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300Win Mag. Data

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 17:31
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Chief Sackscratch

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Ok, as soom of you know I am working on a 300 win mag build, I am getting components together for loading and want some advice, I have my Lee book as well as a hornady now so I am looking more at proven in the field data.  Heres the info for the barrel,

27.5" barrel, 1-10" twist, 1.25 benchrest contour by Douglas.

I imagine with the higher twist its going to like a heavy pill 180gr and above.  I don't plan on taking any game with this gun. only paper and empty water jugs to a max of 500yds until I get comfortable with the gun.  What bullet type and load do you guys use? Question I am going, as I do with all my guns, to try a variety until I find the best.   I would love suggestions for me to start with. Thanks



Edited by SVT_Tactical - January/30/2010 at 17:31
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 18:27
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In my 300 Win Mag A-Bolt Custom Trophy octagonal 26" barrel, 1:10 twist:

Lapua brass + Fed 215M + 75.0 gr RL 22 + 180 gr Accubond + 0.020" off the lands = 1 hole nirvana. Best group so far was 0.437". If I could find the target I'd post a picture.
 
But this is a hunting load. For paper I would use 180 gr SMK, or 185 gr Berger VLD HPBT for long range targets.
 
Don't forget to start lower on the powder charge.... for 300 Win, it starts and ends with Reloder 22 in a lot of rifles.
 
Edit: Can't find Lapua brass any more as it was discontinued, but WW brass is usually plenty good.


Edited by Texas - January/30/2010 at 18:30
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 18:49
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RL22 is a great place to start, as mentioned, but I had better results with IMR4350 in a Sako .300 WM and 180gr bullets.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 19:35
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trg 42 -- 210 vld. r 22, 4350 or 4831 good 1000yd set up.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 19:48
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X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ?

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Originally posted by cheaptrick cheaptrick wrote:

RL22 is a great place to start, as mentioned, but I had better results with IMR4350 in a Sako .300 WM and 180gr bullets.
IMR 4831 didn't seem to be a bad place to start for the 180 gr. pills either.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 19:55
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72gr of imr 4831 and 180gr sierra pro hunters
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 19:55
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+1 for 4831 and 180 gr. Nosler Accubonds.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 20:54
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My 300s all love 208-gr. Amax and 190-grain Sierra Match Kings.

I've played with various powders and primers, but find the rifle is more picky of the bullet than the powder, at least in my experience.

My heavy 300 did not like 168- or 175-grain SMKs.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 22:08
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Originally posted by Rancid Coolaid Rancid Coolaid wrote:

My 300s all love 208-gr. Amax and 190-grain Sierra Match Kings.

I've played with various powders and primers, but find the rifle is more picky of the bullet than the powder, at least in my experience.

My heavy 300 did not like 168- or 175-grain SMKs.
We've had simular results, but as we all know every rifle is different. Our best is with IMR 4350 and 180 gr. Nosler Accubonds. They fragment more on game than we like, but are crazy accurate. I think you would really like what they do to gallon jugs.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2010 at 23:11
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I should probably test more than I have but I load 190 SMK  2900 fps with IMR 4350.

Edited by Urimaginaryfrnd - January/30/2010 at 23:12
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2010 at 10:01
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since your use is so specific, look at building the gun around sierra 240 smk with a bc. of .710, the 10 twist may need to be changed to faster, but the advantages of shooting that bullet would be worth the effort.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2010 at 10:09
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Chief Sackscratch

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Thanks DC I will keep that in mind and try a box of them as well

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2010 at 15:53
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I went from 180 to 190 gr bullets and my 300 loved that.  Pushing it with RL-22 according to the Hornady manual and am moving them @ 2970 (I think, it was over 2900, but I would have to look at my records).  It has been a great load.  That is my hunting load and it works great.

For paper only, I think I would go up to the 208 gr A-max.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2010 at 18:03
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Thanks for all the advise guys, I am going to order a few different weights pretty soon.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/11/2010 at 21:24
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Ok I did marks Max overall length test and got restricted by my mag box but not by much.  MOL for use with the mag box is 3.383. and for single shot loading i get 3.494.  Does that sound right?  I pulled some factory ammo and it was 3.298 and the Lee book says that the case should be 3.340. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/11/2010 at 21:40
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The rifle will decide what is right and what is not.
 
 
Be safe.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2010 at 07:19
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If you are going to load single shot, let the rifling determine COAL. Manuals show SAMMI specs. For 180's in the 300 WM I would also try H4831 SC as it is almost interchangable weight wise with R22. One of the most accurate loads I've fired through my Winny was 70 grs of IMR-4350 under 180 Nosler BT's. I use Federal 215 to light all fires magnum.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2010 at 07:25
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I will look for H4831 or IMR4350 tomorrow at the store.  Gonna try to talk to wife into a trek to Gander Mountain about an hour from here.  We shall see, if not mace sports isnt' far I can sneak over there and back in an hour, she won't miss me! lol

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2010 at 07:32
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Don't forget the Hornady One Shot lube.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2010 at 07:42
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Hornady One Shot lube, is that for cases?  I use lee for that
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2010 at 08:12
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Use One Shot as case lube and you will never use all the other BS.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2010 at 08:18
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I have heard mixed reviews on all the lubes, I use the mixing method with teh Lee in a small spray bottle and it has been great,  I may try One shot one day and if it works better then maybe i will switch, but if its the same, can't justify more money for it.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2010 at 08:27
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If you are using something that works stay with it. Lately, I have seen some posts here about funky things going on while resizing and probably 99% of em were case lube (excess) related which is why I thought I'd throw it out there early. It's fast, not messy, hard to over-lube and has no down side.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2010 at 08:30
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i shoot imr 4831 with 180gr bullets out of mine,  if you want the ultimate use imperial resizing wax.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2010 at 08:33
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Have either of you tried the 10-1 mixed method with lee and alcohol in a spray bottle.  I put maybe 50 - 100 depending on what i am load at the time in a shoebox and as I shake it around gently I spray with the lube, roll it around a little and then empty on an  old golf towel to dry.  Works wonders and no problems i have encountered yet.
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