'[R-DEV wrote:Gaz']your sight's off at 100 yards

clickity-click. Unless the adjustments on your scope aren't that small. Over distances relevent to a scoped precision rifle, that grouping will be greater effected, not even counting wind/sun/terrian adjustments.
When testing loads for groups, point of impact doesn't matter provided you use the same point of aim.
As for the issue of dispersion...
The reason for shooting at close range is to get an idea of what the rifle is capable of for the hopes of being able to hold the groups at longer range. That 100 yard .47 inch group is about the same as you can expect at 200 yards, many 50BMG shooters find that the bullets don't even "goto sleep" until around 200 yards due to coning motion of the bullet.
As for my abilities to shoot at distance?
Here's a 100 yard group from my 300WinMag,
Here is the same load shot at 800 yards in a left to right wind requiring 5.5MOA of windage. Yes, it's still a sub-MOA grouping that you can almost put your hand over. Hold a 5 dollar bill up to the monitor for comparison and scale.
BigPipe wrote:WOW, peeps in usa are allowed to own these tank killer? damn
an assassin can take out anyone, helicopters etc. isnt the president a bit worried that his vest cant stop such stuff?
The 50BMG is not that impressive in my opinion. First off it is not some "tank killing" round. I have a 1 1/4 inch mild steel plate and with 700grn AP bullets it has only managed to pierce it completely 4 times out of around 40 impacts. Compared to my 300WinMag with 163grn Ap bullets which has managed to pierce the plate only once out of 15 shots, the ratio is comparably the same.
Most 50BMG is rated to only pierce around 1/2 inch of actual armor rated hardened steel. Something it can only do to roughly 500-600 yards before velocity drops off enough that the kenetic force falls to a point where it will fail to penetrate.
Firing the round to long range is NOT easy, just because it is a bigger bullet does not mean that it allows for a person to forget or not take into consideration wind/trajectory or various other things. In fact to be able to shoot it much beyond 1200 yards you have to make use of special scopes, scope bases, and be quite experienced in shooting to long distances.
But yes, we are allowed to own them in the US. Barrett originally made the M82 for the civilian market and the success was such that the military picked it up. I never really wanted one until California decided to ban future sales of the guns within the state so I finally picked one up. "cheap" ammo costs me around $.85-1.25 a shot to handload. If I wanted to buy the stuff from a local gunshop it would be 2.50-3. bucks a shot. "Match Grade" ammo costs me anywhere from 1.25-2 bucks for the bullet alone before any powder, primer, or the cases.
Lastly, it's guns like this that should keep the politians on their toes. The 2nd Amendment has nothing to do with hunting or sport. It's meant to give the civilian populace teeth to bear against an agressor or a corrupt government.