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Bullet Seating Depth For Remmy .300

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Old 09-02-2009, 09:58 PM
Junior Member
Join Date: May 2009
Location: Panama City, Fl.
Posts: 17
Bullet Seating Depth For Remmy .300

I have a remmington 700 300 win mag ps bbl 26inch. I am trying to figure out a good bullet seating depth, I am using sierra 190 gr bthp and using H4831 powder at 69gr. I have been told to seat the bullet as long as my DM would allow and the bolt would close on. That is quite a bit longer than the 3.340 in the sierra reloading book. Was concerned about pressure buildup,but not sure how low to go with starting load. Thanks in advance for your help.
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Old 09-04-2009, 08:26 PM
Silver Member
Join Date: Nov 2007
Location: nw indiana
Posts: 143
Re: Bullet Seating Depth For Remmy .300

Mine are .010 off the lands. As for length I would guess there is about 1/8 -3/16 left in the magazine.

Im sure you will want to get the proper tools to measure your chamber as yours will be different. Do a couple of searches here and you will get a bunch of info.

My load is 79 grains of H1000 which is at/below the starting load for this cartridge at least in my Hodgon manual.
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Old 09-05-2009, 11:17 AM
Junior Member
Join Date: May 2009
Location: Panama City, Fl.
Posts: 17
Re: Bullet Seating Depth For Remmy .300

Grinnergetter thanks for the info. Thats what I did. Made sure the bolt would close and then backed the seating depth to fit in the DM with a little bit of space. Am going to drop my load down to 67g of H4831 and run it through the chroney and see what speed I am getting. Am wanting to keeo it at around 2900 fps.Fin72fan
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