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Post by shooter on Apr 23, 2011 8:46:14 GMT -5
I stuck the gun in the freezer it is loaded with 69gr n130 ccim 209 and 195 gr barens.  This load has a velocity ave around 2800fps.I will update when i get it out of the freezer and shoot it across the chrono. I have to take ten step and shoot this across the chrono.  |
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Post by dave d. on Apr 23, 2011 8:54:52 GMT -5
:)can't wait to hear the results.
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Post by shoot2reload on Apr 23, 2011 9:42:05 GMT -5
I'm looking forward to this!! Will you be checking POI change as well?
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Post by shooter on Apr 23, 2011 9:48:42 GMT -5
I'm looking forward to this!! Will you be checking POI change as well? I wont be able to test for the of POI change all i can do is run the load over the chrono to see how much speed changes.I don't really have that bigger place to shoot it.  |
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Post by Jon on Apr 23, 2011 10:52:10 GMT -5
Waiting to see results.
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Post by shooter on Apr 23, 2011 11:36:46 GMT -5
I was keeping a eye on the temp reading but it got a little colder then i would like itto be the thermoeter said -5 at that temp this load lost 260 fps i will have to try this again 10-15 degrrees and try that.  |
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Post by shoot2reload on Apr 23, 2011 11:59:28 GMT -5
Very interesting! Powder temperature sensitivity is a regular topic of discussion in centerfire rifle circles, but rarely discussed here. We always have plenty of discussions of dirty vs. clean barrels and hot vs. cold barrels, but I don't recall much talk about ambient temperature.
I think it's safe to say it's best to do any fine-tuning/sighting-in as close to hunting temperature as you can.
Thanks again!
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Post by Savage Shooter on Apr 23, 2011 12:17:46 GMT -5
At first was a bit surprised but then after really thinking thru this not a big surprise. Just keep in mind that you need to benchmark some other powders commonly used to see the difference. There is a big difference in about any chemical reaction below freezing point. There is a lot bigger difference when comparing 0 to 20 degrees vs 20 to 40 degrees. This is not exponential. In this situation I am guessing there is probably a fall off point.
I would do one more time at about 10-15 degrees to verify.
IMO we would need to see other powders like 4198 to really have a comparison. Or some of the duplex loads used regularly.
Interesting indeed.
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j1r11
8 Pointer
Posts: 178
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Post by j1r11 on Apr 23, 2011 13:23:00 GMT -5
Was this this with a frozen primer also?
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Post by Dave W on Apr 23, 2011 13:25:07 GMT -5
At first was a bit surprised but then after really thinking thru this not a big surprise. Just keep in mind that you need to benchmark some other powders commonly used to see the difference. There is a big difference in about any chemical reaction below freezing point. There is a lot bigger difference when comparing 0 to 20 degrees vs 20 to 40 degrees. This is not exponential. In this situation I am guessing there is probably a fall off point. I would do one more time at about 10-15 degrees to verify. IMO we would need to see other powders like 4198 to really have a comparison. Or some of the duplex loads used regularly. Interesting indeed. 10-20* is where I have noticed loads go to die if they are not that good. Not from the ignition side, but in accuracy and velocity. H4198 loses about 1fps per degree in my experiences sabotless from the 80's down into the teens. Never tried it below 10-15*. Very interesting test guys. |
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Post by shooter on Apr 23, 2011 14:02:21 GMT -5
I tested the 10 degree it went to 2512 fps.
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Post by dave d. on Apr 23, 2011 14:41:14 GMT -5
this is a common problem with slower powders they are just to low pressure to be stable hence duplex. I to would love to see h4198 in this test to know for sure if this test had validity. Marty thank-you for all your efforts.
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Post by shooter on Apr 23, 2011 15:15:40 GMT -5
Was this this with a frozen primer also? yes i primed the gun then put it in the freezer. |
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Post by shooter on Apr 23, 2011 15:52:35 GMT -5
59 gr H-4198 is in the freezer now this load time at 2600fps.
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Post by shooter on Apr 23, 2011 17:11:15 GMT -5
I shot the load of H-4198 59 gr it was 10 degrees and it went 2387 fps.This load usually goes 2600 fps
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Post by whyohe on Apr 23, 2011 17:22:27 GMT -5
shooter, thanks for doing this. this should really help some people.200-300 FPS does male a differance in drop and acuracy. this just goes to show you need to sight your gun in the AVERAGE temps you hunt in.
now let me throw this out, if you shoot in the summer, can/ or would you back down the bowder to match the cold speed of th hunting load to keep your POI and acuracy? i think ther still would be some difference. but do you think this could help?
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Post by shooter on Apr 23, 2011 18:12:58 GMT -5
shooter, thanks for doing this. this should really help some people.200-300 FPS does male a difference in drop and accuracy. this just goes to show you need to sight your gun in the AVERAGE temps you hunt in. now let me throw this out, if you shoot in the summer, can/ or would you back down the powder to match the cold speed of th hunting load to keep your POI and accuracy? i think their still would be some difference. but do you think this could help? I probably would make sure it was sighted in for hunting and not worry about drooping charges back cause you no what happen when it get cold out side.Remember these temp are cold. |
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Post by shooter on Apr 23, 2011 18:13:35 GMT -5
N-120 in the freezer.it coming out soon.the run around 2750 fps
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Post by shooter on Apr 23, 2011 18:37:35 GMT -5
60 N120 went 2657 fps.this powder her only lost 93 feet per sec.
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Post by Richard on Apr 23, 2011 20:07:29 GMT -5
Shooter..............Nice testing.........I wish I had access to a freezer at the range. Unfortunately I cannot do it in my yard  . How about this: a duplex of 15/55 N-110/H-322 before and after. And maybe straight 50 gr. N-110? I have shot up to 55 gr. N-110 with no adverse effects other than it did not group well. Richard |
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Post by dave d. on Apr 23, 2011 20:22:26 GMT -5
:)looks to me n120 is the clear winner. Know the only problem with the test seems to-be the velocity readings. I have shot h4198 down to 20 degrees and have only lost about 60fps from 80 degrees. So I guess at tthis point it will have to be tested in actual conditions to verify the test. Marty again thanks for your efforts.
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nic58
8 Pointer
Posts: 237
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Post by nic58 on Apr 23, 2011 20:31:06 GMT -5
Shooter, what temp did you take the N120 down to? This is some interesting info, thanks for taking the time to do it!
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Post by shooter on Apr 23, 2011 20:37:46 GMT -5
Shooter, what temp did you take the N120 down to? This is some interesting info, thanks for taking the time to do it! I got the n120 down to 10 degrees. |
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Post by shooter on Apr 23, 2011 20:41:37 GMT -5
Shooter..............Nice testing.........I wish I had access to a freezer at the range. Unfortunately I cannot do it in my yard . How about this: a duplex of 15/55 N-110/H-322 before and after. And maybe straight 50 gr. N-110? I have shot up to 55 gr. N-110 with no adverse effects other than it did not group well. Richard Richard,I am getting ready to go out of town for a couple week i may have to try that to see what happens when i get back. |
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Post by DBinNY on Apr 23, 2011 21:56:32 GMT -5
Thanks for this effort Marty. It is very interesting and relevant to those of us who hunt in these conditions.
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Post by Chris Champion on Apr 23, 2011 22:35:01 GMT -5
Great info Marty. I guess it doesn't surprise me that N120 lost the least amount of speed since it is generally considered the faster burning of the 3 powders you tested. Thanks for sharing. You just wanted another excuse to do some shooting today, didn't you. |
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. How about this: a duplex of 15/55 N-110/H-322 before and after. And maybe straight 50 gr. N-110? I have shot up to 55 gr. N-110 with no adverse effects other than it did not group well.