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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Throat erosion and double-based powders.
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<blockquote data-quote="hypersonic" data-source="post: 635327" data-attributes="member: 5217"><p>Thats a pretty wide blanket statement without having used 25 in a 7Rum or other powders in a close burn range like H-1000, Retumbo or others. Rl-25 is not as temp stable as other powders and depending on your temps shooting dirtpigs versus your temps when you are deer hunting you could see a loss of 200 fps from summer to fall seasons. To say that other powders can't match the performance with your intended cartridge/ platform and bullet choice is not quite accurate. The rifle you are planning on bulding is going to dictate what powder is going to work the best with your chosen components. Here is a case in point with powder selection for 7RM. Worked up a load last year for my best friends 7RM using 150 Etips. Any powders that had proven to be excellent in the past with bullets in the 150-160 grain class did not pan out. Either accuracy was non existant or pressure was getting out of hand when accuracy was starting to form up. Went way out in left field on powder choice with Retumbo and " bing bang boom" got the accuracy and suprising speed without pressure issues. Yes the Etip is a different animal compared to a lead core bullet or a pure copper bullet for that matter on how they make pressure so it took a bit more work to get dialed in, but the desired results were achieved in a detailed and safe manner. To limit yourself to one powder is not the way to go when trying to find a load even if your chosen cartridge has a reduced barrel life because of cartridge capacity versus bore size. What is your intended barrel length for your 7 Rum build? as I see you have posted that you will be getting 3950 fps with the 120 Btip over 96.5 grains of Rl-25. I am not going to say anymore till you give a bit more info on barrel length and where your current velocity information has come from.</p></blockquote><p></p>
[QUOTE="hypersonic, post: 635327, member: 5217"] Thats a pretty wide blanket statement without having used 25 in a 7Rum or other powders in a close burn range like H-1000, Retumbo or others. Rl-25 is not as temp stable as other powders and depending on your temps shooting dirtpigs versus your temps when you are deer hunting you could see a loss of 200 fps from summer to fall seasons. To say that other powders can't match the performance with your intended cartridge/ platform and bullet choice is not quite accurate. The rifle you are planning on bulding is going to dictate what powder is going to work the best with your chosen components. Here is a case in point with powder selection for 7RM. Worked up a load last year for my best friends 7RM using 150 Etips. Any powders that had proven to be excellent in the past with bullets in the 150-160 grain class did not pan out. Either accuracy was non existant or pressure was getting out of hand when accuracy was starting to form up. Went way out in left field on powder choice with Retumbo and " bing bang boom" got the accuracy and suprising speed without pressure issues. Yes the Etip is a different animal compared to a lead core bullet or a pure copper bullet for that matter on how they make pressure so it took a bit more work to get dialed in, but the desired results were achieved in a detailed and safe manner. To limit yourself to one powder is not the way to go when trying to find a load even if your chosen cartridge has a reduced barrel life because of cartridge capacity versus bore size. What is your intended barrel length for your 7 Rum build? as I see you have posted that you will be getting 3950 fps with the 120 Btip over 96.5 grains of Rl-25. I am not going to say anymore till you give a bit more info on barrel length and where your current velocity information has come from. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Throat erosion and double-based powders.
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