Bearing Surface
- Thread starter bdale
- Start date
Here is the problem with the Tubb and Sinclair units.
1. I purchased one of the Sinclair comparators which came with the 6mm (.243in.) 6XC insert. Nicely finished but unfortunately it didn't fit the ogive of either end of the bullet - http://www.sinclairintl.com/reloading-equipment/measuring-tools/bullet-comparator-inserts/bullet-comparator-prod40165.aspx
2. Then purchased the Tubb inserts for 6XC and neither the top or bottom inserts fit the ogive of either end of the bullets. They didn't even match themselves. Also the top insert did not fit the shaft of the dial indicator very well.
3. I purchased the 6mm inserts from Hornady and they both matched the ogive of both ends of the bullets and matched each other. I can use them with the Sinclair and Tubb comparator base but feel they are just slower that way.
4. The angle of the dial indicators of all the comparators (Sinclair, Tubb, King, etc.) makes them somewhat hard to read when sitting on a table. For me they are a lot slower than the caliper method and no more accurate and a hell of a lot more expensive. To each there own I guess
1. I purchased one of the Sinclair comparators which came with the 6mm (.243in.) 6XC insert. Nicely finished but unfortunately it didn't fit the ogive of either end of the bullet - http://www.sinclairintl.com/reloading-equipment/measuring-tools/bullet-comparator-inserts/bullet-comparator-prod40165.aspx
2. Then purchased the Tubb inserts for 6XC and neither the top or bottom inserts fit the ogive of either end of the bullets. They didn't even match themselves. Also the top insert did not fit the shaft of the dial indicator very well.
3. I purchased the 6mm inserts from Hornady and they both matched the ogive of both ends of the bullets and matched each other. I can use them with the Sinclair and Tubb comparator base but feel they are just slower that way.
4. The angle of the dial indicators of all the comparators (Sinclair, Tubb, King, etc.) makes them somewhat hard to read when sitting on a table. For me they are a lot slower than the caliper method and no more accurate and a hell of a lot more expensive. To each there own I guess
My buddy put a 4 digit Mititoyo dial indicator on his and it repeats to 1 ten thousandths every time. He even put on a cable attachment where all you do is push a button on the end of the cable and it lifts and holds the dial stem up for you to sit the bullet in. Now you release the cable and the stem goes down and measures the bullet. Big digits on the Dial indicator and very easy to read. Very fast and easy. The Pieces fit all the bullets I tried and repeat. All you do is sit the bullet in point down and let the stem down with its piece attached. I tried every other attachment and even a gizzy and they don't repeat. The gizzy was the worst. Matt
Matt is right you have to put the bullet point down, i have both and both work the same……. excellent. I did modify one to do point up and it is set up to measure loaded round seating depth, i can measure it with in a .0005. With a caliper and the davision or what ever you use with a caliper you are subject to feel and it is an other variable …….. jim
I have the Hornady comparator, hate it. But I love the Davidson base and nose pieces sold by Sinclair. The ogive fit is right on and repeatable. For bearing surface measurements I use two of the same caliber nosepieces.
I measure and sit each bullet in a plastic cup marked with the BS. Keep the largest pile with same or close measurements for match wotk. Save those .003 thou or more either side for sighters.
I measure and sit each bullet in a plastic cup marked with the BS. Keep the largest pile with same or close measurements for match wotk. Save those .003 thou or more either side for sighters.
http://www.accuracy1.com/products/bullettipping/
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