300 Win Mag case length ?

KROIL · December 19, 2007, 07:57 PM

The specs I have read 2.620 to 2.610 for the case length. I picked up a bag of once fired winchester .300w/m's. After resizeing in my RCPS die ,I found many of them were under 2.610. Now, we all know over is bad , but how FAR UNDER can one go SAFELY on length on this case ? Thanks

Scorch · December 19, 2007, 09:41 PM

Should be fine to use. Max case length is a caution because of the possibility of jamming the neck into the end of the chamber, causing high pressure du to failure of the case neck to release the bullet. I have measured cases from the factory that ran.010"-.013 under trim-to measurement with no problems. They will grow.

KROIL · December 21, 2007, 06:30 PM

Thanks , Scorch ! I guess I was worried about neck length because the .300 win mag has been touted as " too short " of a neck for good bullet grip. I dont know where that came from , but I think I read it in a load book. I never found that problem. Thank you again for addressing my concern.

December 19, 2007, 07:57 PM	#1
KROIL Senior Member Join Date: August 25, 2006 Posts: 306	300 Win Mag case length ? The specs I have read 2.620 to 2.610 for the case length. I picked up a bag of once fired winchester .300w/m's. After resizeing in my RCPS die ,I found many of them were under 2.610. Now, we all know over is bad , but how FAR UNDER can one go SAFELY on length on this case ? Thanks

December 19, 2007, 09:41 PM	#2
Scorch Senior Member Join Date: February 13, 2006 Location: Washington state Posts: 15,248	Should be fine to use. Max case length is a caution because of the possibility of jamming the neck into the end of the chamber, causing high pressure du to failure of the case neck to release the bullet. I have measured cases from the factory that ran.010"-.013 under trim-to measurement with no problems. They will grow. __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services

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December 21, 2007, 06:30 PM	#3
KROIL Senior Member Join Date: August 25, 2006 Posts: 306	Thanks , Scorch ! I guess I was worried about neck length because the .300 win mag has been touted as " too short " of a neck for good bullet grip. I dont know where that came from , but I think I read it in a load book. I never found that problem. Thank you again for addressing my concern.