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7mm stw with 195 berger eol
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<blockquote data-quote="willowwolfe1975" data-source="post: 1578275" data-attributes="member: 94719"><p>Thanks for the information. </p><p>I only have to go on what I was given by Berger. With that said, tomorrow I hope to start developing loads. I prepared loads in 0.5g increments from min to max on the data given for all 3 powders (Retumbo, 7977, and 7828).</p><p>Do you run your bullets long? </p><p>I was wondering about the increased powder that you use, and I took some measurements of the COAL compared to the Olgive measurement using the Hornady COAL tool. I found that the 3.760 COAL with the olgive to base measurement of 2.999 using the Berger 195 EOL is the same jump from olgive to lands as my old loads at 3.600" (168g Berger) I used in an old STW. I am thinking that the COAL from Berger represents the typical COAL of 3.600. So this is where I have started, but in my rifle the olgive touches the lands at a COAL of 3.950" and an olgive measurement of 3.188 (on my tools). I believe this added length would give significantly less pressure due to the internal ballistic changes and therefore allow for more powder to be used to create higher velocities at lesser or equal pressure.</p><p>Even with the olgive touching the lands the Berger 195 EOL leaves enough contact surface inside the neck of the cartridge that I have read is recommended for stability and accuracy (at least equal to the calibre).</p><p>With this in mind I had expected that when I get an initially accurate charge and then start moving the bullet length toward the lands I will likely find that I can use heavier charges and gain velocity safely.</p><p>So I think that the powder charges and velocities that you have are very reasonable to expect as I move toward the upper ends of load development; at least I really hope so. At this time I don't have a chronograph so my eventual max loads will be based on pressure signs alone.</p><p></p><p>However, I also tend to back off the max loads I develop in the winter due to increased pressures in the summer. Currently we are in the -35C range outside. Summer of course is the typical 20-30+C giving a temp swing of around 60 degrees. I still haven't had the nerve to pull the trigger on a winter load in the summertime! Not sure I ever will!</p><p></p><p>Thanks again for the info, and please any other info/advice would be greatly appreciated.</p></blockquote><p></p>
[QUOTE="willowwolfe1975, post: 1578275, member: 94719"] Thanks for the information. I only have to go on what I was given by Berger. With that said, tomorrow I hope to start developing loads. I prepared loads in 0.5g increments from min to max on the data given for all 3 powders (Retumbo, 7977, and 7828). Do you run your bullets long? I was wondering about the increased powder that you use, and I took some measurements of the COAL compared to the Olgive measurement using the Hornady COAL tool. I found that the 3.760 COAL with the olgive to base measurement of 2.999 using the Berger 195 EOL is the same jump from olgive to lands as my old loads at 3.600" (168g Berger) I used in an old STW. I am thinking that the COAL from Berger represents the typical COAL of 3.600. So this is where I have started, but in my rifle the olgive touches the lands at a COAL of 3.950" and an olgive measurement of 3.188 (on my tools). I believe this added length would give significantly less pressure due to the internal ballistic changes and therefore allow for more powder to be used to create higher velocities at lesser or equal pressure. Even with the olgive touching the lands the Berger 195 EOL leaves enough contact surface inside the neck of the cartridge that I have read is recommended for stability and accuracy (at least equal to the calibre). With this in mind I had expected that when I get an initially accurate charge and then start moving the bullet length toward the lands I will likely find that I can use heavier charges and gain velocity safely. So I think that the powder charges and velocities that you have are very reasonable to expect as I move toward the upper ends of load development; at least I really hope so. At this time I don't have a chronograph so my eventual max loads will be based on pressure signs alone. However, I also tend to back off the max loads I develop in the winter due to increased pressures in the summer. Currently we are in the -35C range outside. Summer of course is the typical 20-30+C giving a temp swing of around 60 degrees. I still haven't had the nerve to pull the trigger on a winter load in the summertime! Not sure I ever will! Thanks again for the info, and please any other info/advice would be greatly appreciated. [/QUOTE]
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