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I think it's nearly impossible to get long heavy boatail bullets from long barrels, shooting anywhere near short light flatbase bullets from short barrels. Nor will it ever be needed to compete at 1Kyd. Different games

Whoa, Whoa, OH NO..... Well, unless your scope is unreliable to a point that negates all common sense.... A scope's POA adjusted fully to POI is right where it ought to be [POA = POI]

I got the impression that Vaughn's device went unfinished but was a starting point. Has anyone been successful with this to date? Would be a fantastic(and I think useful) toy!

I'm trying(and failing), to get anyone here to demonstrate or even discuss the effects of bearing length variance. I'm trying to goad anyone into discussion about the challenges of isolating bullet measurements into the actual parts of concern. Without a consensus(with atleast a rational...

Everything about YOUR post here is scary.. Let's see if I understand this correctly; 4% of your 989 bullets(mixed lot?) fell beyond +/- .001 [0.2% of mean bearing], with 6 of them(OMG) -.009 [1.9% of mean bearing].. And as a pillar of reliance, you complained to Berger because this caused what...

Well I for one would be interested in what BASE to OgV measurements mean exactly. How would they matter, and what is your basis? Stuff like that.. This is what thread starter wants to know, so he can determine a tolerance. My contention is that single lump sum comparisons are utterly...

I'm not suggesting anything wrong with Jerry's tools or approach. I'm merely observing data before us(as you should) that clearly demonstrates ogive radius variance. This is where ogive radius can affect your entire basis of measurement (the datum). Not exactly. Included in the mix is base...

I believe there is alot said in Jerryhm's data. Possibly overlooked is ogive radius variance invalidating his data, and yours Mike. You might notice that his seating depths were all over the place. Now regardless of variance in bearing/base, the seating should have been the same. He's using an...

I'm with Al It's common to jam bullets into the lands, and to fully engrave on firing -from jammed(no run at it), surely takes higher forces than that of bullet seating into/from necks. Now if you don't measure your stuff, and work up stiff loads with one lot of brass, only to mix lots later...

I know what you mean, but there is no correct answer other than 'enough'. Clearance for one of my guns is .001 as stated(.0005 per side), and my pressures, velocities, and ES are excellent. Then again, I measure my stuff and take care of my chamber/gun. Also, the throat on this gun is coaxial...

Never heard of one clearance amounting to better than another, outside of excessive for consistent tension after all the sizing. Any clearance from +zero on up works.. I've fitted necks to 0.001 under chamber neck without issue. With this I never needed to neck size at all. In fact, the entire...

I didn't see Art's writing of this, so I'm unsure of the context of it. Was Art talking about expansion to proper turning mandrel fit, or neck clearance?

Absolute misinformation about ALL scopes being in MOA... Most Leupolds, and many others are IPHY. Of course, 1/4" per 100yds, might not actually adjust that way. It could be less or more, and has to be validated for entry into ballistic software(just like scope height). This is significant...

I'm followin what you're sayin. But I get the impression that FL sizing is all the rave in BR. Easy bolt turning, less bag upsetting.. I would think they would atleast be custom FL dies. But the best die in the world is likely your smoking chamber. This is what straightens cases. Downsizing...

This is where alinwa's declaration comes into play. The neck is not true to anything if there is high clearance and you are not fully jammed into the lands. With this, the neck is laying against the chamber far from centerline. And I wonder... Did Bill Davis actually measure & quantify in-bore...

Well, I believe I got it right with a view of Al's notions relating to case life -at very high pressures seen as needed to be competitive. If so, I think Al is absolutely right, but not w/respect to long range cartridges, or competition. David Tubb tested large & small primers with his 6XC, and...

I'm sorry, I thought you wanted to discuss advantages to small primers, that Al had been referring to.

Well the most 'accurate' at 1Kyd these days rarely breaks 1/2moa. Any cartidge on earth is capable of this... And although every anomoly has had it's day, still the biggest 30cals win most often. They produce better in the wind, and only need 1/2moa to win. But conceding to a 260AI releasing...

I think the idea is that additional pocket brass allows higher pressures for a given brass life, allowing faster powder, with a higher efficiency burn. I picture it as putting your tune well into an extreme. Then all you need do is stay into extreme (tolerance). I doubt most reloaders could get...

Sounds right Something like this: By null at 2010-07-19 You should consider however, that this provides no more than a 260AI or 6.5-308AI(in Lapua case). And these are far less work..