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Hot Topic (More than 10 Replies) Stevens 28-30-120 (Stumpy) is Range Ready (Read 911 times)
John Boy
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Re: Stevens 28-30-120 (Stumpy) is Range Ready
Reply #15 - May 5th, 2019 at 6:06pm
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During Schuetzen's Golden Age, semi-smokeless was used as the main charge with a priming charge being 3-5 grains (bulk) DuPont No.1 smokeless.
Missed the smokeless side of the charge, didn't I  Embarrassed
  

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John Boy
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Re: Stevens 28-30-120 (Stumpy) is Range Ready
Reply #16 - May 5th, 2019 at 6:15pm
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And 1Fg compared with the reference velocity of 1400 fps, 1134 fps doesn't even come close
Oh well, a learning experience with this caliber.  Even the 4198 charge at 1310 fps doesn't come close to the stated 1510 fps
  

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John
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Dales
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Re: Stevens 28-30-120 (Stumpy) is Range Ready
Reply #17 - May 5th, 2019 at 6:49pm
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I bought a Stevens 52 in 28-30 a couple of months ago and have been working on smokeless loads . Tried 4100 and h108 with no luck , would get velocity drop of 200 fps at least 1 out of every 5 shots. Switched to 4227 and problems went away. I am using 130 and 150 grain bullets with a cork wad .

A while back some one was making 28-30 brass using 30-06 cases , must have been a lot of work and many steps involved.

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John Boy
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Re: Stevens 28-30-120 (Stumpy) is Range Ready
Reply #18 - May 5th, 2019 at 9:49pm
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Switched to 4227 and problems went away
Dales, good information. Why?
Alliant 300-MP burn rate is right in there with IMR/H 4227/4198 and a little slower than H110. So using 15.7gr of 4198, I'll drop down 10% and work my way up to where the rifle likes good accuracy
Thanks
As for the cork wad - on or off the powder column?
  

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Dales
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Re: Stevens 28-30-120 (Stumpy) is Range Ready
Reply #19 - May 6th, 2019 at 8:58am
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I tried 300MP also with the same problem , ignition problem ?  I have the wad 1/4" above powder . I am using Bertram cases so small rifle primers , maybe that is why original cases used large rifle primers .
Dales
  
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Dellet
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Re: Stevens 28-30-120 (Stumpy) is Range Ready
Reply #20 - May 6th, 2019 at 9:20am
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4227 is working good so far for me. Of the pistol powders mentioned, it seems generally more stable in reduced capacity loads and light bullets. Probably due to having more bulk, better fill, and generally takes a bit more powder to reach the same velocity.

4198 has a better fill, but leaves more unburned powder behind.

If your velocity is that much lower than a reliable prediction, I would capture a bullet and look for excessive carbon fouling in front of the base. Look for the same behind the neck of your brass. The pressure has to be going somewhere.

Also check the volume of the brass. My UMC depending on trim length, hold 38-39 grains of distilled water by weight. They are a bit short for the most part.

If using Quickload for estimates, I always have trouble with cast bullets matching predictions without making adjustments, and one of its shortcomings (or mine because I canít figre it out) is that it does not recognize the pressure increase when you jam a bullet in the lands. It will allow for a negative seating depth, 1/16Ē in front of the case is input as -0.0625Ē. But pressure and velocity drop in the program, when measured velocity actually increases.

For what itís worth, Iím using 12.6 grains of 4227 with a 135 Hoch bullet seated .080Ē ahead of the case. Velocity is in the low/mid 1500ís. I am sorting through some rifle and sight issues, as well as casting, but in general three shot groups are 3/4Ē at 50 yards. Tang sight, off bags. Load development really hasnít even started other than picking a likely powder.
  
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John Boy
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Re: Stevens 28-30-120 (Stumpy) is Range Ready
Reply #21 - May 6th, 2019 at 6:03pm
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I tried 300MP also with the same problem , ignition problem ? 

Dales, Definitely an ignition problem with 300-MP:
* I've shot 300-MP in 32-40's & 38-55's (fixed and breached) with LR Magnum primers ... all went boom and good SD's
Today I charged 12 cases with 300-MP, using CCI SR & Remington SR Benchrest primers
* One ignited the powder column
* 11 went 'Poof" and the powder looked like it was sprayed with water in the cases
* All with no wad
I'll bet money, when I get Magnum primers later this week - they all will go Boom
The one reload that did ignite of 300-MP, 14.5gr - clocked at 1809 fps
  

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John
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