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375/408 Banded Solids Test

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  #92  
Unread 02-22-2010, 08:40 AM
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Re: 375/408 Banded Solids Test

Top Shot,
I talked to Steve Damron from Research Dynamics here in the US, they are addressing the
top band issue.

Dave
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  •   #93  
    Unread 03-05-2010, 02:01 PM
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    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by noel carlson View Post
    Kelly,

    The 431 grain version was a very early ZA375 design that had stability problems when fired at a MV greater than 2,600 fps. This was remedied to some extent by tail revision, which added an additional 150 fps from the same 8" twist.

    A 1: 6.5" twist stabilizes the 421 grain, 7.0 caliber, to it's maximum velocity of 2,950 fps from a CheyTac case. The 400 grain 6.5 caliber ZA can be driven to 3,100-3,200 fps from the CheyTac. We have not tried am AM loading.

    Both are capable of sub-half minute groups out to 1,500 yards, but we are looking for better data collection at the upcoming Las Vegas test.

    Best,
    Noel

    Noel,
    I am going to take someones suggestion here and order a second barrel for the longer solid bullets for my 375 snipe tac. Beacuse of lead times on barrels, I am going to take my chances and not wait until the NV shoot. Who would you suggest for the barrel maker and what twist would you reccomend for these 400 and 421 gr solids??

    I've seen some strings here talking about standard twists from 1 in 8...all the way down to 1 in 6.75 ???

    thanks in advance
    kz
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      #94  
    Unread 03-05-2010, 02:23 PM
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    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by Augustus View Post
    KZ, I have fired several of the bullets mentioned in this thread, I have done almost all of the testing on the various ZA 375, I have also shot the SMK and the Rocky MTN bullets. Here is what I have found:
    An 8 twist will explode the Rocky Mtn hollow point and alum. tip
    The SMK shot OK in the 8 twist, nothing spectacular
    The 6 cal ZA works nice in the 8 twist
    The 6.5 ZA is going to need at least a 6.5 twist
    The 7 cal will most likely need a 5.5 twist to stabilize at 2900
    The gain twist barrels should have entrance and exit twist with less deviation
    than my 13-6.5
    A 375 Chey w/o a break is not fun to shoot.

    Agustus,
    As I told Noel today, I can't wait for the NV shoot to order my second barrel. It's really for expiremental purposes. I would like to order a barrel designed to shoot the 7 cal solids in my 375 chey tac. Based on your data here, Im going to need a 5.5 twist. In your opinion what barrel would be best?

    The standard twist 1 in 5.5 or a gain twist to 5.5? Also, what would the gain twist start at to meet your "less deviation" suggestion?

    thanks,
    kz
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      #95  
    Unread 03-05-2010, 09:44 PM
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    Re: 375/408 Banded Solids Test

    Kelly, this is just a suggestion and others with first hand knowledge may disagree. Based on what I have seen so far, I would go with a 9-5.5 for the seven cal solid copper. I shot several of these from a constant eight twist and the bands held up fine. They stabilized nice in a 13-6.5 up to 2700 with around 1/2 min accuracy, the groups started opening up past this point with this barrel. The case is capable of pushing the sevens to 2900. I believe the 9-5.5 barrel will acheive 1/2 min with the solid copper sevens. Again, proceed at your own peril and know you are walking on unplowed ground. Bartlein is about the only game in town and they told me they were around 8 months behind. While we are talking LR rifles. I just got my 338/408 standard case with a 29 in. barrel yesterday. This rifle will eat anything, frankly I have never seen anything like it. During the load work up all shots fired were under 1/2 min. The load I settled on was 144 gr. of 50 BMG at 3200 with ES in the single digits. The firt LR target was 1224 yds. The dope was dialed in according to Horus Atrag. It was nearly dark and I fired 2 rds. They both rang the steel and hit just under 3 in. from each other exactly as the puter predicted. You are about to have some fun.
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      #96  
    Unread 03-06-2010, 12:36 PM
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    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by Augustus View Post
    Kelly, this is just a suggestion and others with first hand knowledge may disagree. Based on what I have seen so far, I would go with a 9-5.5 for the seven cal solid copper. I shot several of these from a constant eight twist and the bands held up fine. They stabilized nice in a 13-6.5 up to 2700 with around 1/2 min accuracy, the groups started opening up past this point with this barrel. The case is capable of pushing the sevens to 2900. I believe the 9-5.5 barrel will acheive 1/2 min with the solid copper sevens. Again, proceed at your own peril and know you are walking on unplowed ground. Bartlein is about the only game in town and they told me they were around 8 months behind. While we are talking LR rifles. I just got my 338/408 standard case with a 29 in. barrel yesterday. This rifle will eat anything, frankly I have never seen anything like it. During the load work up all shots fired were under 1/2 min. The load I settled on was 144 gr. of 50 BMG at 3200 with ES in the single digits. The firt LR target was 1224 yds. The dope was dialed in according to Horus Atrag. It was nearly dark and I fired 2 rds. They both rang the steel and hit just under 3 in. from each other exactly as the puter predicted. You are about to have some fun.
    Augustus,,,
    You mentioned "the case is capable of pushing the sevens to 2900", were you talking about the standard 375 chey tac? Am I correct in assuming that the 375 snipe tac can push the sevens to 3150 fps??

    By the way, Im sure you will love your new 338, I hear it's an amazing shooter!!
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      #97  
    Unread 03-06-2010, 12:42 PM
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    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by kellyzier View Post
    Augustus,,,
    You mentioned "the case is capable of pushing the sevens to 2900", were you talking about the standard 375 chey tac? Am I correct in assuming that the 375 snipe tac can push the sevens to 3150 fps??

    By the way, Im sure you will love your new 338, I hear it's an amazing shooter!!
    Augustus,
    And just to be clear, do you think the 9---5.5 twist barrel will stabilize the 7 cal to 3150 fps ??
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      #98  
    Unread 03-06-2010, 11:04 PM
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    Posts: 436
    Re: 375/408 Banded Solids Test

    My 375 is a standard case and 2900 is attainable, it is MAX. My 375 barrels are 30 in. The Snipe-Tac should push it faster but 3150 is probably being a little optimistic. As far as the seven being stable at 3150 from a 5.5 exit twist, I simply dont know and I will bet nobody else on the planet knows. If you order the barrel you will probably be the first to answer the question.
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