So I ran a ladder using the HP-38 and the 124 PD JHP

[copemech]

WARNING: This thread contains

THEORETICAL LOAD DISCUSSIONS -
DATA PRESENTED IS NOT FOR USE in FIREARMS


Data was interpolated, but I stuck with my old Lyman bookk and closest match with the Speer 125 and 231 powder loaded to 1.075 which fits my guns nicely.

Surprised at results, a bit hotter than expected.

4.0 gr  1021 fps

4.2 gr  1069 fps

4.4 gr 1115 fps.

all sd's at 10, which is good for me.

Looking at the hodgden data for 124/125 loads it is just all over the board, specially with the 125 HAP data.

[noylj]

If you took out three different guns, you would get three different sets of velocity and SD, and that is with the SAME bullets and powder lots in all three guns.

[tcp112275]

What gun did you shoot those out of and how was the accuracy?

[1SOW]

For a full size 75:
The PD is a  l o n g bullet.  Load a little longer and the speeds likely will match up to your expected speeds.
4.0 grs of n320 at 1.097 (1060+ fps) and should be fairly close to 231 with 4.3/4.4  grs at a little longer oal..   My CZs accept this oal.  Test yours first.

[copemech]

These were shot with my P09, which has a 4.5 barrel or something. I cannot go longer , really , with this bullet in my guns.

I was not really shooting for groups with this test, but for chrono data. The groups ran about 2.5 in. but I was not on my game.

I really just picked up this powder to see what it would do as a mid range  powder as compared to titeggoup and the CFE/ Power pistol that I have been working with. For more of a plinking load. I did not think it would run quite that fast!

My Power pistol loads at 5.5gr are running about 1120 fps  which makes at or near 140PF and does have some recoil and flash. I had brought some along, and toward the end of the session I did pull off a really good group of ten at just over an inch with two flyers within that!

Not bad for my old sorry butt! But I rely on the red dot and the rest!

[oldfrank]

Your numbers are fairly close to what I get. I don't use that bullet but use Xtreme 1245 RN.

I load out to 1.135 and it works in every CZ I own or have owned but that doesn't mean it will work in yours.

I pay very little attention to what the books say other than minimum and maximum loads.I rarely get close to what they say the load will produce.

[Boris_LA]

I have tested PD 124 JHP with HP-38 powder in my CZ-SP01. COAL just a touch shorter 1.070". The best accuracy was with 3.9gr and 4.0gr of powder. I felt that over 4.1gr was a bit too hot for my liking.

[2bfree]

That seems odd. at least to me. I have been loading PD 124 RN @ 4.4 and 1.135 OAL, For years, It has never seemed hot to me  Hodgdon data list 125 FMJ @ 4.4 1009 FT/S starting and 4.8 Max for 1088 Ft/S using an OAL of 1.090. Oh well.

[Boris_LA]

That seems odd. at least to me. I have been loading PD 124 RN @ 4.4 and 1.135 OAL, For years, It has never seemed hot to me  Hodgdon data list 125 FMJ @ 4.4 1009 FT/S starting and 4.8 Max for 1088 Ft/S using an OAL of 1.090. Oh well.

PD RN (FMJ) have very different profile from JHP that OP (copemech) mentioned. My PD FMJ RN was tested at COAL 1.150 and start grouping with about 4.4-4.5gr of HP-38. It was not hot at all. They seat in the case very shallow ~ 0.18-0.20" unlike JHP that seat much deeper. ~0.30"
I haven't found great long distance accuracy with this combo and change recipe to Titegroup instead.

[Boris_LA]

Looking at the hodgden data for 124/125 loads it is just all over the board, specially with the 125 HAP data.

I have found that PD 124 JHP is exact match for Hornady 125HAP bullet. The same load and the same POI. I use them interchangeably without dies, powder drop or gun sights adjustments.

[1SOW]

Hogdon's load data is from a 4" bbl.

[copemech]

I have tested PD 124 JHP with HP-38 powder in my CZ-SP01. COAL just a touch shorter 1.070". The best accuracy was with 3.9gr and 4.0gr of powder. I felt that over 4.1gr was a bit too hot for my liking.

Yes, and the objective was to work up softer loads. At the 4.0 level and 1021fps that works out to 126PF and did seem noticeably different from the others. I'll see just how well they will group, but for ringing steel I think they will work out.

[copemech]

Looking at the hodgden data for 124/125 loads it is just all over the board, specially with the 125 HAP data.

I have found that PD 124 JHP is exact match for Hornady 125HAP bullet. The same load and the same POI. I use them interchangeably without dies, powder drop or gun sights adjustments.

Yes, but I cannot figure exactly why Hodgden greatly reduces the load data for the  hap as compared. I think it must be because the 125 Hap is listed at a .356 dia bullet for some reason, and the 115 Hap is not, nor are the XTP of either weight.

[copemech]

Hogdon's load data is from a 4" bbl.

Which again may explain something, while coming out of a P-09 with 4.5 or so.

[Boris_LA]

My objective was to find the accurate bullseye load for 50m. The best groups with HP-38 were about 4" at 50m and were not good enough. For shorter distances steel shot games it could be just fine.