There's absolutely nothing special about taper lapped button rifled barrels....there, I said it. This is one of those areas of "conventional wisdom" that I defy (along with PAS is better than SAP, etc) because I've not been able to prove all the anecdotal info is true. We're not using button rifled barrels because they've not passed our test protocols (PROOF and LW are the exceptions). Our own cut rifled barrel, along with others that have passed our test protocols have proven to shoot at an incredible level of accuracy and consistency. Our data and the many test targets from the Lapua test facility is what I'm basing my position on, not regurgitated anecdotal info. If I can find a celebrated button barrel that passes my test protocol, I'll use it, but until then....
The first 500 rounds out of test rifles I build are 100, five shot groups. This group is typical, not cherry picked, within the first few rounds, generally between 30 and 50 and yes, this is the Vudoo (Ace) Cut Rifled Barrel (this one is 22") with my chamber (I built this particular rifle last weekend.). The 10 shot groups are barely larger than this group. No fiddling or anxiety over fitting a barrel, no posts on the internet about how nervous I am to chamber a barrel tomorrow, just put it in the lathe, dial it in, hit cycle start. The exact process in the lab is also used in the production facility in St George.
To take this a bit further, Vudoo held the unofficial internal record at the Lapua test facility for the smallest groups shooting against rifles with taper lapped button barrels. I know the argument most are hanging their hat on is that all the so and so's winning BR matches are using such 'n' such taper lapped button barrel, but, do you know what they say when you ask to see their test data they personally generated when they tested one barrel against the other? The short answer is, the data doesn't exist. Anyone with a strong character could show up at a BR match with a quality cut rifled barrel and do far better than the believers of taper lapped barrels would be willing to believe. As contentious as this debate has been elsewhere, just wait til I start talking about data from other twist rates....
Many posts above have already covered the V-22 as the basis of an Olympic platform....I'll avoid repeating it all over again.
MB