38-55 load development a start

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38-55 load development a start

Postby Ohio3Wheels » 27 Feb 2019 14

Starline standard length cases
CCI large rifle primers
Missouri Bullets 245 grain Hytek coated .379 dia
Varget
loads from Load Data min 28 grains max 34 grains
my loads
weight min max sd
28.0 1306 1375 26.8
29.3 1365 1380 10.6
31.0 1425 1440 6.3
32.2 1478 1555 30.5
33.0 1540 1614 27.1
33.5 1578 1641 27.6

Done using a MagnetoSpeed Sporter with the start sensor approximately 1.5 inches from the muzzle.

Next runs will work a couple of tenths either side of that 31 and also 5 more at 31 to see if it repeats. I'll take a SD of 6.3 most any day for a start and see if it can be made better. All loads were done using my Lee deluxe PM and verified on a scale at the first case in the string and the last. I've found the measure to be very consistent.
Waiting to see what comes of the planned work, but I have at least a slight suspicion that Varget may not be the best choice here and ,379 may be a tad fat on thee bullets. Time will tell,

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Re: 38-55 load development a start

Postby Ranch Dog » 28 Feb 2019 07

Here is everything I shot, a summary of 27 different loads, with my Rio Grande 38-55 by JES. My groove diameter is .376", at my request, and I shoot a .378" bullet. The bullets were cast with a 95% WW and 5% tin in order to approximate Lyman #2. They were water quenched and have held a 21 BHN.

I've included the case fill capacity because we are using a similar weight bullet with the only difference possibly being bullet length. Given that, using the same fill capacity, vs. charge (probably varies a tenth at the most), would give the same pressure results. My target PMax was 40K which the top end of each load approached. They all shot good which made it difficult to select "THE" load. 33.0-grains of H4198 won as it delivered over 2000 FPS (2018 FPS) with its five-shot group maintaining 1.5 MOA out to 200 yards.

  • Benchmark 34.9 (95%)~ 36.7 (103%)
  • BL-C(2) 40.2 (100%)
  • H322 35.2 (98%) ~ 37.1 (95%)
  • H335 37.4 (93%) ~ 39.4 (98%)
  • H4198 30.2 (89%) ~ 33.0 (94%)
  • H4895 35.4 (100%) ~ 37.3 (105%)
  • Varget 35.7 (100%) ~ 37.6 (105%)
  • W748 36.9 (93%) ~ 41.0 (103%)
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Re: 38-55 load development a start

Postby Ohio3Wheels » 28 Feb 2019 14

RD do you know off hand if NOE catalogues this mold?

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Re: 38-55 load development a start

Postby Ranch Dog » 01 Mar 2019 06

Apparently not, most of my designs have disappeared from his lineup.

The Accurate 38-345R seems to be my design.
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Re: 38-55 load development a start

Postby Ranch Dog » 02 Mar 2019 07

Why not the Lee 379-250-RF?

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Given the pressures you are shooting, a plain base would be fine. As far as molds prices go, you cannot beat it.
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Re: 38-55 load development a start

Postby Ohio3Wheels » 02 Mar 2019 12

Ranch Dog wrote:Why not the Lee 379-250-RF?

Image

Given the pressures you are shooting, a plain base would be fine. As far as molds prices go, you cannot beat it.

Looking at that and also thinking about getting a box of Penn Bullets. I've shot a lot of his 180 grain 357 bullets in the 357, 35 Remington and 357 Herret with no complaints.

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Re: 38-55 load development a start

Postby Archer » 04 Mar 2019 00

Ranch Dog wrote:Apparently not, most of my designs have disappeared from his lineup.

The Accurate 38-345R seems to be my design.


Hmmm...
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Re: 38-55 load development a start

Postby Ohio3Wheels » 31 Mar 2019 11

Ranch Dog wrote:Here is everything I shot, a summary of 27 different loads, with my Rio Grande 38-55 by JES. My groove diameter is .376", at my request, and I shoot a .378" bullet. The bullets were cast with a 95% WW and 5% tin in order to approximate Lyman #2. They were water quenched and have held a 21 BHN.

I've included the case fill capacity because we are using a similar weight bullet with the only difference possibly being bullet length. Given that, using the same fill capacity, vs. charge (probably varies a tenth at the most), would give the same pressure results. My target PMax was 40K which the top end of each load approached. They all shot good which made it difficult to select "THE" load. 33.0-grains of H4198 won as it delivered over 2000 FPS (2018 FPS) with its five-shot group maintaining 1.5 MOA out to 200 yards.

  • Benchmark 34.9 (95%)~ 36.7 (103%)
  • BL-C(2) 40.2 (100%)
  • H322 35.2 (98%) ~ 37.1 (95%)
  • H335 37.4 (93%) ~ 39.4 (98%)
  • H4198 30.2 (89%) ~ 33.0 (94%)
  • H4895 35.4 (100%) ~ 37.3 (105%)
  • Varget 35.7 (100%) ~ 37.6 (105%)
  • W748 36.9 (93%) ~ 41.0 (103%)
Image


Well, I finally got my Missouri Bullet shipment so getting on to more load work. H4198 this time. This bullet is .909 long and seated to the crimp groove the OAL is 2.6. No gas check but Hytek coated. Nominally .379 and thus far no signs of leading from the 200 rounds or so that have gone down the tube. The Lee mold is close to top of the list.

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Re: 38-55 load development a start

Postby Ohio3Wheels » 15 Apr 2019 11

Put together a ladder working up to the 33 grains of H4198. Now to find some range time.

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Re: 38-55 load development a start

Postby Ohio3Wheels » 18 Apr 2019 18

Range day. Hour and a half drive but worth, the rain stayed away wish I could say the same for the wind.

Went over there to run the ladder with 4198 and the MoBull 245 grain coated and to shoot a little black powder cartridge.

Before I go any further along here a big thank you to Michael for passing his 38-55 summary along.

Turns out the 33.0 grains of 4198 was just the ticket.

Min 2024
Max 2032
Avg 2027
SD 3.7

I didn't try for a group as the wind had the target swaying back and forth and at times felt like it was going to blow me off the bench. The numbers look like a good start so maybe next week without the wind.

I should add in here that these were loaded in twice fired StarLine cases to a COL of 2.6.

Happy Easter all,
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