignment. It really speeds up with making sure everything is parallel and the caliper is reading correctly. The set screw on the comparator and anvil helps with fine adjustment on the caliper jaws.