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Hot Topic (More than 10 Replies) 577-450 (Read 1681 times)
dragonblood9
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Re: 577-450
Reply #15 - Nov 7th, 2025 at 7:56pm
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first firing, unsized.  meant to fireform i plan on neck sizer from this point forward.  i'll probably back the charge down to 65gr.
  
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MartiniBelgian
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Re: 577-450
Reply #16 - Nov 8th, 2025 at 4:06am
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dragonblood9 wrote on Nov 7th, 2025 at 7:56pm:
first firing, unsized.  meant to fireform i plan on neck sizer from this point forward.  i'll probably back the charge down to 65gr. 

Not enough powder, I'd consider 70 as a minimum, and 75 a good working load.  Use Fg, that will also help.  Quite some time ago I did some extensive experimentation to determine what works and what doesn't as to accurate loads.  If you PM me your email, I'll send you the document that kinda summarizes my trials.
  
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dragonblood9
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Re: 577-450
Reply #17 - Nov 8th, 2025 at 6:35am
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ok, not 65gr.  i'm just punching holes in paper for giggles. i thinking along the lines of the carbine load.

This might be a fevered dream but, i think someone mentioned using a "460 rowland" die as a neck size?
« Last Edit: Nov 8th, 2025 at 6:42am by dragonblood9 »  
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DoubleD
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Re: 577-450
Reply #18 - Nov 11th, 2025 at 9:00am
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Reminder.

CBC  cases use pistol primers.
Bertram cases use rifle primers.

Use rifle primer in CBC case and they will protrude.

Use pistol rimer in Bertram cases and they will move-some times depressed, sometimes stay flush and sometime protrude.   Type and quantity of powder depending.

Head space-no go on the MH action is .010 and is measured with go gauge in closed chamber and feeler gauges inserted behind head of gauge and breech block face.
  
Douglas, Ret.
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