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    • #25367
      dverna
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      I see that both the .308 and .338 Federal are rated at 62,000 psi and the .358 is at 52,000 psi. Why would that be?

    • #25370
      badbob454
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      possibly less brass at the base ? i would follow reccomendations and be on the safe side , possibly 308 resized to a 358 may handle more pressure , ill back out and let someone answer that knows better than me

    • #25373
      Larry Gibson
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      The 358 Win psi is based on SAAMI C.U.P. measurement as they have not updated that cartridge to peizo-transducer psi measurement. The .308W C.U.P. psi is also 52,000 psi. Ergo the peizo-transducer psi for the 358 Winchester is also 62,000. Just a matter of comparing apples to oranges makes the “difference”.

      Bottom line; there is no difference in the acceptable MAP between the .308W and the 358 Winchester.

      Larry Gibson

    • #25383
      dverna
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      Thanks Larry. That makes sense

      Don

    • #25426
      Anonymous
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      Larry: Clearly some of the hottest 358 handloads are getting pretty warm, yet still not hot as for a bolt action 700. Do you know of any reliable but not official peizo tests for top 358 loads

    • #25975
      Waksupi
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      dverna;n3729 wrote: I see that both the .308 and .338 Federal are rated at 62,000 psi and the .358 is at 52,000 psi. Why would that be?

      I would say it is because of the difference in bore size. Bigger bore + same available powder capacity = less pressure.

    • #25976
      lar45
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      Waksupi;n4429 wrote:

      I would say it is because of the difference in bore size. Bigger bore + same available powder capacity = less pressure.

      Bigger bore + same available powder capacity = faster powder to keep the same pressures. 😉

    • #25977
      Goodsteel
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      Great discussion. You guys are spot on.

    • #26200
      dverna
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      It would seem that bore has little to do with it. The force on the locking lugs will be a product of the area of the bolt face and maximum chamber pressure. I think Larry is correct. Or am I missing something?

      I can see a lower pressure rating if the brass is the weak link, but they both use the same parent case.

    • #26210
      Goodsteel
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      dverna;n4719 wrote: It would seem that bore has little to do with it. The force on the locking lugs will be a product of the area of the bolt face and maximum chamber pressure. I think Larry is correct. Or am I missing something?

      I can see a lower pressure rating if the brass is the weak link, but they both use the same parent case.

      He is spot on. As usual.
      Take it from me: 99% of the time, the only good reason for disagreeing with Larry Gibson is if you want to learn something fast.
      LOL!

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