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Normal Topic 357 Maximum for Cast PBB Cartridge (Read 82 times)
joelpend
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357 Maximum for Cast PBB Cartridge
Today at 12:01pm
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If I were to do this using a .358" groove barrel, What would be the maximum weight plain base bullet for a smokeless round? Target would be 1350-1400 fps. BACO shows a 1.45" long 340gr  but I'm wondering is this bullet too heavy for the 357 max case size. Looks like it would require about a 11 twist barrel. I am sure the old 38 Ballard Extra Long used much lighter bullets than what I am hoping could work.
  
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marlinguy
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Ballards may be weaker,
but they sure are neater!

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Re: 357 Maximum for Cast PBB Cartridge
Reply #1 - Today at 12:11pm
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The .38 Ballard Extra long doesn't have much in common with the .357 Max case beyond length. It used a 150 grain bullet, and had a twist rate about 3x slower than your 11" twist rate. It also used a groove diameter around .378" with a heeled bullet.
You're going to be pretty much on your own to figure out a good load, but I think the 11" twist should handle a 250-300 gr. bullet easily. Not so sure about that 340 gr. though. Would be nice if someone had some heavy bullets to try before buying a mold that drops a 340 gr. bullet.
  
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frnkeore
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Re: 357 Maximum for Cast PBB Cartridge
Reply #2 - Today at 6:39pm
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I have a 357 Max on a LW with a 28" long 20 twist barrel.

14.0 gr of 4227 with a Lyman 35875 or a 358315 mold (both 208 gr) I get 1437 fps , shot breech seated.

That load would work in a Ballard but, I wouldn't want to go much more.

SAECO makes a 200 and 245 gr molds. I'd hold it at 13.0 gr with the 245 gr bullet, reduce loads 1.0 gr for fixed loads.
  
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