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Posted: 12/11/2013 12:35:25 PM EDT
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I have been working on a new .45 load since I was able to stop by the Xtreme bullets plant and pick up some nice plated bullets recently. I have always wondered what difference the LP or SP brass made on the loads, so I ran some across the chronograph last week to find out. The results are below. Everything was loaded on a Lee Pro1000 all I changed was the priming setup and settled on an in-between OAL after testing my LP loads. It was -2* when I tested the LP loads, but I kept the magazines in the truck until I was ready for them. The SP loads were tested when it was about 2 above, the ammo was kept in the truck then as well. All of the numbers are from a CED ProChrono Digital. I also shot a couple of other loads just to have somewhat of a baseline since this is the first time I've checked my pistol rounds.
My conclusion, SP or LP doesn't matter much for this load although I prefer LP. Zero 180gr. HP - 1.120" 9.2 Gr. AA#5 Rem LP Primers 959 AVG977 1030 ES108 984 SD39 973 933 987 1031 923 Hornady Critical Defense 882 AVG889 887 ES143 879 SD47 864 1004 862 880 861 Xtreme 230gr. RN - 1.230" 6.0 Gr. Unique Rem LP Primers 797 AVG787 764 ES65 787 SD20 804 819 788 787 754 Xtreme 230gr. RN - 1.240" 6.0 Gr. Unique Rem LP Primers 754 AVG764 814 ES99 715 SD28 748 773 768 779 767 Xtreme 230gr. RN - 1.235" 6.0 Gr. Unique Rem LP Primers 850 AVG795 826 ES78 785 SD30 772 785 778 773 Xtreme 230gr. RN - 1.235" 6.0 Gr. Unique Rem SP Primers 775 AVG794 789 ES67 769 SD22 812 836 809 787 781 Xtreme 230gr. RN - 1.235" 6.0 Gr. Unique Rem SP Primers 764 AVG790 725 ES111 836 SD36 808 804 773 783 828 Hornady Critical Defense 1024 890 900 873 |
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I have done this and played with FC brass(LP) and other brands whose flash hole was smaller than the FC cases. It really doesn,t seem to make any difference, even when using several different powders, velocity is really close. Interestingly, accuracy differences did show up on paper. The edge seemed to go the small primer cases, a small edge, but it was a fun few days shooting and testing. I'm over it now :)
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Quoted:
I have done this and played with FC brass(LP) and other brands whose flash hole was smaller than the FC cases. It really doesn,t seem to make any difference, even when using several different powders, velocity is really close. Interestingly, accuracy differences did show up on paper. The edge seemed to go the small primer cases, a small edge, but it was a fun few days shooting and testing. I'm over it now :) I'm guessing this will make more of a difference than the primer. I recently decapped a bunch of 45 before wet tumbling them and never realized how much the flash hole size varies. |
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Quoted:
I'm guessing this will make more of a difference than the primer. I recently decapped a bunch of 45 before wet tumbling them and never realized how much the flash hole size varies. Quoted:
Quoted:
I have done this and played with FC brass(LP) and other brands whose flash hole was smaller than the FC cases. It really doesn,t seem to make any difference, even when using several different powders, velocity is really close. Interestingly, accuracy differences did show up on paper. The edge seemed to go the small primer cases, a small edge, but it was a fun few days shooting and testing. I'm over it now :) I'm guessing this will make more of a difference than the primer. I recently decapped a bunch of 45 before wet tumbling them and never realized how much the flash hole size varies. In the past I've always just sorted the brass, loaded it then tossed it all in an ammo can and never paid attention to the primer size when shooting it. For shooting steel and paper at the range it definitely doesn't make a difference. My wife and I shot our first USPSA match a few weeks ago, and we are planning on doing it again in Jan. so I figured while I'm working up a new load I might as well be a little more exacting about it and use the chronograph. At least now I know that I can shoot the SP brass at matches in the winter where I'll probably lose the brass in the snow, and not have to worry about it being any different velocity wise from the normal LP loads. On a side note, I was surprised by how well the Lee powder measure on the Pro1000 worked with Unique. It's the first time I've used a flake powder in there and every load out of the 20 or 30 that I checked was +/- 0.1 gr. In the 500 rounds that I loaded over a couple of evenings last week, I never had to stop to fix a jam or hang up of any kind on the press. |
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