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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles
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Sig55
.224 member


Reged: 22/05/04
Posts: 11
Loc: Virginia
Throat length on CZ 550?
      #16834 - 17/07/04 11:52 AM

I've been trying to determine the throat depth on my 375 and so far I've not had much luck. The Nosler manual says to take a fired and unresized case and put a little bend in the neck so that the bullet won't just drop down into the case. I assumed that the bulled would be pushed back to a certain point and I would just subtract .03 or .015 or whatever and be done with it like the manual says. Well, the rifling isn't pushing the bullet back into the case at all, even at an OAL of about 3.8 inches. Does anyone have any suggestions. I'm using speer 270 gr BTSPs (on hand already at local shop). Thanks in advance,

John Sigmond

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cr500
.300 member


Reged: 11/10/03
Posts: 215
Loc: Singleton ,Australia
Re: Throat length on CZ 550? [Re: Sig55]
      #16844 - 17/07/04 05:54 PM

Unless you have a throat length gauge, the way you are doing it sounds OK. I just checked my 300 weatherby the other day the same way. I got a fit so that I could push the bullet in by hand ,then seated the bullet so it was only just being held by about 0.040" ,then seated the case and closed the bolt.(No primer or powder). When I pulled the case out ,the rifling had pushed the bullet in a few mill and there were no marks showing that the bullet had stuck in the rifling and pulled out of the case. At this depth, the bullet was still sticking out too far to eject properly though. With my 308 with a very badly worn barrel, the bullet doesnt contact the lands when just started in the case, I have had to push the bullet into the barrel/chamber with a cleaning rod ,then put another cleaning rod down the barrel from the muzzle end and mark how far it goes until it touches the bullet. Then put a seated round in the chamber (no powder and primer again)and put the cleaning rod down the barrel again and see what the difference is in bullet depth.

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