300 Win mag seating depth

[kbrowne14]

I have Remington 700 long range 300 win mag.  I have about 500 rounds through it.  When I first got it, I tried using H-1000 but couldn't get any accuracy or consistency.  Switched to H-4831SC and kept going.  Well I want to try the H-1000, 212 ELD-X combo.  I checked the lands on my rifle with that bullet, and I found that my lands were 3.660.  My magazine length is right about 3.60.  So my lands are always going to be about 60 thou away.  Is that going to be a big deal for accuracy or Low SD's?  My throat has eroded a little bit, I used to be 3.660 with the 208 A-Max, but now it is 3.675.  I am going to shoot it tomorrow, and run it on the Magneto speed to see what I get.  Am I going to run into problems?

Anybody else have these distant lands from Remington?

[BULLBLASTER]

I am shooting 215 bergers at 50 off the lands just fine. I’d guess with the Eld x you could do the same based on my experience with them in other calibers.

You could also add a Wyatt’s mag box to the rifle to seat longer too. 

H1000 and heavys is a great combo in the winny

[kbrowne14]

Last time I tried the h-1000 and 208's, it didn't work out so well, nothing smaller than 2" groups.  but that was about 400 rounds ago, and 3 years ago.  So well will see, I am doing the ladder test tomorrow from 76 to 78.5.  Are you compressed on those 215's?

[BULLBLASTER]

Last time I tried the h-1000 and 208's, it didn't work out so well, nothing smaller than 2" groups.  but that was about 400 rounds ago, and 3 years ago.  So well will see, I am doing the ladder test tomorrow from 76 to 78.5.  Are you compressed on those 215's?

No not compressed at all at 78 grains. My oal is very long tho at 3.75+

You will hit pressure before 78.5 grains. Depending on Brass I’d guess you will top out in the 77 grain range at That length

[jasnt]

I shot 210 bergers in my old barrel and shot well with as much as .185” of jump.

[b23]

As was already mentioned, if you have an extended mag put in your rifle it'll open up your options.  It's not a very expensive mod and just about any gunsmith should be able to do the job for you.

[Mulie87]

I shoot 200gr ELDX with IMR4831 and 200gr AB’s with H4831 at .020 off lands. Shoots 1/2moa groups put to 550yds. This is a Remington Sendero .300 win mag.

[92xj]

I know for some that load date is like big buck honey holes but....


Mulie87, if you don't mind, what gr h4831 do you run pushing those 200ABs?

[kbrowne14]

I run 69 grains of h4831SC with my 200 NAB.  I’m moving about 2840 FPS and I used to be about .015 off lands, but now I am more like .030.


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[Jason]

What charge are you guys running for 180's with H4831sc and what are you seeing for speeds? Lately I have been battling H1000 and groups are horrendous.

[Oh Mah]

  they like the heavies,better grouping with the heavies regardless of powder brand. 

What primers are you (the ones having problems with h1000) using?A couple of the shooters from this forum put me onto the fed 215's and my grouping closed with h1000. 

[jasnt]

I’ve had my best groups with h1000, full case(just the slightest crunch) and cci 250’s and heavies.  210 bergers and 74.8 gr h1000 Nosler brass.  Bto 2.796 measured with Hornady gage. 2765fps es of 3.  1” at 200

[Jason]

I've always used WLRM primers for the 300wm. H1000 79.3gr 180ab's

[Biggerhammer]

I prefer speed with the .300 Win Mag when it comes to your average big game shots, point blank to 500 yards or so. RL-22 would be my first choice, IMR 7828 my second.

[kbrowne14]

I am looking for speed, I have a load with h-4831 that is accurate, but I want some speed to go along with the 212’s, because it’s for hunting.


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[Mulie87]

70gr of the H4831. It’s pushing the 200gr ABs at 2,800fps but that’s the most accurate load at .25” at 100yds and 4” at 550yds. During load development I got higher velocities and even 3000fps  with IMR4831 but accuaracy wasn’t that great. So I settled with accuracy over velocity. I can still reach out there.

I know some guys swear by RL22 for the .300, but I can’t get past the temperature sensitivity issues since I hunt in Montana where it gets damn cold.

After this hunting season i’m going try the 190gr Accubonds (due to cheaper bullet prices) and see how they work amd what kind of velocity I can get.

[Mulie87]

Federal magnum rifle match primers for me. Seem to do the trick, so I bought a brick of 1000ct.

[Curly]

Dont overlook RL26 in the 300wm.

[zwickeyman]

RL 26 here

75 gr with 200 grain Partitions @ 2930 fps .050 off.  H1000 works well for me also

[b23]

I know it's typically hard to find but if you can get your hands on some Vihtavuori N570 I think you'll be pleasantly surprised with the results.  Viht also has a new powder, N565, and it sounds like it's going to do very well in these size cases, too.

[kbrowne14]

Well I did an H-1000 ladder test today and I was not disappointed. Started at 76-and went to 78. I never had an SD over 5. Seated out to 3.600 (mag length).
76 was at 2910 with an SD of 3.6.

76.5 was at 2915, with an SD of 4.6.

77 was at 2941 with an SD of 4.6. It was also about 3/8” group

77.5 was at 2960 with an SD of 2, but slight pressure, very slight ejector swipe, and a small crater. 3/8” group.

78 was at 2980 with an SD of 5. A little too much pressure though. Ejector mark was deeper, and crater was deeper.

I think I am going to try the 77 grains. There was a very slight primer crater, but nothing else.


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[BULLBLASTER]

Well I did an H-1000 ladder test today and I was not disappointed. Started at 76-and went to 78. I never had an SD over 5. Seated out to 3.600 (mag length).
76 was at 2910 with an SD of 3.6.

76.5 was at 2915, with an SD of 4.6.

77 was at 2941 with an SD of 4.6. It was also about 3/8” group

77.5 was at 2960 with an SD of 2, but slight pressure, very slight ejector swipe, and a small crater. 3/8” group.

78 was at 2980 with an SD of 5. A little too much pressure though. Ejector mark was deeper, and crater was deeper.

I think I am going to try the 77 grains. There was a very slight primer crater, but nothing else.


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Called it...   

2940 is smokin that bullet out there from a 26 inch barrel

[kbrowne14]

That you did.  But yes, great velocity out of it


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[Oh Mah]

  what bullet?

[kbrowne14]

212 ELD-X


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[Oh Mah]

Ok thanks