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Allen Mag Shooters Group
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<blockquote data-quote="41mag" data-source="post: 122937" data-attributes="member: 3804"><p>Roy,</p><p>The marks I was referring to are ranging from a slight shiny area which goes around the rim from 1/3 - 1/2 on the bottom of the case, a slight flowing into the extractor button, to some pretty nasty flowing and a definate bolt lift issue. These were things which I had to learn about in our area using the 869, and some of the loads others were using. I have since backed off to a 92.5gr load of 869 for the 169.5's and have absolutely no problems with pressures or case life. Some of the cases I am using have been loaded upwards of 8 times with this load and no loose pockets so far. This load gives me 3260 +/-fps depending on the temps at the time and groups well under MOA at all ranges I have shot it to 1150yds. </p><p></p><p>The 195gr load I have uses 94grs of 872, and is rocking along around 3150 fps. from my rifle. This is a top end load and when the temps hit above 95 degrees I start to feel some resistance in bolt lift. However, under 90 degrees it has not been an issue, even using some of the previous mentioned cases. All bullets for this rifle are seated to a base to ogive OAL. This keeps my distance from the lands at an even distance.</p><p></p><p>These loads are top end and if you use this data, please back down at least 5 grs and work up. Either of these powders will work great in this caliber and case combo, but you will have to determine your own upper limits. Mine were decided by picking a velocity and working towards it. I wanted a good velocity but didn't necessarily want to burn out the barrel in short order. I figured that mid-3200's was sufficient for anything I would be shooting, and when I hit that range, I started playing with other things. </p><p></p><p>For seating depths, I started on the lands, and worked out to .050" off. I noted in my barrel, that I increased copper fouling the further away I went. I also noted that I had passed up a node in my jumps and once I backed up some I hit the groups I was looking for. So for now, I am sitting roughly .015 off, and grouping great.</p><p></p><p>As for the bearing lengths, yes the 195's are some long puppies, and after shooting the 169.5's with the 869, that was one of the factors which leaned me towards the 872. I figured that I would get much better densities and less pressures using it. As for the sooty burn charactoristic, well it does deminish at the upper ends of the loads. With the groups I have gotten I can easily deal with it. As to the barrel heating up more with them over the others, I haven't really paid that much attention to it.</p></blockquote><p></p>
[QUOTE="41mag, post: 122937, member: 3804"] Roy, The marks I was referring to are ranging from a slight shiny area which goes around the rim from 1/3 - 1/2 on the bottom of the case, a slight flowing into the extractor button, to some pretty nasty flowing and a definate bolt lift issue. These were things which I had to learn about in our area using the 869, and some of the loads others were using. I have since backed off to a 92.5gr load of 869 for the 169.5's and have absolutely no problems with pressures or case life. Some of the cases I am using have been loaded upwards of 8 times with this load and no loose pockets so far. This load gives me 3260 +/-fps depending on the temps at the time and groups well under MOA at all ranges I have shot it to 1150yds. The 195gr load I have uses 94grs of 872, and is rocking along around 3150 fps. from my rifle. This is a top end load and when the temps hit above 95 degrees I start to feel some resistance in bolt lift. However, under 90 degrees it has not been an issue, even using some of the previous mentioned cases. All bullets for this rifle are seated to a base to ogive OAL. This keeps my distance from the lands at an even distance. These loads are top end and if you use this data, please back down at least 5 grs and work up. Either of these powders will work great in this caliber and case combo, but you will have to determine your own upper limits. Mine were decided by picking a velocity and working towards it. I wanted a good velocity but didn't necessarily want to burn out the barrel in short order. I figured that mid-3200's was sufficient for anything I would be shooting, and when I hit that range, I started playing with other things. For seating depths, I started on the lands, and worked out to .050" off. I noted in my barrel, that I increased copper fouling the further away I went. I also noted that I had passed up a node in my jumps and once I backed up some I hit the groups I was looking for. So for now, I am sitting roughly .015 off, and grouping great. As for the bearing lengths, yes the 195's are some long puppies, and after shooting the 169.5's with the 869, that was one of the factors which leaned me towards the 872. I figured that I would get much better densities and less pressures using it. As for the sooty burn charactoristic, well it does deminish at the upper ends of the loads. With the groups I have gotten I can easily deal with it. As to the barrel heating up more with them over the others, I haven't really paid that much attention to it. [/QUOTE]
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