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Rifles, Reloading, Optics, Equipment
Reloading
Who's successfuly using imr 8133?
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<blockquote data-quote="Roughwater" data-source="post: 1625470" data-attributes="member: 33915"><p>I did a ladder test yesterday using a 7mm rem mag, IMR8133, 143 gn hammer hunters, 215M primers and New Winchester brass. The brass I weight sorted so less than 1 grain spread, Neck sized only. Cases were trimmed within 002 of the recommended trim length. I used a forster long tube funnel to help compress the powder as 77 gn otherwise would be halfway up the neck of the case. I previously loaded up one round at 76.5 gn of 8133 to get some idea of where to begin and where to end the ladder test. 76.5 gn got me 3304 FPS across the magnetospeed. I then loaded 7 rounds in .3 gn increments starting at 75.5 gn up to 77.2 gn (the last round I just went up .2 gn). Hodgdon load data website says 78 gn is a max load for a 140 gn bullet, but this is actually a 145 gn bullet or nearly so anyway. (The test bullet I initially loaded of 76.5 gn showed a little flattening of the primer but otherwise no signs of pressure. Just to be sure before loading any more rounds I removed the primer from the fired case and installed a new primer and it installed normally with no sign of being loose so I assumed I could increase that load slightly without overpressure. After firing all rounds I noticed however that the scope had moved forwad on me at least a quarter inch which I don't imagine helped with accuracy in determing potential nodes. </p><p></p><p>In vewing the bullet hole locations in relation to the velocities I felt there could be a accuracy node at 75.7 gn and 76.8 gn. I based that on the fact that bullets 1&2 and bullets 5&6 were either touching or nearly so in both cases and the ES between both were very, very low. Especially between 1&2. Oh yes, All velocities were measured with the magnetospeed sport. For what it's worth the scope on it is a Nikon Monarch 5, 3-15X44 with the balistic reticle. </p><p></p><p>Here are the numbers:</p><p>1. 75.5 gn = 3287 FPS</p><p>2. 75.8gn = 3285</p><p>3. 76.1 gn =3306</p><p>4. 76.4 gn = 3330</p><p>5. 76.7 gn = 3331</p><p>6. 77 gn = 3339</p><p>7. 77.2 gn = 3342</p><p></p><p>[ATTACH=full]132132[/ATTACH] </p><p></p><p>Read more: <a href="http://hammerbullets.boards.net/thread/448/remington-magnum-hammer-bullet-elk?page=2#ixzz5mOBtGfXK" target="_blank">http://hammerbullets.boards.net/thread/448/remington-magnum-hammer-bullet-elk?page=2#ixzz5mOBtGfXK</a></p></blockquote><p></p>
[QUOTE="Roughwater, post: 1625470, member: 33915"] I did a ladder test yesterday using a 7mm rem mag, IMR8133, 143 gn hammer hunters, 215M primers and New Winchester brass. The brass I weight sorted so less than 1 grain spread, Neck sized only. Cases were trimmed within 002 of the recommended trim length. I used a forster long tube funnel to help compress the powder as 77 gn otherwise would be halfway up the neck of the case. I previously loaded up one round at 76.5 gn of 8133 to get some idea of where to begin and where to end the ladder test. 76.5 gn got me 3304 FPS across the magnetospeed. I then loaded 7 rounds in .3 gn increments starting at 75.5 gn up to 77.2 gn (the last round I just went up .2 gn). Hodgdon load data website says 78 gn is a max load for a 140 gn bullet, but this is actually a 145 gn bullet or nearly so anyway. (The test bullet I initially loaded of 76.5 gn showed a little flattening of the primer but otherwise no signs of pressure. Just to be sure before loading any more rounds I removed the primer from the fired case and installed a new primer and it installed normally with no sign of being loose so I assumed I could increase that load slightly without overpressure. After firing all rounds I noticed however that the scope had moved forwad on me at least a quarter inch which I don't imagine helped with accuracy in determing potential nodes. In vewing the bullet hole locations in relation to the velocities I felt there could be a accuracy node at 75.7 gn and 76.8 gn. I based that on the fact that bullets 1&2 and bullets 5&6 were either touching or nearly so in both cases and the ES between both were very, very low. Especially between 1&2. Oh yes, All velocities were measured with the magnetospeed sport. For what it's worth the scope on it is a Nikon Monarch 5, 3-15X44 with the balistic reticle. Here are the numbers: 1. 75.5 gn = 3287 FPS 2. 75.8gn = 3285 3. 76.1 gn =3306 4. 76.4 gn = 3330 5. 76.7 gn = 3331 6. 77 gn = 3339 7. 77.2 gn = 3342 [ATTACH=full]132132[/ATTACH] Read more: [URL]http://hammerbullets.boards.net/thread/448/remington-magnum-hammer-bullet-elk?page=2#ixzz5mOBtGfXK[/URL] [/QUOTE]
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