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375/408 Banded Solids Test

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  #127  
Unread 03-25-2010, 12:15 PM
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Re: 375/408 Banded Solids Test

Quote:
Originally Posted by Extremist View Post
Gerard is at the AIM show in Johannesburg right now, so it might be a week before he gets back to you. Sorry. The website has not been updated yet with a lot of the bullets, and the technical data section is rather lacking. GSC makes over 260 bullets, and they are so swamped right now they haven't had time to upload anything in the last year. It is a new bullet and so we have not heard from anyone who had taken it past 1000 yards. 5 guys have rifles built for these bullets, and they are waiting for the bullets to arrive before they can take it any further (only a small batch of samples was initially sent for testing). Waiting to hear back from a guy who is taking it past 1100 yards, and another who is taking to 3000m, so he has promised.

As for Technical Data, I can help out with much of that. Gerard has the entire file on it, but I can tell you it has a B.C. of 1.243 at 3100fps, and we have seen as much as 3400fps, which he has designed to be about the fastest you want to send that bullet (designed speed is more his thing). But the real kicker is that it maintains a B.C. of .9+ at 1200fps. The bullet likes an 1:8.5 twist, but it will work out of faster, and maybe (untested) as slow as a 9.

Unfortunately non of the test rifles we have shipped to are Chey-Tac's. Snipe-Tac yes, and a special built .375/50 case I have yet to see. No real extensive R&D yet. The design is the same as in the 295 grain .338 that has been sent all over the world since 2004, but I have not seen nor heard back from the guys buying them yet, but then again, I believe they are waiting on their rifles to get finished. Hope that helps.
Can you pm me your number or the number I need to call to order a box of these 420 gr bullets for my snpe tac? Thanks

kelly zier
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  •   #128  
    Unread 03-25-2010, 10:08 PM
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    Join Date: Feb 2008
    Location: Auburn Indiana
    Posts: 38
    Re: 375/408 Banded Solids Test

    From the inital testing in the Snip-Tac they reported seing 3,000fps before pressure signs, but I will have to mention it was with a longer then standard throat to allow optimum seating. It will work in a standard throat if seated anywhere between touching the rifling and before the first drive band goes into the case, but because of the length of the bullet, it occupies a lot of case capacity. A simple seperate throat reamer would do the trick. You could still shoot any other bullets as well, but it would have a little longer to jump before touching the rifling. Since it requires an 8.5 twist, a custom barrel is in order anyways. Like anything special, it has a few requirements. Hope that helped.
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      #129  
    Unread 03-26-2010, 12:53 AM
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    Join Date: Dec 2009
    Posts: 214
    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by Extremist View Post
    From the inital testing in the Snip-Tac they reported seing 3,000fps before pressure signs, but I will have to mention it was with a longer then standard throat to allow optimum seating. It will work in a standard throat if seated anywhere between touching the rifling and before the first drive band goes into the case, but because of the length of the bullet, it occupies a lot of case capacity. A simple seperate throat reamer would do the trick. You could still shoot any other bullets as well, but it would have a little longer to jump before touching the rifling. Since it requires an 8.5 twist, a custom barrel is in order anyways. Like anything special, it has a few requirements. Hope that helped.
    This is helpful...thanks a ton
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      #130  
    Unread 03-26-2010, 12:56 AM
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    Join Date: Dec 2009
    Posts: 214
    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by Extremist View Post
    From the inital testing in the Snip-Tac they reported seing 3,000fps before pressure signs, but I will have to mention it was with a longer then standard throat to allow optimum seating. It will work in a standard throat if seated anywhere between touching the rifling and before the first drive band goes into the case, but because of the length of the bullet, it occupies a lot of case capacity. A simple seperate throat reamer would do the trick. You could still shoot any other bullets as well, but it would have a little longer to jump before touching the rifling. Since it requires an 8.5 twist, a custom barrel is in order anyways. Like anything special, it has a few requirements. Hope that helped.

    Also,,,Do you know what powder and primer and OAL they were using to get this 3000 fps...And was this the sweet spot for accuracy????

    thanks
    kelly zier
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      #131  
    Unread 03-26-2010, 12:27 PM
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    Join Date: Feb 2008
    Location: Auburn Indiana
    Posts: 38
    Re: 375/408 Banded Solids Test

    Not sure what powder they used to attain the highest velocity, though they tested US869, 20N29 and as usual H50BMG. I think they ended going with the H50 due to consistency. I do know they also had the highest velocity with ADI2218 in their conversion...let me ask them the next chance I get to talk with them and get back to you here. I do know for testing the small lot we sent them they chose to load up to touching the lands. One thing I would check into would be the throat; might want to lengthen it. Best performance was with the longer throat, in our research, since the bullet is so long. I have a bullet drawing I can send you, if you are interested in the exact specs of the bullet (declassified so to speak), or I can just list what we have found so far.

    -AP

    Last edited by Extremist; 03-26-2010 at 12:31 PM.
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      #132  
    Unread 03-26-2010, 12:47 PM
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    Join Date: Dec 2009
    Posts: 214
    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by Extremist View Post
    Not sure what powder they used to attain the highest velocity, though they tested US869, 20N29 and as usual H50BMG. I think they ended going with the H50 due to consistency. I do know they also had the highest velocity with ADI2218 in their conversion...let me ask them the next chance I get to talk with them and get back to you here. I do know for testing the small lot we sent them they chose to load up to touching the lands. One thing I would check into would be the throat; might want to lengthen it. Best performance was with the longer throat, in our research, since the bullet is so long. I have a bullet drawing I can send you, if you are interested in the exact specs of the bullet (declassified so to speak), or I can just list what we have found so far.

    -AP

    AP,
    Please do send me the drawing,,,It would be very helpful

    thanks in advance
    kelly zier
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      #133  
    Unread 04-04-2010, 10:06 PM
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    Join Date: Feb 2008
    Location: Auburn Indiana
    Posts: 38
    Re: 375/408 Banded Solids Test

    Are you guys ready for the first sneek peek?

    -AP
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