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Posted: 1/16/2014 5:33:29 PM EDT
| im needing the min/max load data for 69g smk for 223/556. sierra seems to be the only book i dont have. the powders i have are 10X and H335 thanks |
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Isnt that what I posted? |
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Isnt that what I posted? Yes. It wasn't hot linked when you posted though...so someone must have fixed it. |
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Can you post a link on their site? I could not find it. They do have a link to .300 Blackout data recently rolled out. No, he can not. Sierra does not have their Manual on-line. They offer new cartridge data on occasion, but they do not have their manual available for free. One thing to consider when using Sierra load data is that they do not pressure test their loads. They test their loads in regular firearms and read so called "Pressure signs" like you and I do, They Guess. I take all Sierra load data with a huge grain of salt and in most cases, don't even bother looking it up. It is A Kin to asking a fellow handloader what Max is for XX bullet in XX rifle, basically worthless. |
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Steve
From the VV on line reloading manualm page 8: "By staying 5 % below the maximum powder charge weight, pressures will be reduced by about 10 % while velocities will be only about 3 % lower than listed." Then under the heading "Pressure" on same page: "There are numerous factors which can change the ballistic performance of a load even when the data is followed exactly. For example: The internal dimensions of a fi rearm can vary greatly even between two of the same make and model. Pressures can vary to extremes as different fi rearms are used. Each change in brand and even within different lots of a specifi c brand component can cause notable ballistic changes. Too, changes in ambient temperature can also cause ballistic altering pressures. Not every bullet of a given diameter and weight will produce alike pressure. Changes in case brand can also effect ballistics. There are numerous other causes of varying pressure levels. Therefore it is essential that the reloader be well versed in the methods of carefully working up a reload powder charge in small increments as outlined in the various reloading handbooks that are available from reliable sources. The data in this book is not intended for use by persons not thoroughly versed in such procedures. This guide should be supplemented by a good reloading handbook such as the Lapua Reloading Manual, the DBI Metallic Cartridge Reloading, the Vihtavuori Reloading Manual or other recognized manuals that may offer all appropriate information." I also found your interesting discourse with Bart Bobbitt and "Unclenick" and others on this topic on the Firing Line forums thread starting Sep 13. At the end of the day, just like the engineering business I am in, much comes down to judgment, and when available, experience. Many engineers are very uncomfortable with judgment, some have experience, some don't. Similar in some respects with reloaders. So we have to use published loading data carefully and follow recommended rules and best practices. While perhaps informed by a chronograph or Quickload, but unless we send our reloads out to a lab for testing, judgement and experience plays a big part in our reloading, including inspection of the fired cases. Thanks for bringing up the point of pressure in reloading manuals, it got me thinking and learning some more. Danger 6 |
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This is what I found searching online. I use this data with no problems but obviously cross check it with other sources. |
| I've used 25.0 grains of H335 with 55 grain bullets for 30 years. Back then, there weren't any 69 grain bullets. Since the 69 grain bullet came out, I've used 24.0 grains of H335 with the 69 grain bullets, which has become a fairly standard load with 68 and 69 grain bullets. Some foreign cases have smaller case capacity than American cases. |
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23.5 grains of H-335 is close to maximum with a 69 grain SMK. Velocity was around 2750 fps from my 20" test barrel. Accuracy was not up to Varget/N-140/RE-15 at slightly over 1" groups at 100 yards in my rifle. I am glad you posted that. I have been sizing and prepping a bunch of cases to do with varget and 69's but I was also going to do a batch with the H335. I will now do them all to my standard load with varget. Thanks for the info. |
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My load is 25.2 gr CFE-223 at mag length with a Tula KVB223M.
From a 20" 1:8 .223 Wylde, it'll put 5 in a nickel at 100 yards. A better shooter than I picked it up and shot 8 clothespins off the fence at 100 yards without missing a single one. Chrono said 2708, ES = 59, SD = 15.3, thrown from a Dillon PM. |
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My load is 25.2 gr CFE-223 at mag length with a Tula KVB223M. From a 20" 1:8 .223 Wylde, it'll put 5 in a nickel at 100 yards. A better shooter than I picked it up and shot 8 clothespins off the fence at 100 yards without missing a single one. Chrono said 2708, ES = 59, SD = 15.3, thrown from a Dillon PM. My load is with 25 grains CFE223 seated at mag length. Off my Hornady LNL AP. It can do 5 in .430 and 10 in .875" at 100 |
| Ditto, I use the same load, 25 gr iof AA 2520 with the 69 gr match bullet, same results, it is excellent. Won't take long for others to chime in on how its temperature sensative (so its a ball powder) and burns dirty. Ive shot that load in 20s and in the 90s, and dont have any problems, cleans up just fine. |
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Quoted: Ditto, I use the same load, 25 gr iof AA 2520 with the 69 gr match bullet, same results, it is excellent. Won't take long for others to chime in on how its temperature sensative (so its a ball powder) and burns dirty. Ive shot that load in 20s and in the 90s, and dont have any problems, cleans up just fine. |
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Quoted: My load is with 25 grains CFE223 seated at mag length. Off my Hornady LNL AP. It can do 5 in .430 and 10 in .875" at 100 Quoted: Quoted: My load is 25.2 gr CFE-223 at mag length with a Tula KVB223M. From a 20" 1:8 .223 Wylde, it'll put 5 in a nickel at 100 yards. A better shooter than I picked it up and shot 8 clothespins off the fence at 100 yards without missing a single one. Chrono said 2708, ES = 59, SD = 15.3, thrown from a Dillon PM. My load is with 25 grains CFE223 seated at mag length. Off my Hornady LNL AP. It can do 5 in .430 and 10 in .875" at 100 |
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