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Custom Made Rifle Bullets - Hand Crafted in England
             
  Rebated Boat Tail              
 

Boat tail bullets are extremely popular these days, they offer many benefits over a flat base bullet, don't they? The answer to that question is probably not as clear cut as some people would have you believe!

What I'm going to attempt to do here is to set out some facts, as opposed to opinion, so you can make your own decisions, based on those facts.

If nothing else you will be a little more enlightened about what you are shooting down range.

To the left are five bullets with Rebated Boat Tails (RBT)

RBT
   
 
     
Boat Tail  
     
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The Rebated Boat Tail (RBT) is not a new design, dating from the 1930's when Lapua introduced the D46 match bullet, they have been making it ever since, and it is still a proven and successful bullet. The strange thing is that none of the major manufacturers have taken up on this significantly better design of boat tail bullet. Let me explain why the boat tail,and in particular the rebated boat tail, are of benefit.

Perhaps we should state right up front; that the most benefit a boat tail, of any design, has is when the bullet is travelling at less than the speed of sound. Yes, it does help to reduce drag at supersonic velocities, but the major influence is the shape of the bullet point, or nose shape. The reverse is true at subsonic velocities, the nose shape has little influence while the base has a much greater influence on the bullets flight characteristics.

So, depending on what cartridge you are using, the most benefit you will get from the boat tail is gong to be a long way away, possibly way beyond the distance you are shooting at.

We should also make it clear that having a boat tail doesn't automatically make it an accurate bullet, it can actually reduce the accuracy of the bullet, as I will explain further on.

A boat tail does help to increase the ballistic coefficient of a bullet, but you also have to take into account that too much BC can make a bullet less accurate!

Personally, from a manfacturing point of view, it is far easier for me to make a rebated boat tail than a traditional boat tail, with that ease come a much higher lever on consistency during manufacture. If the boat tail is not the same length for the full circumference of the bullet, as it leaves the barrel it will be deflected by the muzzle blast.
The traditional style of boat tail does reduce drag slightly more than the rebated boat tail however, this is offset by the fact that it does allow the expanding gases from the powder charge to flow over the bullet and form a turbulant ball in front of it which the bullet has to pass through. This turbulant ball causes muzzle blast dispersion. The rebated boat tail acts the same as a flat base as it leaves the barrel, and doesn't allow gases to flow past the bullet, giving an approximate 15% reduction in dispersion caused by the muzzle blast, and consequent increase in accuracy.
  The rebated boat tail seals the bullet to barrel junction far more effectively causing a reduction in the rate of barrel wear.
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  Ok, so there you have the facts to think on, if you have any questions don't hesitate to ask, I'll do my best to answer them for you. At the end of the day there's only one way to find out if they are better, and that's to try them.
©MME Custom Rifle Bullets 2016