Just got some XTPs in 45 ACP 230 grain and 9mm 115 grain. I currently have 2 pounds of HP 38 and have used it in both 45 acp and 9mm loads with good effect. Anyways due to the XTP being longer what percentage of start load should I use? The start load for HP 38 with 230 grain FMJ works great for 230 grain plated bullets so perhaps that should be a start?
HP 38 and Hornady XTP recipes
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TurboFC3S
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Some may say otherwise, but I've tried testing loads with AA#5, Titegroup, and Longshot where the charge weight was the same but COL was varied ... in 45ACP of course. In all cases the COL had NO effect on velocity, which makes me assume no effect on pressure either.
Point is whether the XTP is longer or not wouldn't matter, use data for any 230gr jacketed bullet and seat wherever works best for your gun.
Point is whether the XTP is longer or not wouldn't matter, use data for any 230gr jacketed bullet and seat wherever works best for your gun.
TurboFC3S
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It does, in every other cartridge I've tested ... however in 45ACP it doesn't seem to. My guess would be that case capacity is high and pressure is low, making it much much less of a factor. The lower case bearing surface to bullet weight ratio could be a factor as well.
Faitmaker
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Hornady manual says COL for the HP-XTP in 9mm is 1.075 and max grain with Bullseye is 4.6. AA #2 max would be 5.1 and AA #7 is 8.6.
.45 HP-XTP has a COL of 1.23. Max gr with Titegroup is 5.2, AA #5 is 8.3. It really depends on which powder you are using.
Unless I misunderstood you completely and you wanted to know the starting load for using a .38 in a 9mm or .45. I have no clue.
.45 HP-XTP has a COL of 1.23. Max gr with Titegroup is 5.2, AA #5 is 8.3. It really depends on which powder you are using.
Unless I misunderstood you completely and you wanted to know the starting load for using a .38 in a 9mm or .45. I have no clue.
Here is a revived thread covering a little bit of how deep bullets are seated and pressure.
ArchAngelCD
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The data you are looking for is on the Hodgdon Load Data Site. If you use other sources and for some reason they don't list HP-38 use the data fro W231 since they are both the same exact powders labeled differently. (as per Hodgdon /IMR /Winchester) Hodgdon lists a starting charge of 4.2gr and a Max charge of 5.3gr HP-38 for a Hornady FMJ FP bullet. There's no reason not to use that data for the Hornady XTP bullet to work up a load.
freakshow10mm
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HP-38 is the exact same powder as Winchester 231. You can use the data interchangeably.
I buy HP-38 when I can because it's a bit cheaper than W231.
I buy HP-38 when I can because it's a bit cheaper than W231.
mongoose33
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I'm running the XTP 230gr bullet with 5.7 grains of W231 at 1.23 OAL.
I've chrono'ed that load at 850fps out of my XD-45 4" Service pistol, which is just where I want it to be.
It's a very accurate load and bullet.
I've chrono'ed that load at 850fps out of my XD-45 4" Service pistol, which is just where I want it to be.
It's a very accurate load and bullet.
The start load is the "start load" and you can use it as stated. If there is no start load listed reduce the maximum by 10% for your start load. With the .45 acp being a low pressure cartridge you are really working up for accuracy as you will not see typical pressure signs if you stay within the published load maximum charge level.
Every manual other than the current Hodgdon for the last 30 years has listed heavier charges with W231 than with HP38 on the same page with the same bullets and other components. If they are the "same" then why the discrepancy?
Hodgdons on line data and printed data manuals since they've taken over marketing of the Winchester powders (not the production) has simply lowered the W231 loads to the HP38 loads which has always been lighter.
Same may not meen identical. Two canister powder producers may blend he exact same bulk powder to meet exacting burn rates of their particular powder they sell under their label. I always figured the actual blend for burn rate by Hodgdon HP38 was a bit faster than Wincheters W231 blend resulting in the different data.
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freakshow10mm
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Call St Marks Powder company in Florida. W231 is the same as HP-38. Same as in exact and identical in every way. 231 is made by St Marks in Florida. They sell it to Hodgdon who distributes it under HP-38 label and Winchester distributes it under the W231 label. St Marks 231, Hodgdon HP-38, and Winchester 231 are all the same exact powder in every respect.
Hodgdon H414 is also the exact, identical powder as Winchester 760. Ramshot Silhouette is the exact, identical powder as the discontinued Winchester WAP. Winchester replaced WAP with AutoComp and Ramshot now distributes "WAP" as Silhouette.
Hodgdon H414 is also the exact, identical powder as Winchester 760. Ramshot Silhouette is the exact, identical powder as the discontinued Winchester WAP. Winchester replaced WAP with AutoComp and Ramshot now distributes "WAP" as Silhouette.
Sorry here is the link
http://www.thehighroad.org/showthread.php?t=460133
http://www.thehighroad.org/showthread.php?t=460133
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