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< 16ga. Ammunition & Reloading ~ Low Pressure bismith load needed |
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Posted:
Sat Jul 07, 2018 7:41 pm
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Member
Joined: 01 Dec 2008
Posts: 605
Location: Topeka, Kansas
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Could not find a sub 8,500 PSI cheditte bismuth load other than two LPG, which were noted as inconsistent
However did note the following possible loads
Federal hull, 24.0 grns Longshot, Fed209A primer, Rem SP16 wad, 7,800 PSI 1295 FPS
Federal hull, 25.0 grns Longshot, Fed209A primer, Rem SP16 wad, 8,000 PSI 1300 FPS
PM sent to Woody |
_________________ Michael
Topeka, KS |
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Posted:
Sun Jul 08, 2018 7:45 am
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Member
Joined: 08 Aug 2011
Posts: 1946
Location: Central CT
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old colonel,
The problem with those two loads is that you will get powder migration. I used a similar load and I believed it was going to be OK, but if the loads are jostled around the powder will migrate. I found it out the hard way, click.....poof......rooster was safe.
At one time I did post that Longshot would not migrate with the SP16 wad in a Federal or Cheddite hull......I was off base with that information.
I have been successful using a Precision Reloading 12 Ga. Tight Seal between powder and SP16 wad to stop the migration of powder in these loads. |
_________________ Mark |
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Posted:
Sun Jul 08, 2018 9:04 am
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Posted:
Sun Jul 08, 2018 9:46 am
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Joined: 24 Jul 2016
Posts: 548
Location: Ohio
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Dogchaser37 wrote: |
old colonel,
The problem with those two loads is that you will get powder migration. I used a similar load and I believed it was going to be OK, but if the loads are jostled around the powder will migrate. I found it out the hard way, click.....poof......rooster was safe.
At one time I did post that Longshot would not migrate with the SP16 wad in a Federal or Cheddite hull......I was off base with that information.
I have been successful using a Precision Reloading 12 Ga. Tight Seal between powder and SP16 wad to stop the migration of powder in these loads.
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Did you reduce the powder at all? How about a nitro card under the SP16? Thanks. |
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Posted:
Sun Jul 08, 2018 10:57 am
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Member
Joined: 01 Dec 2005
Posts: 1550
Location: Minnesota and Florida
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Why not just use another wad that is compatible with the hull - Gualandi, for just one example. SP16's and R16's need tight hulls like RGL's or Rem SP's, and Win Compression Formed types. Yeah, I know about the "cup-expanding" mod to the Rem PowerPiston wads, which works in thin-wall Rieffenhauser hulls if you like to fiddle - nothing wrong with that, either. |
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Posted:
Sun Jul 08, 2018 2:21 pm
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Member
Joined: 01 Dec 2008
Posts: 605
Location: Topeka, Kansas
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All great ideas
The original request was for 2 1/2 in Bismuth low pressure (which I consider to be sub 8,500 PSi)
I provided tested data pulled from a reputable source.
I agree on placing a thin card to help with migration, but I note if I posted that I am no longer posting tested data. If you add a thicker card you begin to run into the height of the load and making it more difficult to meet the original posted request of a 2 1/2 inch low pressure load.
Concur the precision reloading thin seal maybe the best option and likely to have little or no effect on pressure or velocity
You can also use a bit of Saran Wrap too, but again not a tested load
Reference changing wads again, a neat idea, however the tested data I have available does not provide the low pressure loads which was the request. Further trying to go low pressure with CF Win AA with bismuth puts you in experimental territory..
There is some LPG data, but posting that goes against my commitment when I joined the LPG
While I am willing to play around with data to build loads for 2 1/2 RMC, I am personally cashing those checks and taking those risk, however minimal. l am loathe to wing it when posting online where not everyone has the same experience and judgement. |
_________________ Michael
Topeka, KS |
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Posted:
Wed Jul 11, 2018 5:43 pm
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Joined: 12 Feb 2018
Posts: 258
Location: West-central Missouri
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Lyman 5th Edition pages 244 & 245 multiple low PSI loads 7,600 to 8,600 with Federal & Fiocchi cases... |
_________________ An ounce of fives, the smell of nitro in paper hulls, wet gundog, and Hoppe's #9... |
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