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Question about .308 and 7mm-08 barrels

 
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  #8  
Old 06-11-2011, 07:50 AM
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Re: Question about .308 and 7mm-08 barrels

Guess my chrono was lying to me. Guess Dan Liljas article about the Ballistic Effects of Altitude Tempature and Humidity is useless as well
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  #9  
Old 06-11-2011, 12:02 PM
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Re: Question about .308 and 7mm-08 barrels

Quote:
Originally Posted by bastover View Post
Guess my chrono was lying to me. Guess Dan Liljas article about the Ballistic Effects of Altitude Tempature and Humidity is useless as well
Thats EXTERIOR BALLISTICS not interior ballistics which is what we are talking about here. Barrel length, powder burn rates, and chamber pressures and ambient (POWDER) temperatures are directly related to bullet velocity.

Do yourself a favor a Google Density Altitude
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You can bet your ass on that !!
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  #10  
Old 06-11-2011, 04:14 PM
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Re: Question about .308 and 7mm-08 barrels

What we are talking about is 7mm-08 or 308 rifle barrels and what lengths. I simply stated that a rule of thumb if you will was 40-50 fps per inch of barrel loss. A gentleman stated it was different that SAAMI states for a rule of thumb. Well I reposted that it may just be difference in atmospheric conditions and humidity causing the difference In the vel. All this inside ballistics come from him. I know we are not reading the vel. inside the barrel the bullet comes out of the barrel. I read SAAMI and right off the bat they state depending on componets equipment TEST CONDITIONS may cause different results. You gentleman have a nice day.
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