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Remington 700 Sendero I with long throat.

 
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  #1  
Old 01-08-2011, 09:54 PM
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Remington 700 Sendero I with long throat.

First off, I wanted to say this forum has been a great resource since I first started handloading 6 months ago.

My question is this. My gun is a 300 win mag and the max length in my Nosler Reloading manual is 3.340 (Might be off?), but with an OAL gauge I measure an OAL of 3.585 to get a 200gr Partition to get it to the lands. Is it safe to load past the listed max length? If so, how much of a jump should I start with? What lengths would I load to find the best jump for my gun?
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Old 01-08-2011, 10:15 PM
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Re: Remington 700 Sendero I with long throat.

Is this a new gun or does it have lots of rounds through it.
I usally start off around .030 off the lands
but I really dont like getting to close Just me
lots of guys load alot closer
retiredcpo
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Old 01-08-2011, 10:56 PM
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Re: Remington 700 Sendero I with long throat.

I have a 700 that is a 300 Winchester like yours. I had a 26 inch barrel installed and long throated so that I could seat a 180 grain Partition out to an OAL of 3.6 inches. That puts the base of the bullet even with the bottom of the case neck. [case neck and shoulder juncture] The bullet does not protrude into the powder space. That way you can safely burn 2-3 grains more of powder and therefore have more velocity.

If you had a long throat but a short magazine that would be a problem. Not with a 700, just seat the bullets out long and go shooting.

Regards, Keith
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Old 01-09-2011, 08:56 AM
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Re: Remington 700 Sendero I with long throat.

To answer your question, yes it is ok to go over the COAL listed in manuals. Those are only guide lines that will work through most any action. If you are loading for a hunting rifle I would not load closer than 10 thousands to the lands. I have stuck a bullet in the bore unloading a round that was loaded close to the lands and did not have a cleaning rod and it ruined a days hunt. To find your best accuracy start at 10 thousands off and seat 5 rounds at 10 thousands deeper until you get 40 thousands off the lands. Repeat your best grouping depth to verify and then seat 5 rounds 5 thousands longer and shorter to see if it makes things better.
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Old 01-09-2011, 09:08 AM
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Re: Remington 700 Sendero I with long throat.

I too have a factory 700 in .300 win mag that has a very long throat. In fact I cannot get a 168 VLD to the lands. My Magazine will hold rounds up to 3.610 so it never has been a problem. And no it isn't just a rifle that has been fired a lot and the throat worn. Mine MAY have 150 rounds through it since new.
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Old 01-09-2011, 11:40 AM
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Re: Remington 700 Sendero I with long throat.

Kieth: I'd be carefull about that extra two or three grains of powder. Not saying it won't work for you, but move up slowly as that's a big jump and the pressure spike nearly squares itself.

I think the issue here is a compound thing that is rather common with Remington rifles. First thing I'd check is the actual chamber deminsions (not the throat!). I have seen many Remingtons that had the necks chambered almost .100" longer that the case spec. That can be a good thing as well as a bad thing. Of course you will almost never have to trim cases! (I like that part!) So brass flow is not a major issue with the exception of the "dreaded doughnut" in the neck. The next issue is that it appears that Remington is adding some freebore to the throat to further reduce recoil. My next step would be a chamber & throat cast just to see what is actually there. My guess is that you have a chamber with plenty of free bore cut in it.

If the rifle shoots good for you, I'd just live with it! Seat the bullets out to to what you consider to be safe in the neck, and have fun. The otherway (if you don't like the long throat) is to do a three thread setback on the barrel, and then rechamber to what you are after. This will take about .180" out of the throat (you could go .240" and take it all out). Myself, I'd live with it for awhile
gary
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Old 01-09-2011, 11:03 PM
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Re: Remington 700 Sendero I with long throat.

Quote:
Originally Posted by Trickymissfit View Post
Kieth: I'd be carefull about that extra two or three grains of powder. Not saying it won't work for you, but move up slowly as that's a big jump and the pressure spike nearly squares itself.

I think the issue here is a compound thing that is rather common with Remington rifles. First thing I'd check is the actual chamber deminsions (not the throat!). I have seen many Remingtons that had the necks chambered almost .100" longer that the case spec. That can be a good thing as well as a bad thing. Of course you will almost never have to trim cases! (I like that part!) So brass flow is not a major issue with the exception of the "dreaded doughnut" in the neck. The next issue is that it appears that Remington is adding some freebore to the throat to further reduce recoil. My next step would be a chamber & throat cast just to see what is actually there. My guess is that you have a chamber with plenty of free bore cut in it.

If the rifle shoots good for you, I'd just live with it! Seat the bullets out to to what you consider to be safe in the neck, and have fun. The otherway (if you don't like the long throat) is to do a three thread setback on the barrel, and then rechamber to what you are after. This will take about .180" out of the throat (you could go .240" and take it all out). Myself, I'd live with it for awhile
gary
+1 on the powder charge! It may HOLD 2-3 more grains but you don't want to put that much more in if you are any where near max to begin with....Rich
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