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  #11  
Old 08-07-2019, 11:48 PM
TinMan TinMan is offline
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Don't have a 17HH, but based on what you said, I would shoot it, and be very careful to check again when you have to change powder lot numbers to make sure.
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  #12  
Old 08-08-2019, 03:04 AM
orkan orkan is offline
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Quote:
Originally Posted by coyotezapper View Post
I would say the 15.5 bullet should have a shorter bearing surface and also less pressure.
I'm pretty sure the bearing surface is longer, as the 15.5 is quite long for its weight.
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  #13  
Old 08-08-2019, 04:40 AM
coyotezapper coyotezapper is offline
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Quote:
Originally Posted by orkan View Post
I'm pretty sure the bearing surface is longer, as the 15.5 is quite long for its weight.
15.5 NTX bc is .115
17 Vmax is .125
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  #14  
Old 08-08-2019, 03:08 PM
orkan orkan is offline
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Quote:
Originally Posted by coyotezapper View Post
15.5 NTX bc is .115
17 Vmax is .125
BC does not directly correlate to bearing surface.

If the bearing surface is that much longer than the 20gr... I sincerely doubt its shorter than the 17gr, as you previously stated.


Last edited by orkan; 08-08-2019 at 03:11 PM.
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  #15  
Old 08-08-2019, 04:16 PM
B23 B23 is offline
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Quote:
Originally Posted by orkan View Post
BC does not directly correlate to bearing surface.

If the bearing surface is that much longer than the 20gr... I sincerely doubt its shorter than the 17gr, as you previously stated.

Hey Greg, that bullet in the middle looks like the 17gr Vmax bullet that they use in the 17 HMR rimfire ammo, whatever it is, it's definitely not a 20gr Vmax.

I just went and measured, bullet OAL as well as bearing surface, for a 15.5gr NTX, 17gr Vmax, 20gr Vmax, and 25gr Vmax.

15gr LF (OAL .579) (bearing surface .267) flat base bullet and is the bullet used in the 17 WSM rimfire ammo

15.5gr NTX (OAL .585) (bearing surface .274) boat tail bullet

17gr Vmax (OAL .533) (bearing surface .218) boat tail bullet and is the bullet used in the 17 HMR rimfire ammo

20gr Vmax (OAL .596) (bearing surface .281) flat base bullet

25gr Vmax (OAL .666) (bearing surface .360) flat base bullet

Last edited by B23; 08-08-2019 at 05:47 PM.
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  #16  
Old 08-08-2019, 05:14 PM
coyotezapper coyotezapper is offline
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Quote:
Originally Posted by orkan View Post
BC does not directly correlate to bearing surface.

If the bearing surface is that much longer than the 20gr... I sincerely doubt its shorter than the 17gr, as you previously stated.

I listed the bc's only to point out how close they were to each other. I'm still of the opinion that load data for the 17 can be used safely with the 15.5.
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  #17  
Old 08-08-2019, 05:15 PM
coyotezapper coyotezapper is offline
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[quote=coyotezapper;283850]I listed the bc's only to point out how close they were to each other. I'm still of the opinion that load data for the 17 can be used safely with the 15.5.[/
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  #18  
Old 08-08-2019, 05:18 PM
coyotezapper coyotezapper is offline
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Quote:
Originally Posted by B23 View Post
Hey Greg, that bullet in the middle looks like the 17gr Vmax bullet that they use in the 17 HMR rimfire ammo, whatever it is, it's definitely not a 20gr Vmax.

I just went and measured, bullet OAL as well as bearing surface, for a 15.5gr NTX, 17gr Vmax, 20gr Vmax, and 25gr Vmax.

15.5gr NTX (OAL .585) (bearing surface .274) boat tail bullet

17gr Vmax (OAL .533) (bearing surface .218) boat tail bullet

20gr Vmax (OAL .596) (bearing surface .281) flat base bullet

25gr Vmax (OAL .666) (bearing surface .360) flat base bullet
Good info here, thanks!!
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  #19  
Old 08-08-2019, 05:43 PM
B23 B23 is offline
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And if the whole .17 cal Hornady bullets weren't confusing enough, I just went and pulled a bullet from a piece of 15gr lead free 17 WSM ammo.

I always kind of assumed these 15gr lead free bullets in the 17 WSM ammo were either the same or just a .5gr lighter version of the 15.5gr NTX they use in the 17 Hornet ammo, well, that would be an incorrect assumption because they are definitely NOT the same bullet. The 15gr LF bullet loaded in the 17 WSM ammo is a flat base bullet, not a BT bullet like they use in the 17 Hornet.


If anyone cares to know, the measurements of this bullet are as follows.

15gr lead free (OAL .579) (bearing surface .267) flat base bullet
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  #20  
Old 08-08-2019, 05:57 PM
coyotezapper coyotezapper is offline
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Quote:
Originally Posted by B23 View Post
Hey Greg, that bullet in the middle looks like the 17gr Vmax bullet that they use in the 17 HMR rimfire ammo, whatever it is, it's definitely not a 20gr Vmax.

I just went and measured, bullet OAL as well as bearing surface, for a 15.5gr NTX, 17gr Vmax, 20gr Vmax, and 25gr Vmax.

15gr LF (OAL .579) (bearing surface .267) flat base bullet and is the bullet used in the 17 WSM rimfire ammo

15.5gr NTX (OAL .585) (bearing surface .274) boat tail bullet

17gr Vmax (OAL .533) (bearing surface .218) boat tail bullet and is the bullet used in the 17 HMR rimfire ammo

20gr Vmax (OAL .596) (bearing surface .281) flat base bullet

25gr Vmax (OAL .666) (bearing surface .360) flat base bullet
Ok, so I went to QL and created/modified a bullet to the dimensions that B23 provided for us and the 15.5 NTX will create 2700ish more psi than the standard 17 vmax. I would have thought that the increased bearing surface would have more effect but it didn't.

Last edited by coyotezapper; 08-08-2019 at 06:06 PM. Reason: correction
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