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David Tubb Final Finish Bullets

 
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  #1  
Old 09-05-2007, 01:08 PM
RDG RDG is offline
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David Tubb Final Finish Bullets

Has anyone ever fire-lapped their barrel with these bullets and lost up to 200 fps. velocity. Why would that happen?:confused:
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Old 09-05-2007, 01:14 PM
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RDG, no I haven't used the product.

What caused the 200fps drop was the removal of barrel steel. The bullet is having an easier ride down the barrel thus chamber pressure is reduced. You might get the speed back at the cost of greater powder consumption.
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Old 09-05-2007, 01:32 PM
RDG RDG is offline
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Cowboy,
I know but, they claim increased velocity.......
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Old 09-05-2007, 01:34 PM
RDG RDG is offline
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Cowboy,
I know but, they advertise higher velocity......
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Old 09-05-2007, 01:35 PM
RDG RDG is offline
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Sorry! for the double posts!
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Old 09-05-2007, 01:49 PM
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I used FF in a .308 Win that fouled very badly but shot quite well (1/2 in). I haven't chronoed my loads, but with a book max load of Varget and a 178 A-Max, my primers (CCI) look just like they do when loaded with a starting load. I strongly suspect my pressure and velocity are low due to less friction in the bore. As such, I suspect book max can be exceeded without increased pressure. However, I would never advocate exceeding book max.
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  #7  
Old 09-05-2007, 01:53 PM
RDG RDG is offline
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Cowboy,
The rifle is a Remington 700 in 7mm Rem. Mag. ....I had to go
up 4 grs. of powder to get my old velocity back......

RDG
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