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Long Range Hunting & Shooting
7mm Remington Ultra Mag
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<blockquote data-quote="Fiftydriver" data-source="post: 555185" data-attributes="member: 10"><p>Liltank,</p><p> </p><p>Yes I have tested H-50BMG in the 7mm RUM and my 7mm AM. I personally do not like it in either. It is a decent burn rate but the powder is very large in size and as such, its hard to get up to a working pressure I prefer. It also increases the possibility for powder bridging.</p><p> </p><p>I have used US869 which is slightly slower burning yet and it works pretty well but as its a ball powder, it burns with more carbon fouling and is less stable over temp changes.</p><p> </p><p>With the very large 200 gr class custom bullets, this burn rate is about ideal in the 7mm AM but its a bit slow for the 7mm RUM because the cases will not support the chamber pressures needed to get a relatively clean burn on either of these powders. This is why I prefer the ball powders in this burn rate over H-50BMG as you can get much more powder in the case and get up to proper working pressures but again, you have to know these powders limitations with temp changes and keeping on top of the carbon fouling issues.</p><p> </p><p>Retumbo, with its smaller size has proven to be a very good all around performer and about the best there is in the 7mm RUM.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 555185, member: 10"] Liltank, Yes I have tested H-50BMG in the 7mm RUM and my 7mm AM. I personally do not like it in either. It is a decent burn rate but the powder is very large in size and as such, its hard to get up to a working pressure I prefer. It also increases the possibility for powder bridging. I have used US869 which is slightly slower burning yet and it works pretty well but as its a ball powder, it burns with more carbon fouling and is less stable over temp changes. With the very large 200 gr class custom bullets, this burn rate is about ideal in the 7mm AM but its a bit slow for the 7mm RUM because the cases will not support the chamber pressures needed to get a relatively clean burn on either of these powders. This is why I prefer the ball powders in this burn rate over H-50BMG as you can get much more powder in the case and get up to proper working pressures but again, you have to know these powders limitations with temp changes and keeping on top of the carbon fouling issues. Retumbo, with its smaller size has proven to be a very good all around performer and about the best there is in the 7mm RUM. [/QUOTE]
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7mm Remington Ultra Mag
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