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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm vs 7stw vs 7rum
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<blockquote data-quote="Fiftydriver" data-source="post: 223621" data-attributes="member: 10"><p>In my testing using the same barrel for each chambering and then rechambering it for the next larger round with same throat design, this is the results I got with the 160 gr Accubond loaded up until I just got a slight ejector mark on the case head.</p><p> </p><p>This was out of a Lilja 1-9 6 groove barrel, 26" finish length</p><p> </p><p>7mm Rem Mag.................3033 fps.......RL-22</p><p>7mm STW.......................3140 fps......H-1000</p><p>7mm RUM........................3264 fps......Retumbo</p><p> </p><p>I am not saying these were top end loads. I just loaded 1/2 grain up at a time until I got an ejector mark on the case head using Rem cases in all to again try to keep the variables as close as possible even though some brass is harder or softer from lot to lot.</p><p> </p><p>Again, I am not saying these are absolute max loads, that is not what I was after, I was looking to see what velocity each could when loaded to as close of chamber pressure as I could. I would say these were all good top end working loads in that barrel but there are some that are not opposed to a more noticable ejector mark and if the primer pockets hold up, so be it.</p><p> </p><p>Basically, in this test you get 107 to 124 fps increase as you step up from the Rem Mag to the Ultra Mag.</p><p> </p><p>This test is also not totally fair between all the cases, especially with the Rem Mag, why? We have to look at usible barrel length for each test. As the Rem Mag is roughly 3/8" shorter then the other two, it has a longer usible barrel length then the other two and will produce more velocity. How much more in 3/8" barrel, probably not enough to notice or pay attention to but for those purists, you know the type, this would not be a scientifically pure test.</p><p> </p><p>Kind of like using bullet drop to estimate a BC number. Even though you can hit a target from 0 to 2000 yards, it does not matter to some, its still not a correct BC for that bullet no matter how accurately you can predict down range trajectory using that value.</p><p> </p><p>Anyway, some will say the peak performance will be 200 fps over the smaller rounds. I will admit, I have seen some comparisions that were the same but when all are loaded to as similiar pressure as possible its not nearly that much. Still, 100-125 fps is a sizable increase in performance. </p><p> </p><p>Some will also say the 7mm Rem Mag offers little over the 280 Rem..... Same story, about the same 100-150 fps difference in most comparisions. Is that worth it to you, that is your call. </p><p> </p><p>What I generally look at is what the bigger cases can offer you over the smaller. Not comparing same weight bullets but what they can do with heaiver bullets. </p><p> </p><p>In the 7mm Rem Mag, the 175 gr bullets can certainly be used but in my opinion, the 160 gr bullets are the best heavy weight bullet class for this chambering. </p><p> </p><p>The STW really does well with the 175 to 180 gr class bullets as well as the 160. THe RUM really does its best, most consistant work with the 175 gr and heavier bullets such as the 180 gr Berger, 189 gr Caut. or 200 gr ULD RBBT. Thats what really makes these large cases run smoothly.</p><p> </p><p>If you look at it this way, loaded to the same velocity level, you will have a 160 gr the Rem Mag, a 180 gr in the STW and a 200 gr bullet in the RUM. WHen you look at it that way, it shows you what the real difference is.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 223621, member: 10"] In my testing using the same barrel for each chambering and then rechambering it for the next larger round with same throat design, this is the results I got with the 160 gr Accubond loaded up until I just got a slight ejector mark on the case head. This was out of a Lilja 1-9 6 groove barrel, 26" finish length 7mm Rem Mag.................3033 fps.......RL-22 7mm STW.......................3140 fps......H-1000 7mm RUM........................3264 fps......Retumbo I am not saying these were top end loads. I just loaded 1/2 grain up at a time until I got an ejector mark on the case head using Rem cases in all to again try to keep the variables as close as possible even though some brass is harder or softer from lot to lot. Again, I am not saying these are absolute max loads, that is not what I was after, I was looking to see what velocity each could when loaded to as close of chamber pressure as I could. I would say these were all good top end working loads in that barrel but there are some that are not opposed to a more noticable ejector mark and if the primer pockets hold up, so be it. Basically, in this test you get 107 to 124 fps increase as you step up from the Rem Mag to the Ultra Mag. This test is also not totally fair between all the cases, especially with the Rem Mag, why? We have to look at usible barrel length for each test. As the Rem Mag is roughly 3/8" shorter then the other two, it has a longer usible barrel length then the other two and will produce more velocity. How much more in 3/8" barrel, probably not enough to notice or pay attention to but for those purists, you know the type, this would not be a scientifically pure test. Kind of like using bullet drop to estimate a BC number. Even though you can hit a target from 0 to 2000 yards, it does not matter to some, its still not a correct BC for that bullet no matter how accurately you can predict down range trajectory using that value. Anyway, some will say the peak performance will be 200 fps over the smaller rounds. I will admit, I have seen some comparisions that were the same but when all are loaded to as similiar pressure as possible its not nearly that much. Still, 100-125 fps is a sizable increase in performance. Some will also say the 7mm Rem Mag offers little over the 280 Rem..... Same story, about the same 100-150 fps difference in most comparisions. Is that worth it to you, that is your call. What I generally look at is what the bigger cases can offer you over the smaller. Not comparing same weight bullets but what they can do with heaiver bullets. In the 7mm Rem Mag, the 175 gr bullets can certainly be used but in my opinion, the 160 gr bullets are the best heavy weight bullet class for this chambering. The STW really does well with the 175 to 180 gr class bullets as well as the 160. THe RUM really does its best, most consistant work with the 175 gr and heavier bullets such as the 180 gr Berger, 189 gr Caut. or 200 gr ULD RBBT. Thats what really makes these large cases run smoothly. If you look at it this way, loaded to the same velocity level, you will have a 160 gr the Rem Mag, a 180 gr in the STW and a 200 gr bullet in the RUM. WHen you look at it that way, it shows you what the real difference is. [/QUOTE]
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