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Post by RBinAR on Jun 30, 2005 10:17:48 GMT -5
8-)This morning’s report continues with H4198 pressure curves. Yesterday a 68-grain load was given as a starting point and today a medium and maximum load are suggested. The first of the two images at the end of the post shows traces as compiled on a load of 71-grains. As seen the pressure here reaches the 30,000psi level. This is well below that shot by 43-grains of Xmr-5744 with the same components and calibration data. It may sound strange but considering things I might now consider this the minimum load. 71 grains might sound like a lot to start but some minimum pressure seems to be a good idea for consistency reasons. This load does show a consistent performance in my rifle. The second image is also H4198 but loaded to 74-grains. I show this as a maximum but at less than 35,000psi average it is not so because of pressure concerns. It is maximum only because it’s the most that will supply consistent traces on a very hot 100-degree day. I list it as maximum also because I’d wonder if anyone really wants to shoot much more than this with a 250-grain bullet. At 2485fps there exist doubt that many people want to shoot much past 3500fpe. If they do then the recoil that goes along with it must be considered. This is one powder and one bullet weight but it is complete data provided to those who wish to use it.  i8.photobucket.com/albums/a15/dougva34/rb4198a.jpg i8.photobucket.com/albums/a15/dougva34/4198b.jpg |
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Post by edge on Jun 30, 2005 10:45:35 GMT -5
RB, Looking GREAT  I am adding links of your Traced loads in the Tips & Hints post so that as time goes by folks will be able to locate them easily. My only concern is whether you intend to keep all of your traces online. As long as you leave them up we will be able to see them, but perhaps we should also archive the traces in case that website stops their hosting?? Any thoughts? edge. |
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Post by RBinAR on Jun 30, 2005 17:26:15 GMT -5
RB, Looking GREAT I am adding links of your Traced loads in the Tips & Hints post so that as time goes by folks will be able to locate them easily. My only concern is whether you intend to keep all of your traces online. As long as you leave them up we will be able to see them, but perhaps we should also archive the traces in case that website stops their hosting?? Any thoughts? edge. Good idea as I have a habit of deleting images off my on-line carrier after the posts fall from the first page. If I didn't my image host memory allocation would have long past been exceeded. |
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Post by edge on Jun 30, 2005 17:41:03 GMT -5
I'm glad that you are ok with that My thought is that I will capture your IMG onto my harddrive AND onto another web hosting website. I will modify your post with links to those pictures and should your images be removed, then I will pull up one of the linked images.( if I am not around then someone can use the link to pull up the image ) I'll assume that this is OK unless I here from someone. If someone wants to host this data , or has a better idea, please feel free to make suggestions. RB has spent a great deal of time and money on this project and WE can't lose it!! edge. I will set up a PHOTOBUCKET album and give the password to Doug and mamaflinter should I be out of the picture ( pun intended ) |
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Post by RBinAR on Jun 30, 2005 21:17:36 GMT -5
I don't mind your process at all. This post should be named "2 down" because along with the baseline I shot for Xmr-5744 that makes two powders that I'm finished with shooting 250 grain bullets. The image of 43 grains of Xmr-5744 with a 250 grain bullet follows and like H4198 it does not represent a pressure maximum but the best that can be shot in 100 degree heat.  i8.photobucket.com/albums/a15/dougva34/5744compare.jpg |
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Post by SW on Jun 30, 2005 22:53:13 GMT -5
:)Thanks for the posts. As we've discussed, it certainly is interesting how much the pressure is with "only" 43gs of 5744 when the velocity is so meager comparatively speaking. Felt recoil certainly isn't a good way to determine internal pressure.
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Post by RBinAR on Jul 1, 2005 2:50:54 GMT -5
 :)Thanks for the posts. As we've discussed, it certainly is interesting how much the pressure is with "only" 43gs of 5744 when the velocity is so meager comparatively speaking. Felt recoil certainly isn't a good way to determine internal pressure. That's a fact Steve: A good look at the curves tells why H4198 shoots faster than 5744. Even though the 74 grain load is almost the same pressure as the 43 grain load of 5744 the amount of time H4198 stays in the useful range (above 10,000psi) is almost twice as long. 5744 stays in the useful pressure only a little more than .5ms whereas H4198 is there for 1ms or longer.
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Post by Seth B on Nov 15, 2005 8:01:58 GMT -5
Im shooting 68 grains of IMR 4198. Its shooting greating with excellent 3 and 5 shot groups. The recoil is fine for me but I am trying to get my younger brother to hunt with me. Are there any powders that will shoot around 2100-2200 fps with a 300 grain bullet that wont kick him so bad?
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Post by ma on Nov 15, 2005 8:17:02 GMT -5
Im shooting 68 grains of IMR 4198. Its shooting greating with excellent 3 and 5 shot groups. The recoil is fine for me but I am trying to get my younger brother to hunt with me. Are there any powders that will shoot around 2100-2200 fps with a 300 grain bullet that wont kick him so bad? N120 at 56 to 58 grains will do the trick just fine. |
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Post by Seth B on Nov 15, 2005 22:27:34 GMT -5
Thanks....i heard N120 is alittle more forgiving on the shoulder. What kind of speed is 56-58 grains? Maximum amount with a safe pressure or can I go up from there? Thanks again
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Post by RBinAR on Nov 16, 2005 4:08:19 GMT -5
Thanks....i heard N120 is alittle more forgiving on the shoulder. What kind of speed is 56-58 grains? Maximum amount with a safe pressure or can I go up from there? Thanks again I would like to know why it would be that N120 would be thought to have lighter recoil than other powders? One thing for sure you can go up 58 grains is nowhere near a pressure maximum even with a 300 grain bullet. Another thing I think you are comparing apples to oranges. 68 grains of H4198 shoots a 300 grain bullet closer to 2300fps (or more) than 2100fps. One final thing. If you are looking for a 2100fps load with light recoil don't stop by choosing N120 go to the factory load of 42-44 grains of N110. It will shoot to an honest 2100+fps (actually about 2200fps at maximum) with less powder and thus less recoil than N120. |
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