Ammo and Power Factor thoughts
Got a question for those that are more experienced than myself ..... Talkin 9mm ammo here only please . Given the 3 popular bullet weights for 9mm - 115, 124 , 147 . and the ruff velocity for each to...
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I have about 18 months experience with action shooting. I shoot USPSA Production, not IDPA. I just like reading your boards for the good info here. When I first started reloading, I loaded up a bunch...
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I'm torn on this. Physics tells me 125pf is 125pf is 125pf. But empirically I know they do it differently, especially depending on the powder you use. But................ then I load up a mag mixed...
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I find the FELT recoil of a 147 gr 9mm to be more comfortable than a lighter, faster bullet. Strangely enough, a 125 gr coated has less APPARENT "pop" to it than a 125 gr jacketed at the same...
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I was shooting a Extreme 115 gr plated bullet with a 4.5 gr charge of 700x . Loads are accurate from sand bags and I have a few lbs of that powder I want to use up as its a pretty good 9mm powder ....
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My M&P is challenged in the accuracy department, and 147g group best out of my gun. They also have a point of impact consistent with my non-adjustable sights. Groups open up and hit low with 115g....
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http://www.jbmballistics.com/cgi-bin/jbmpf-5.1.cgi I'm using this to determine power factor. Am I on the right track or should I use something else ?
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flymaker wrote:http://www.jbmballistics.com/cgi-bin/jbmpf-5.1.cgi I'm using this to determine power factor. Am I on the right track or should I use something else ?The only definitive way is to use a...
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I'm going to put on my Physics Major hat. Power factor is basically momentum. Which if you assume a start from rest, is force times time. Since a heavier bullet is slower to make the same power...
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I tend to enjoy shooting the 147gr loads a bit more purely because they seem softer. Ultimately how the load "feels" is not what we should focus on. Let the target tell you what to use, and how...
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For me it's more about the impulse. 147 is "easier" for me and 180 40S&W is stupid easier.
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Like Vested - I shoot lower with 115gr than I do with 124gr. Knowing the POA/POI is more important than felt recoil.
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Plato wrote:I tend to enjoy shooting the 147gr loads a bit more purely because they seem softer. Ultimately how the load "feels" is not what we should focus on. Let the target tell you what to...
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I used to shoot 124gr plated FMJ. I changed to 147gr JHP. I didn't notice any difference in recoil, but I did notice a huge increase in accuracy.
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I like the 124s. I started with 115s (cheaper) but occasionally had trouble with steel not falling after a reasonably square hit. I was going to try 147s but noticed a big (for me) difference in...
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Steve Koski wrote:Finding powder. A pipe dream.Looks like I scored 4 lbs of N320 this AM. If I hadn't been screwing around on Facebook between meetings, I would have missed it...
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Years ago when I shot CZ's almost exclusively Angus Hobdell told me that CZ shot 124/5's better than any other bullet weight. So I settled on that bullet weight. I don't shoot CZ's as much these days...
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The 124 grainers certainly should be more accurate out of the 1 - 10 twist rate of the CZ's and I know my experience supports this view. Out of my M&P's with the older 1 - 18 twist I had some...
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