Does stainless run faster ?

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  • TexMex247

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    I just finished running a SxS test of a batch of ammo. It was fired through a bolt action 20" as well as an 18" SS gas gun. The bolt rifle by Howa has a heavy blued barrel. The gas gun is a diamond back AR10. After looking over Chrono data I was surprised by some results.

    In spite of the extra 2 inches and no dissapation of gases behind the bullet, the Howa ran only 18-28 fps faster. I was expecting at least 40 but closer to 50 fps more. I know there are a ton of factors to consider but I've found a similar relationship between my white oak AR15 upper and a 20" blued counterpart.

    Do stainless steel barrels run a bit fast by nature ? Or is it just an odd coincidence?
     
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    Txhillbilly

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    Barrel's will usually shoot at different speeds. There are too many variables in play, but the type of steel really doesn't matter.
    The way the barrel is rifled, style of rifling, number of grooves. Whether or not the barrel's have been lapped. Even different types of coatings / treatments will have differences in the velocities you will get between barrels.

    Barrel velocity differences are no different than the velocity differences you will have shooting the same weight of bullet in different styles and coatings.
     

    TexMex247

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    Admittedly I know a lot of things come into play. In this case, I always thought the 308 hits its peak at 21.5" with most powders. When I did a similar test with a Remington 700 at 24" it did indeed gain over 100 fps with the extra 4 inches over the Howa. I thought for sure the gas system would also effect velocity but it didn't seem to matter.
     

    kyletxria1911a1

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    Barrel's will usually shoot at different speeds. There are too many variables in play, but the type of steel really doesn't matter.
    The way the barrel is rifled, style of rifling, number of grooves. Whether or not the barrel's have been lapped. Even different types of coatings / treatments will have differences in the velocities you will get between barrels.

    Barrel velocity differences are no different than the velocity differences you will have shooting the same weight of bullet in different styles and coatings.
    I've got ax18.5 in bbl on it now question for you is sir in order to get me to 1k should I put a 24 in on it
     
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