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Enzo

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300 wsm 190 bergers vld 2800fps Browning A Bolt BOSS 23"barrel, Is my bullet out of my barrel by time my gun moves from recoil? What if I was it was a 26" barrel like some other guns?
 
No the moment the bullet starts moving recoil begins, it shows up a lot more with hand guns, i.e. a heavy load generally has a higher point of impact on the target than a light load does. With a rifle I believe that you could see it by using a chronograph. In that if you have the rifle tighter to your shoulder versus giving the rifle a certain amount of free recoil, I think it's possible to see the effects down range between 2 different shooters as well.
 
300 wsm 190 bergers vld 2800fps Browning A Bolt BOSS 23"barrel, Is my bullet out of my barrel by time my gun moves from recoil? What if I was it was a 26" barrel like some other guns?

The rifle does have movement before the bullet leaves the barrel. How much depends on several factors like hold, cartridge power, rifle weight etc. Generally, 1/10th to 1/8 th of an inch or so with center fires. I don't think a few inches of barrel length would make a lot of difference. This movement is why consistency of shooting form is so important to achieve accuracy.
 
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