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Post by DiamondD on Mar 12, 2018 20:17:32 GMT -5
Just got a LabRadar and took it out to clock some .327 loads from my equally new Henry Big Boy Steel 20" .327 Magnum. I also took my 5.5" Single Seven and the 4" SP101. Not knowing how much of an ordeal it was going to be to get data from the LabRadar I only brought one load, the Federal American Eagle 100 grain soft point.
Temperature was 61* F, 4,911' Elevation. Target set at 25 yards.
Series 1 was from the 20" Henry I only got 9 of the 10 shots recorded somehow. Also for whatever reason it did not record an average or the sd although it is showing the extreme spread. High was 2128, Low 2065, 63 ES.
Series 2 was 10 shots from the Single Seven. Average 1541, High 1590, Low 1431, ES 159, SD 44.9.
Series 3 10 shots from the SP101. Average 1514, High 1577, Low 1484, ES 93, SD 26.8.
Primers were flat on all brass and had sticky extraction in both revolvers. I wasn't shooting for groups but I can tell you it doesn't shoot well in any of my .327s. Don't think I will be buying any more of the AE 100s. In my opinion it is just too hot as well as being pretty dang inconsistent .
The LabRadar is very easy to use and will be getting a lot of work.
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Post by Rimfire69 on Mar 13, 2018 6:38:11 GMT -5
Nice, I've been wanting a LabRadar for some time now and haven't taken the step yet.
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Post by dave19113 on Mar 15, 2018 20:11:37 GMT -5
Nice, I've been wanting a LabRadar for some time now and haven't taken the step yet. J ust pull the trigger on it and dont look back. I was on the fence for a while until I just did it. Best investment I ever made.
In the past I would be lazy about bringing out my chrono; now its a 5 minute setup and Im gathering data.
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Post by revolvergeek on Mar 16, 2018 9:17:31 GMT -5
That 100 grn JSP AE load did the same to me in all of my .327s; flat primers, sticky/hard extraction and only fair accuracy. It just seems a bit too hot.
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Post by DiamondD on Feb 9, 2019 23:27:11 GMT -5
Nice, I've been wanting a LabRadar for some time now and haven't taken the step yet. J ust pull the trigger on it and dont look back. I was on the fence for a while until I just did it. Best investment I ever made.
In the past I would be lazy about bringing out my chrono; now its a 5 minute setup and Im gathering data.
I kind of forgot about this thread but I agree with Dave. I highly recommend the lab radar. Easy and fast enough to set up that it will go to the range with me every time. |
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cmillard
.375 Atomic
MOLON LABE
Posts: 1,943
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Post by cmillard on Feb 10, 2019 10:55:07 GMT -5
Interesting. From all of the velocity tables I have seen on the 327 in the single 7, the 5.5 inch barrel had higher velocity over the longer barreled version, which led many to believe that 5.5 was optimal. Now, a 20” barrel in 327 is still picking up the speed. My guess would be a generous barrel/cylinder gap on the long barrel single 7 which would account for the velocity loss?
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Post by Encore64 on Feb 13, 2019 19:56:30 GMT -5
Interesting. From all of the velocity tables I have seen on the 327 in the single 7, the 5.5 inch barrel had higher velocity over the longer barreled version, which led many to believe that 5.5 was optimal. Now, a 20” barrel in 327 is still picking up the speed. My guess would be a generous barrel/cylinder gap on the long barrel single 7 which would account for the velocity loss? True with some factory ammo. Remember, the cartridge was originally pimped for self defense in short barreled guns. Switching to one of the slower burning powders makes the longer barrel strut it's stuff. |
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Post by DiamondD on Feb 13, 2019 23:52:51 GMT -5
Interesting. From all of the velocity tables I have seen on the 327 in the single 7, the 5.5 inch barrel had higher velocity over the longer barreled version, which led many to believe that 5.5 was optimal. Now, a 20” barrel in 327 is still picking up the speed. My guess would be a generous barrel/cylinder gap on the long barrel single 7 which would account for the velocity loss? I'm not at home right now so don't have the data with me on the bcg of the single seven but it is not excessive. I'm actually thinking it was pretty tight. Those American Eagle 100s are running hot. No way I'm burning all the powder in that 5.5" barrel. ETA: looking back at your post I see you are saying for a 7 1/2" barrel. Not sure what is going on there. I too have seen quite a few handholds that seem to get more velocity in a 5 1/2". Really depends on the bullet powder and individual gun. I will keep testing all the loads I develop for my revolvers in my Henry also and continue to post. I've got some H&R loads now I just put together with 120 grain PB bullets and Power Pistol. I'll be shooting them in my 4 5/8" Single Six H&R Mag as well as the Henry. |
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Post by matt56 on Feb 14, 2019 17:44:17 GMT -5
You wouldn't believe how highly compressed the American Eagle 100gr JSP loads are. I pulled a bullet to see if I could tell roughly what kind of powder was needed to achieve that velocity, I dumped 14.7gr of ultra fine powder out of the case. Comparable to Accurate #9 in consistency.
I was on a velocity kick for a little while with the 327 but I quickly found out that with max velocity came poor accuracy. I also found that flat primers and sticky extraction are the norm with this caliber, at least at the top end.
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