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Rem 700 action limits

 
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  #1  
Old 02-14-2010, 10:07 PM
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Rem 700 action limits

I have a Remington 700 action that is fitted with a 30" heavy Lilja barrel plus brake in .338 Edge.
Now this rifle can handle up to 97 gn of H1000 no problem. It shoots the 92 gn load very well, but anything past 92 grains and accuracy starts to deteriorate.
I have tried looking for nodes etc but it is no good. I am beginning to think that action flex under the higher loadings with the long heavy barrel is the problem.

So what do you think? Are there limits to loading/barrel weight and length that effect the Remington 700 action?

What would be a good custom action that would solve these problems?
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Old 02-15-2010, 11:52 AM
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Re: Rem 700 action limits

I wouldn't think that the strength of the action, in and of itself, would be the problem.

I had some loads in an Allen Mag cartridge in an a Rem 721 action with an improper type of powder. The powder bridged giving very very excessive pressures. I mean very excessive. Longer story short all three gave the same pressure signs, ruined cases, primer dislodging, and on and on. Still shot 1/2 MOA.

Measuring of fit and finish may be in order.
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Old 02-15-2010, 12:01 PM
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Re: Rem 700 action limits

I don't think your action is the limiting factor. It could be just a quirk of the cartridge, powder, and bullet combination.

Shawn says that his common load is 92-94g of H1000. Sounds like your right there.

If you really need to push it to the limit, you might need to try a different powder.
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Old 02-15-2010, 07:53 PM
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Re: Rem 700 action limits

97g of H1000 under a 300g SMK sounds a wee bit on the warm side, probly why your groups aren't very good.

Dont have QL handy at the moment, but I think around 91g is at its max pressure limit.

97g is going to put you waaaaaaaay over the 70K mark...

My new lot of H1000 in my 338 EDGE w/28" HART barrel, I had to back down to 89g from the standard 92g when I first developed the load. I was piercing primers with the new lot with 92g, velocity was 2900-2950fps and groups were around 1 MOA. I knew something was up...Backed off to 89g where velocity was back down to 2825-2850fps and groups were back down to 1/2 MOA.

I dont think your 30" barrel is the problem myself...
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Old 02-15-2010, 10:23 PM
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Re: Rem 700 action limits

Quote:
Originally Posted by remingtonman_25_06 View Post
97g of H1000 under a 300g SMK sounds a wee bit on the warm side, probly why your groups aren't very good.

Dont have QL handy at the moment, but I think around 91g is at its max pressure limit.

97g is going to put you waaaaaaaay over the 70K mark...

My new lot of H1000 in my 338 EDGE w/28" HART barrel, I had to back down to 89g from the standard 92g when I first developed the load. I was piercing primers with the new lot with 92g, velocity was 2900-2950fps and groups were around 1 MOA. I knew something was up...Backed off to 89g where velocity was back down to 2825-2850fps and groups were back down to 1/2 MOA.

I dont think your 30" barrel is the problem myself...
My Edge has a special cut chamber. It can run with lower pressure than a standard chamber and hold more powder.
Pressure is not an issue, and case life is good.
Accuracy is also good, but just not quite as good as with the 92 gn load.
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Old 02-16-2010, 05:15 AM
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Re: Rem 700 action limits

If case life is good and you are sure pressure is low, then yes perhaps it is time to start exploring limitations within other variables.

I see you have a brake so you probably don't have a whip problem. It is true that the M700 is truly at its limit when laoded to full RUM velocities. I think Dan Lilja got right up this one a while back via an article on his site.

In my .375RUM, I am able to run a 225 grain Bullet at 3250fps, producing one hole groups at 100 yards (a fairly stout barrel). I can shoot a 260 grain bullet at 3120fps for around .75". On some days, if I get scared of all of that recoil, I shoot all to hell. The M700 is (in theory) at its absolute limits of stress/ load bearing athese velocities.

Hand holds, trigger let off, grip tension- all have an immensely profound effect on groupings at the power level your are using so start by observing your own practices in order to eliminate these variables. Then again, recoil may be so light due to an effective muzzle brake, as to not suffer from the effects of hand hold position and tension. You will have to observe this for yourself. Is there a high level of recoil? If so, it is likely that hand hold tension/position will be a major factor in accuracy.

Another variable is pinching within the bedding platform. Check it over and watch for tight areas around the recoil lug (am assuming the rifle is bedded).

Changes in hand loads will produce yet another set of variables.

Anyway, those would be the three areas I would look into if I was determined to load the cartridge balls to the walls- assuming you are correct in your initial observations regarding current pressures (everyone gets caught out with pressure problems atleast a few times in their reloading careers).

As for bridging, I don't think it is a problem in this instance but am so glad somebody is willing to bring the subject up. Not enough people understand the ramifications of powder bridging in the big Magnum cartridges. RoyinIdaho brought up a serious and real issue that occurs from time time and needs to be shared on the boards as he has done in order to warn others.

Last edited by Kiwi Nate; 02-16-2010 at 05:37 AM.
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  #7  
Old 02-16-2010, 02:07 PM
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Re: Rem 700 action limits

Not to sound dumb, but I hadn't heard of Bridging in powder before, but I'm still a fairly new handloader.

Is this something I should be worried with, when dealing with my .300 RUM ? I use RL22, RL25 and Retumbo.
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