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375/408 Banded Solids Test

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  #43  
Unread 02-10-2010, 11:06 PM
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Posts: 214
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.
LOL!! I imagine the 375 cheytac would just about knock my shoulder off without a break...I'm going to have a real ear blaster of a break for my 375 and I'm working on a stock design that will take at least 30% of the recoil off this big gun in addition to the break. I hope to share the results on this forum in the future.

Back to the bullets.......I need to order a barrel shortly....Are you guys suggesting a twist starting at 12 and down to 7 ish?? I would like to know the most aggressive twist I can have and still stabilize the 350 smk's for the 375 cal......Sorry, Im just not well versed in the barrel dept.

KZ
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  •   #44  
    Unread 02-10-2010, 11:23 PM
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    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by kellyzier View Post
    LOL!! I imagine the 375 cheytac would just about knock my shoulder off without a break...I'm going to have a real ear blaster of a break for my 375 and I'm working on a stock design that will take at least 30% of the recoil off this big gun in addition to the break. I hope to share the results on this forum in the future.

    Back to the bullets.......I need to order a barrel shortly....Are you guys suggesting a twist starting at 12 and down to 7 ish?? I would like to know the most aggressive twist I can have and still stabilize the 350 smk's for the 375 cal......Sorry, Im just not well versed in the barrel dept.

    KZ
    I just read one of Dave's old posts....16 to 7.75 twist up to 6.5 cal....7 cal would be for super super high bc's (lazers as Dave pointed out). I would like to come up with the best twist for real long bullets and still be able to stabilize bullets like the 350 smk.....So perhaps the 16 to 7.75 is the sweet spot...You guys agree?????????????
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      #45  
    Unread 02-10-2010, 11:38 PM
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    Join Date: Sep 2003
    Location: Nebraska
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    Re: 375/408 Banded Solids Test

    Kelly,
    I don't think you can get the best of both worlds with one twist rate. My barrel was designed so i could shoot the 350 smk and some customs longer like the 6 cal. ZA bullet, i have not shot any of these so i can't comment. Augustus stated that the 6.5 cal might need a 6.5" ending twist to stabilize it, and im pretty sure the jacketed bullet would come apart in that barrel. My barrel might work for that particular bullet, but i know it will not work for the 7 cal. lenght bullets.
    If your going to build a rifle for the loooong bullets then that is all you will be able to shoot. It would be a dedicated rifle. OR you can get an extra barrel and have a Switch gun set up to shoot a wider range of bullets.
    I mainly shoot the SMK's, RockyMtns, Predators and HATS when they come out. Any bullet that has a BC over .900 will be a monster down range.

    So you have to decide on what bullet your going to shoot and build the rifle around that.

    Dave
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      #46  
    Unread 02-10-2010, 11:48 PM
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    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by Black Diamond 408 View Post
    Kelly,
    I don't think you can get the best of both worlds with one twist rate. My barrel was designed so i could shoot the 350 smk and some customs longer like the 6 cal. ZA bullet, i have not shot any of these so i can't comment. Augustus stated that the 6.5 cal might need a 6.5" ending twist to stabilize it, and im pretty sure the jacketed bullet would come apart in that barrel. My barrel might work for that particular bullet, but i know it will not work for the 7 cal. lenght bullets.
    If your going to build a rifle for the loooong bullets then that is all you will be able to shoot. It would be a dedicated rifle. OR you can get an extra barrel and have a Switch gun set up to shoot a wider range of bullets.
    I mainly shoot the SMK's, RockyMtns, Predators and HATS when they come out. Any bullet that has a BC over .900 will be a monster down range.

    So you have to decide on what bullet your going to shoot and build the rifle around that.

    Dave
    Dave, thanks and I understand...I don't mind building one or the other. If you had to do all over again, would you change your twist for the "monsters". And if so, what twist would you land on for the monster of monsters (keeping in mind the monster bullet would have to have to capacity to kill ELK at long ranges).
    Perhaps this question is to early and I simply need to wait on the results of the NV shoot!!! Sorry for all the questions, my gun is going to be on hold until I come up with a twist that will handle these bullets..........

    KZ.....
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      #47  
    Unread 02-10-2010, 11:51 PM
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    Join Date: Dec 2009
    Posts: 214
    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by kellyzier View Post
    Dave, thanks and I understand...I don't mind building one or the other. If you had to do all over again, would you change your twist for the "monsters". And if so, what twist would you land on for the monster of monsters (keeping in mind the monster bullet would have to have to capacity to kill ELK at long ranges).
    Perhaps this question is to early and I simply need to wait on the results of the NV shoot!!! Sorry for all the questions, my gun is going to be on hold until I come up with a twist that will handle these bullets..........

    KZ.....

    Does anyone know if ZA, HAT, GS and Lehigh have web sites that talk about their bullets???????????????????????????????????
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      #48  
    Unread 02-11-2010, 12:10 AM
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    Join Date: May 2008
    Location: South of Canada and North of Wyoming
    Posts: 6,068
    Re: 375/408 Banded Solids Test

    Quote:
    Originally Posted by kellyzier View Post
    Does anyone know if ZA, HAT, GS and Lehigh have web sites that talk about their bullets???????????????????????????????????
    GS and Lehigh do....

    GS Custom Bullets - Designed in South Africa - Proven on the toughest game on the planet.

    Lehigh Bullets - Custom Match Bullets Homepage

    My guess is the ZA and GS bullets will dominate the shoot.
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      #49  
    Unread 02-11-2010, 12:58 AM
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    Join Date: Mar 2009
    Posts: 214
    Re: 375/408 Banded Solids Test

    Kelly,

    Neither the ZA375/7.0-W, nor the 6.5, was designed for hunting. While they are both frangible, and probably "legal", they cannot be magazine fed, nor could they be expected to penetrate in a linear fashion. More likely, you would destroy a very large amount of meat sans a perfect shot.

    The ZA375/6.0-W is suitable for taking game in my opinion, because it avoids both of those limitations.

    The Sierra seems to be right at it's design limit in an 8" twist. If your objective is to maintain compatibility with a ZA, only one question remains; Will a ZA375/6.0-W stabilize in an 8" twist. We already know the answer to that... it will. The ZA 375/6.5-W may as well. We will know that prior to the Las Vegas test.

    Best,
    Noel
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