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Post by Richard on Jan 3, 2011 20:44:33 GMT -5
TRACES CAN BE FOUND BY FOLLOWING THIS LINKI know some of the traces do not show the number on the top. The reason is I also include the load and being Triplex, the administrators do not want that information shown. So, it gets a bit confusing when I pull up the pictures from Photobucket. Just refer to my work sheet and compare the velocities and pressures on the ones with no heading. I would hope this could change soon as its a pain in the arse skirting around the numbers. Richard
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Post by edge on Jan 3, 2011 21:02:20 GMT -5
Personally I think that the pressures are unreasonably low, but they are clearly apples to apples as far as the loads are concerned.
I see no reason to not show the triplex loads as long as they come with a PT.
edge.
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Post by Richard on Jan 3, 2011 21:26:42 GMT -5
Edge.........I was hoping you would feel that way. It makes it so much easier for me to relate information and compare loads.
That being said............The object of todays tests were to show the velocity and pressures for the three powders used in the Triplex I was going to shoot. By looking at a total of 55 gr. for each load, a logical comparison could be drawn. The powders used were N-110, N-120 and N-130. I then put together a duplex using 10 gr. of N-110, 20 gr. of N-120 and 25 gr. of N-130 so I again was using a total of 55 grains. The highest pressure came from the straight N-110. The triplex was much lower. Then to make sure that an accidental mixing of the powders did not cause a problem, I pre-mixed the triplex load and as you can see, no bad effects.
At this point, I am not really advocating a triplex load? I just wanted to try it and see for myself if there was any merit in it? I got some good results, but not any better than single and duplex loads. I think, at least in my mind, that I dispelled any danger in triplexing provided common sense is used. And the same goes for duplexing or using too much of quick single powder. Common sense is the key factor in safety.
Richard
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Post by ET on Jan 3, 2011 22:19:02 GMT -5
Richard
Your efforts are appreciated and helpful in more ways than you believe.
As for your concern for the single T 5b I don’t believe the bullet is anywhere near the barrel end.
You have to keep in mind the bottom of the graph represents time and not bore distance.
Once the unit is triggered to record it will show what occurs in a selected/given time frame only. Here I see that an ignition delay has occurred when the unit was triggered. Of course I don’t believe this is a desirable occurrence.
What caught my eye is that 55gr of N110 in a .45 produced a pressure around 36,000PSI for a 200gr bullet/sabot load. Right off the bat my imposed limit of 50gr 4759 behind such a load in a .50 should appear anemic when I trace it. As I don’t have a sheltered area to test in I’ll just have to wait till Spring to find out.
Again Thanks for your effort to provide such information.
Ed
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Post by pposey on Jan 3, 2011 22:32:51 GMT -5
Thats some cool stuff man you are doing good work
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Post by Richard on Jan 4, 2011 15:53:26 GMT -5
ET................After I thought about it, I realized I had a very similar trace occur last week. After getting a similar trace with the 64 gr. H-4198 load I was convinced the Triplex was not the cause. But do note, that shot printed right in the groups I shot a little later and the pressure was right there with the others so I don't see it affecting accuracy?  By the way, I have redone those photo's with the "missing" headings and also my work sheet. I sent them to Edge who will post them when he gets home from work. Do NOTE on the new photos that I mistakenly printed T-5a  It is actually T-5b just to clarify. Too much trouble to re-edit the trace  I think what I was most impressed by yesterday was the difference in pressure between the straight 55 gr. N-110 and the duplex. Almost the same velocity and at 6,000psi less pressure  Richard |
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Post by ET on Jan 4, 2011 17:20:30 GMT -5
I think what I was most impressed by yesterday was the difference in pressure between the straight 55 gr. N-110 and the duplex. Almost the same velocity and at 6,000psi less pressure Richard Richard Your traces obviously show what is said about the duplex producing higher velocities with equal too or less pressure. Having the right ratio of powders is the key for that desired controlled burn. What is nice is seeing the result on the graphs instead of blindly trying to picture what is happening. Ed |
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Post by Richard on Jan 5, 2011 16:37:52 GMT -5
Note: On trace T-5 I had inadvertently put an "a" after the five.........it should have be a "b". I just sent Edge a new picture to correct it.
Should have some good comparisons next week.
Richard
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Post by deadon on Jan 5, 2011 17:38:40 GMT -5
Note: On trace T-5 I had inadvertently put an "a" after the five.........it should have be a "b". I just sent Edge a new picture to correct it. Should have some good comparisons next week. Richard Most of this is waaaaay over my head but I am learning and I am sure we will all profit from your efforts, Thank you Richard and also Jon for caring enough to fund the test. Rusty |
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Post by skennedy on Jan 6, 2011 18:42:33 GMT -5
Duples,triplex,traces, all I can say is I have brain overload. This is all great info keep it up.Thanks Richard
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Post by Richard on Jan 6, 2011 19:00:11 GMT -5
 Richard
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Post by Chris Champion on Jan 10, 2011 17:17:28 GMT -5
Richard, I asked on another post who shot 55g of N110 in the 45 and I see it was you. Should have known  Just curious. Did you happen to look at your sabots with the 55g N110 loads? I can't imagine not blowing a sabot with that much N110 in the 45cal especially since about 44g seems about the limit in the 50 cal for most people. Were there any signs of high pressure with this load (ie bulged primers, etc)? |
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Post by Richard on Jan 10, 2011 19:53:16 GMT -5
Chris.......I obviously shot a group, so no blown sabot??? With the amount of sabots out in front of my shooting bench, you would be hard pressed to find any particular one ;D.
Richard
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It is actually T-5b just to clarify. Too much trouble to re-edit the trace 
