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An interesting article published here is a good read for you.
http://bulletin.accurateshooter.com...nges-with-barrel-length-223-rem-test-results/
If he built the gun with OBT the reason I think he should of tryed paper.As I mentioned earlier in this thread, if you load to OBT nodes, you may not see an increase at all, possibly even a very slight drop in MV, with the 32" barrel. However, the pressure required to achieve that velocity will be lower in the longer pipe. This can be important if pressure and brass life are poor. It's also important when setting up a new build. As an example, a friend decided to set up a .284 Win Open rifle. Unfortunately, he chose to go with a 30" barrel. He found he really couldn't hit the desired OBT node (velocity) without generating undesirable pressure levels. A few minutes spent beforehand with Quickload would have saved him a to of time and $$$.
The Speed are all different and all shoot very accurate . The node is tuned with a tuner. When working with a tuner OBT means nothing.Stocks and barrel contours have little to do with OBT nodes. As far as different length barrels producing similar velocities with comparable charge weights when loaded to an accuracy node, that's exactly what I said. Extra barrel length may not mean extra velocity at all. However, the pressure required to reach that velocity will usually be lower in the longer barrel.
Why would anyone change from a 6br to a dasher ? Long distance is all about bullet time in the air . LarryUsing the same powder, the difference in velocity between a 30" and 32" barrel is almost meaningless, even at 1000 yd. It will certainly fall within the window of lot to lot powder variation. You can argue this all you want, but the fact is that small increases in barrel length past about 28" or so make very little difference in velocity, usually well under 10 fps gained/lost per inch of barrel length. Quibbling about 10-20 fps difference is a waste of time...you simply can't shoot the difference. However, dropping the pressure with the longer barrel might make a big difference in brass life because most of us are running loads at or near max pressure. This is the third time I've stated the same thing, but you want to argue about for reasons I don't understand. Go right ahead, but what I've stated is correct.
You lost me. I thought the thread was about barrel length relative to velocity? The obvious answer to your question is more internal cartridge case capacity. I may be wrong but once the powder charge is burnt up in the barrel, would not the extra length serve as friction and cause a loss in velocity?Why would anyone change from a 6br to a dasher ? Long distance is all about bullet time in the air . Larry
Bullet speed will increase till the resistance pressure gets greater then the pressure pushing . The amount of gain depends on the burn rate of the powder .You lost me. I thought the thread was about barrel length relative to velocity? The obvious answer to your question is more internal cartridge case capacity. I may be wrong but once the powder charge is burnt up in the barrel, would not the extra length serve as friction and cause a loss in velocity?