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 300 win mag load data
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zcook
Starting Member

USA
5 Posts

Posted - May 05 2009 :  17:56:09  Show Profile Send zcook a Private Message  Reply with Quote
Hi everyone. I have used a few loads from this site before for my 25-06, .270, .243 ect but can't find a load for 178 grain a-max's for my 300 win mag. I bought a bulk shipment of ammo and am wanting to start reloading my empty brass after seasoning my barrel but haven't had any luck finding a load for this bullet. I bought the 178g a-max's and 190g hornady BTSP and have H4350, H4831sc, Hogden Varget, and H1000 powder to work with right now. I have a recipe for the 190 grain pills but none for the 178 grainers. Any good load data would be greatly appreciated weather it be a starting load or a load that shoots great for you.

zeb

woods
Advanced Member

USA
1948 Posts

Posted - May 05 2009 :  20:46:10  Show Profile Send woods a Private Message  Reply with Quote
75.5 gr RL22 with a Fed215 primer


When someone shares something of value with you and you benefit from it, you have a moral obligation to share it with others.

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zcook
Starting Member

USA
5 Posts

Posted - May 05 2009 :  20:52:17  Show Profile Send zcook a Private Message  Reply with Quote
i am shooting a ruger 77 mark II and have been shooting right at MOA 100 yard 3 shot groups with winchester 180 grain power points. i have a 24 inch barrel and 1 in 10 twist ratio. I think the 178 grainers will shoot quite a bit tighter. what is your OAL, brass make, and is it for the 190 or 178 grain pills?

zeb
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woods
Advanced Member

USA
1948 Posts

Posted - May 06 2009 :  00:35:24  Show Profile Send woods a Private Message  Reply with Quote
Actually the load I gave you was for 180 gr bullets but should be fine for the 178 or 190 gr bullets also. Almost all 300 win mags are 1 in 10 twist and it would have to be a specially ordered barrel to have any other to the best of my knowledge.

I set my OAL according to the measurement I get from measuring the distance to the lands with a particular bullet. Most regular cup and core type bullets do just fine at .025" to .030" off the lands and the monometals like Barnes at .050" off. I have used Nosler, Norma and WW brass in the 9 different 300 win mags I have reloaded for.

IMO, in the list of powders you posted, H4350 would be good for lighter bullets like 165 gr, H4831 is good for the middle ground like the 180 gr bullets (although I have not had good luck with it) and H1000 is slow enough to be good with the heavier bullets like the 200 gr ones.

IME, I have had the best results with IMR4831 for 165 gr, RL22 for 180 gr and RL25 for the 200 gr bullets. Always magnum primers (Federal by preference)

YMMV


When someone shares something of value with you and you benefit from it, you have a moral obligation to share it with others.


Edited by - woods on May 06 2009 00:37:43
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zcook
Starting Member

USA
5 Posts

Posted - May 06 2009 :  16:52:02  Show Profile Send zcook a Private Message  Reply with Quote
From everything I have read over the last couple of years on the 300 win mag, I agree 100% with you. I have been using winchester large rifle primers for most of my loads in my other rifles and have good luch with them. Also I have reloaded a from with WLRM in my 25-06. If my loads are not up to par I will try the federals before i change anything else since primers are the cheapest component. Very seldom have I heard of a primer changing shot group sizes, but I have heard a few. Thanks for everything so far. I will keep everyone up to date if i find a good load.

zeb
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woods
Advanced Member

USA
1948 Posts

Posted - May 06 2009 :  21:20:30  Show Profile Send woods a Private Message  Reply with Quote
Hey zcook

I have done a few side-by-sides and have never found a case where the Fed215 or Fed215M did not make a positive difference. Here is an extreme example






As far as the 300 win mag goes, this is one of my favorite loads


Accuracy seems to degrade if I push it faster than 2900 fps.


When someone shares something of value with you and you benefit from it, you have a moral obligation to share it with others.

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zcook
Starting Member

USA
5 Posts

Posted - May 06 2009 :  22:30:45  Show Profile Send zcook a Private Message  Reply with Quote
Thanks, I will try to find some Saturday when I go to the city. From what I have heard primers are getting harder to come by. What I am really looking for is a very accurate load for long range shooting. I almost bought a 300 RUM instead of a 300 win mag but I couldn't justify the HIGH price of 300 RUM ammo and brass for the few hundred yards of bullet stabilty I would gain. Where I shoot and hunt at about the longest shot I will ever be able to make within reason with be no more than 1100-1200 yards and that is pushing it. I will probably try the newer 208g hornady A-max if the 178g or 190 don't produce the results I am looking for. Thanks again

zeb
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SWABBY56
Advanced Member



USA
690 Posts

Posted - May 07 2009 :  18:51:46  Show Profile Send SWABBY56 a Private Message  Reply with Quote
Zeb,
Years ago a friend of mine gave me a load for my 300 win mag. I have since then made it my hunting and target loads for that gun. It is 75 gr of Reloader 22, and a federal 210m primer or equivalent. Seated to an overall length of 3.410 inches. This load works well in my ruger for both the 165 and 180 grain nosler ballistic tips.

Good luck,
Swabby56
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OKIE2
Average Member

USA
103 Posts

Posted - Jun 18 2009 :  16:58:25  Show Profile Send OKIE2 a Private Message  Reply with Quote
This for 180's but should be very close
300 Winchester
180gr Ballistic Tip®, AccuBond® & Partition®
Ballistic Coefficient: BT&AB (.507) PT (.474)
Sectional Density: .271
* Most Accurate Load Tested

Powder: RL-22
Charge Weight (in grains) Muzzle Velocity (fps) Load Density
75.5* 3118 fps 98%
73.5 3023 fps 95%
71.5 2928 fps 93%

Powder: IMR4350
Charge Weight (in grains) Muzzle Velocity (fps) Load Density
70.0* 3130 fps 91%
68.0 3060 fps 88%
66.0 2990 fps 86%

Powder: AA3100
Charge Weight (in grains) Muzzle Velocity (fps) Load Density
73.0* 2925 fps 95%
71.0 2813 fps 92%
69.0 2736 fps 90%
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