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bullet seating depth for 7mm rem mag

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  #8  
Unread 06-15-2009, 12:50 PM
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Join Date: Dec 2007
Location: Youngsville, NC
Posts: 433
Re: bullet seating depth for 7mm rem mag

Over the last couple of years I have had several Remington 700s and model 7s with tthroat lengths way beyond SAAMI and CIP specs. Especially on 308, 5R mil spec rifles. Having discussed this with numerous other gunsmiths and the Reamer maker(s) that Remington uses we have come to a consensus that the folks at Remington are running wild with throating reamers or flex hones. Because of the barrel contours (lack of metal) the factory barrels can not be saved and have to be replaced. Properly cut chambers will allow for bullet seating that will work using the magazine. I have saved a few factory barrels by using Kevin Wyatts extended mag boxes (+.110 longer) and some machining of the loading ramp.

Nat lambeth
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  #9  
Unread 06-16-2009, 11:44 PM
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Join Date: Oct 2006
Posts: 650
Re: bullet seating depth for 7mm rem mag

I have a Ruger #1 in 7mmMag that likes 3.34" with any bullet.
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  #10  
Unread 06-18-2009, 06:01 AM
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Join Date: Jun 2009
Posts: 6
Re: bullet seating depth for 7mm rem mag

Thanks for the info about checking the throat chamber depth first Nat.Everything seemed to go like clockwork after that, my overall cartridge length when touching the rifling came to 84.55mm, then I backed it off .254mm giving me 84.3mm. They seem to chamber quite good with plenty of free play in the mag. I have loaded 4 groups of 3ís that I will hopefully be trying out on the weekend :- 63gr. 63.5gr. 64gr. & 64.2gr .
Once I find my best group with the powder, then Iíll play around with either getting further or closer to the lands
Thanks very much for your helpful advise Nat.
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  #11  
Unread 06-18-2009, 06:23 AM
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Join Date: Jun 2009
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Re: bullet seating depth for 7mm rem mag

Quote:
Originally Posted by Clark View Post
I have a Ruger #1 in 7mmMag that likes 3.34" with any bullet.
I must be pretty close to the ball park because there is only .03"(.076mm) difference between your bulletts & the measurements I have found & loaded up, thankyou very much for the input Cark.
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