Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Using Vihta Vuori Oy powders in the big overbore cartridges
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="brianwinzor" data-source="post: 96746" data-attributes="member: 1067"><p>JKO, I have only used Vihtavouri N170, as the Oz agents so far haven't imported the 2 slower burning powders 20N29, &amp; 24N42.</p><p></p><p>I have not used N170 in a large cased big bore, only in my 25/06 AI with the 142 and 156 grain Wildcats. I have listed below my chrono results which will give you an idea of the burning rate in relationship to H870, AR2225 (HRetumbo in US), and Re 25. </p><p></p><p>25/06AI - Wildcat 142 grain ULD</p><p>57.0 Re25 2927 Normal Pressure</p><p>58.0 Re25 3011 Near Maximum Pressure</p><p>59.0 Re25 3042 Max Pressure, 95%load density.</p><p></p><p>60.0 AR2225 2914 Normal Pressure</p><p>61.0 AR2225 2986 Near Maximum Pressure,</p><p>62.0 AR2225 3039 Max Pressure, 100% loading density</p><p></p><p>61.0 VihN170 2928 Normal pressure</p><p>62.0 VihN170 3020 Near Maximum Pressure</p><p>63.0 VihN170 3096 Max Pressure, compressed load</p><p></p><p>64.0 H870 2953 Near Maximum Pressure</p><p>65.0 H870 3018 Max Pressure, 99% loading density</p><p></p><p>Nb: bullet did not stabilise due to 1 in 10 twist. </p><p>25/06AI - Wildcat 156 grain ULD</p><p>57.0 AR2225 2782 Near Maximum Pressure</p><p>58.0 AR2225 2810 Max Pressure, 95% loading density.</p><p></p><p>57.0 VihN170 2700 Normal pressure</p><p>58.0 VihN170 2773 Near Maximum Pressure</p><p>59.0 VihN170 2820 Max Pressure, 97% loading density.</p><p></p><p>60.0 H870 2705 Normal Pressure</p><p>61.0 H870 2725 Normal Pressure</p><p>62.0 H870 2771 Near Maximum Pressure</p><p>63.0 H870 2832 Max Pressure, 99% loading density</p><p></p><p>Nb: bullet did not stabilise due to 1 in 10 twist. </p><p>So far I have only used VihtN170 in the 25/06AI, with the 115NBT, 130, 142, and 156 UlD Wildcats, and pressure build up was commensurate with the load increase, and it certainly did not appear spiky. I did not notice that it left any more fouling than the other powders in the test. </p><p></p><p>So far in limited testing of this powder, accuracy has been acceptable without being outstanding. However, further testing in a soon to be built 224 Clark, and 25/7mm Dakota, will give me a better idea of Vihtavouri N170. Hope that the above is of some help. Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 96746, member: 1067"] JKO, I have only used Vihtavouri N170, as the Oz agents so far haven't imported the 2 slower burning powders 20N29, & 24N42. I have not used N170 in a large cased big bore, only in my 25/06 AI with the 142 and 156 grain Wildcats. I have listed below my chrono results which will give you an idea of the burning rate in relationship to H870, AR2225 (HRetumbo in US), and Re 25. 25/06AI - Wildcat 142 grain ULD 57.0 Re25 2927 Normal Pressure 58.0 Re25 3011 Near Maximum Pressure 59.0 Re25 3042 Max Pressure, 95%load density. 60.0 AR2225 2914 Normal Pressure 61.0 AR2225 2986 Near Maximum Pressure, 62.0 AR2225 3039 Max Pressure, 100% loading density 61.0 VihN170 2928 Normal pressure 62.0 VihN170 3020 Near Maximum Pressure 63.0 VihN170 3096 Max Pressure, compressed load 64.0 H870 2953 Near Maximum Pressure 65.0 H870 3018 Max Pressure, 99% loading density Nb: bullet did not stabilise due to 1 in 10 twist. 25/06AI - Wildcat 156 grain ULD 57.0 AR2225 2782 Near Maximum Pressure 58.0 AR2225 2810 Max Pressure, 95% loading density. 57.0 VihN170 2700 Normal pressure 58.0 VihN170 2773 Near Maximum Pressure 59.0 VihN170 2820 Max Pressure, 97% loading density. 60.0 H870 2705 Normal Pressure 61.0 H870 2725 Normal Pressure 62.0 H870 2771 Near Maximum Pressure 63.0 H870 2832 Max Pressure, 99% loading density Nb: bullet did not stabilise due to 1 in 10 twist. So far I have only used VihtN170 in the 25/06AI, with the 115NBT, 130, 142, and 156 UlD Wildcats, and pressure build up was commensurate with the load increase, and it certainly did not appear spiky. I did not notice that it left any more fouling than the other powders in the test. So far in limited testing of this powder, accuracy has been acceptable without being outstanding. However, further testing in a soon to be built 224 Clark, and 25/7mm Dakota, will give me a better idea of Vihtavouri N170. Hope that the above is of some help. Brian. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Using Vihta Vuori Oy powders in the big overbore cartridges
Top