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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Rem Mag | 168gr Accubond Long Range | Reloder-25
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<blockquote data-quote="coyotezapper" data-source="post: 1726503" data-attributes="member: 20438"><p>Here are my steps in developing a load. This goes without saying but I'm going to say it anyway, start with a clean barrel. And I mean clean - to the metal, no carbon or copper at all.</p><p>1. Pick bullet that will work with my barrels twist rate.</p><p>2. Pick powder that will work with selected bullet and cartridge. IMO this is the most important step. Just because a powder or bullet manufacturer says it will work does not make it the ideal powder choice. This step requires a lot of research and most of the internet info is BS. The IDEAL powder will make the rest of the process easy.</p><p>3. Load cartridge to magazine length and measure jump to lands. This is for reference only and is used for throat measurements down the road. Save bullet used for this step. I keep mine stored with the dies.</p><p>4. Determine starting powder charge and max. Use reloading manual or Quickload to determine these charges. Using some charge from the internet / forum is not wise.</p><p>5. With a good bench set up and chrono shoot loads paying attention to velocity. Velocity=pressure. If you exceed book velocity stop. Pressure signs on brass occur long after pressure becomes excessive. If you don't have a chrono then you will have to pay attention to pressure signs on brass and once seen back off a grain or two. This testing can be done at 100 yards with a chrono but if you don't have a chrono its best to do this testing at distance no further than 300 yards is needed. It is important to replicate each rifle bag set up for each shot when shooting at distance. You will be looking for consistent POI and an inconsistent set up will cause your results to be skewed. I shoot three shots of each charge documenting velocity, ES and SD's for each charge. If shooting at distance you will need to log your POI for each shot. If this means walking out and marking each shot then do it. With a good spotter you can do this at the bench and just take a blank target and transfer the POI holes to the blank target.</p><p>5a. This is the most important part of load development IMO. What you are looking for here is a velocity flat spot in the powder charge increase. Example would be 60, 60.2 and 60.4 all have the same or close to the same velocity. This is a velocity flat spot. If no chrono then these three charges should show the same POI at 300 yards indicating the same velocity. This can be done at 100 yards but is a lot easier at 300 but at 300 your shooting, wind and bench set up become the weak link and can affect POI. Once velocity flat spot is found load to the middle of it and do seating depth testing. In some cases no seating depth testing is needed but I wouldn't count on this to be the case.</p><p></p><p>For the 162 ELDX I would recommend H4831 regular or SC - regular has a better fill but either will work. Max safe velocity will be 2950-3000 fps with a 24.4"" bbl.</p><p></p><p>This thread may help you with evaluating groups at 100 yards if you have no chrono.</p><p></p><p><a href="http://forum.accurateshooter.com/threads/long-range-load-development-at-100-yards.3814361/" target="_blank">http://forum.accurateshooter.com/threads/long-range-load-development-at-100-yards.3814361/</a></p></blockquote><p></p>
[QUOTE="coyotezapper, post: 1726503, member: 20438"] Here are my steps in developing a load. This goes without saying but I'm going to say it anyway, start with a clean barrel. And I mean clean - to the metal, no carbon or copper at all. 1. Pick bullet that will work with my barrels twist rate. 2. Pick powder that will work with selected bullet and cartridge. IMO this is the most important step. Just because a powder or bullet manufacturer says it will work does not make it the ideal powder choice. This step requires a lot of research and most of the internet info is BS. The IDEAL powder will make the rest of the process easy. 3. Load cartridge to magazine length and measure jump to lands. This is for reference only and is used for throat measurements down the road. Save bullet used for this step. I keep mine stored with the dies. 4. Determine starting powder charge and max. Use reloading manual or Quickload to determine these charges. Using some charge from the internet / forum is not wise. 5. With a good bench set up and chrono shoot loads paying attention to velocity. Velocity=pressure. If you exceed book velocity stop. Pressure signs on brass occur long after pressure becomes excessive. If you don't have a chrono then you will have to pay attention to pressure signs on brass and once seen back off a grain or two. This testing can be done at 100 yards with a chrono but if you don't have a chrono its best to do this testing at distance no further than 300 yards is needed. It is important to replicate each rifle bag set up for each shot when shooting at distance. You will be looking for consistent POI and an inconsistent set up will cause your results to be skewed. I shoot three shots of each charge documenting velocity, ES and SD's for each charge. If shooting at distance you will need to log your POI for each shot. If this means walking out and marking each shot then do it. With a good spotter you can do this at the bench and just take a blank target and transfer the POI holes to the blank target. 5a. This is the most important part of load development IMO. What you are looking for here is a velocity flat spot in the powder charge increase. Example would be 60, 60.2 and 60.4 all have the same or close to the same velocity. This is a velocity flat spot. If no chrono then these three charges should show the same POI at 300 yards indicating the same velocity. This can be done at 100 yards but is a lot easier at 300 but at 300 your shooting, wind and bench set up become the weak link and can affect POI. Once velocity flat spot is found load to the middle of it and do seating depth testing. In some cases no seating depth testing is needed but I wouldn't count on this to be the case. For the 162 ELDX I would recommend H4831 regular or SC - regular has a better fill but either will work. Max safe velocity will be 2950-3000 fps with a 24.4"" bbl. This thread may help you with evaluating groups at 100 yards if you have no chrono. [URL]http://forum.accurateshooter.com/threads/long-range-load-development-at-100-yards.3814361/[/URL] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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7mm Rem Mag | 168gr Accubond Long Range | Reloder-25
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