300 Win Mag load info

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FullDraw

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I'm looking for your ideas on a good accurate load for 300 Win Mag
I'm going to use 180 grain Speer Grand Slams & CCI primers,
Just want to know what powder to use and how much?

This load will be used in Browning A-bolts

FullDraw
 
YOu should buy a manual and if you haven't bought a whole herd of the grandslams, there are way better bullets available. I shoot a 168 gr TSX in mine, it runs out to just around 3200 fps, is very accurate and hard hitting. I load 75.5 grs of reloder 22 with a fed 215m primer and r/P brass and the OAL is .015 off the lands.
 
I have an A-bolt in 300WM and have had really good luck with IMR4831. Have tried H1000, H4831, Reloader 22, IMR4350 and others with varying degrees of performance but I keep coming back to IMR4831 in that particular rifle.
 
martinbns said:
YOu should buy a manual and if you haven't bought a whole herd of the grandslams, there are way better bullets available
Click to expand...

thats what I thought - why would anyone use the Grand Slam
 
Nothing wrong with the Grand Slam bullet. It has good weight retention, and good expansion for most velocitys over 1800fps. Good choice for the larger game animals for a calibre like the .300 Win Mag. JMHO
 
FullDraw, I think your best choice is to try either H4831SC or Reloder 22. Both of these powders give similar results in the .300 Winchester Magnum. Most people report the best accuracy and velocity somewhere between 75 and 76 grains of Reloder 22. Those are MAXIMUM loads, however, and may not work in all rifles.

Each time I start loading for a new .300 Winchester Magnum with a 180-grain bullet, I normally start with about 72 grains of Reloder 22 and work up to the maximum in one-grain increments. I agree that you should pick up at least one of the reloading manuals. In addition, you can get the basic reloading guides online from Hogdon and Alliant, so you will be able to get a good idea about how those powders perform, and what powder charges the powder manufacturers recommend for their own products.

These days, Hodgdon had downgraded the load for H4831SC by a few grains, due do the fact that newer lots of that powder burn a little faster than the older lots. I think they now list something like 73 or 74 grains as the maximum for a 180-grain bullet in the .300 Winchester Magnum. I'd heed that advice and start my load development from about five grains below max.

Other people swear by Hodgdon's H1000, so that might be a powder to consider, too. You'll be using 80+ grains of powder, however, if you go with H1000.
 
300 Win

Thanks for the info guy's I do have a speer manual, and I ordered a Barnes manual last night. I just wanted some feed back on what powder to use, there is lots listed in the Speer manual but I don't feel like buying them all to find out which one works the best I just want to narrow down the field. The Barnes TSX look like a good bullet from what I have read. I'm going to clear out the grand slams and give them a try;)

FullDraw
 
For what it's worth, both of mine (a Remington Sendaro and a Sako 75) like IMR 4350. When I bought my Sendaro (the first to arrive in Edmonton), I tried some 180 Rem factory. The rifle liked it, so I decided to try and duplicate the load. This rifle will shoot 3/8" groups (or better) all day with this load. The Sako will shoot sub-moa with the same load. I have also had a Remington ss laminate and a Colt Saur that shot very well although the seating depth was a little different. Premium bullets are fine, however I have taken bears, 3 Mule dear and a swak of Whtietails with this load. I have recovered 4 of the coreloks over the last 12-14 yrs and was pleased with their performance. I have thoght about trying some of the new "premium" bullets, however "If it ain't broke, don't fix it". I've known a nbr of ppl who have used Grand Slams and are very happy with them, if that's the route you take.

Don't overlook Speer, Hornady, or Remington bullets. The current need for premium (expensive) bullets seems to overlook the fact that these manufacturers have already been producing "Premium" bullets for decades.

While my choice of IMR 4350 is probably not the optimum powder for the cartridge it has served me well. Whatever your choice, check the internet, load manuals and other 300 owners for published loads and most of all....Enjoy your new rifle.
 
My Sako m75 SS 300WM loves to shoot 180gr Accubonds under 1/2" 5 shot groups using 74.0 gr of RL22. When I went up the next two 0.5gr increments in powder weight, the groups started to spread again. I too started loads at 72.0gr and had loads made up to 76.0gr but never shot higher than 75.0gr of powder. The performance of the Accubonds is incredible on big game...but to each their own. I may try some Retumbo in my 300WM to see how it performs as this powder works very good in my Tikka T3 LS 270WSM with 140gr Accubonds.
 
I'm just finishing up fireforming my 300 brass, factory rounds were used for last hunting season with a few sucessfull shots :D

I'm looking at using 200grn Nosler Balistic tips for my loads and either IMR 4350 or IMR 4831.

I was looking at reloader 22 as I have heard good things about it but as usual the powder selection at Wholesale was somewhat limited.

I used speer grandslams I think 175grn, in my 7mm RemMag and have shot a few deer with that set up, good penetration and I have only ever recovered on bullet, that was from a face on shot high in the chest that followed down the spine and smashed 7 vertabra before stopping. Good weight retention and good penetration. :)
 
I shoot with Hornady 180 & 200 gr and hunt with Nosler Partitions. The POI are very close. H4831sC has served me well.

I have recently developed the TSX 180 & 200 gr loads. But after hearing stories on the penciling effects, I am having a second thought on TSX. I can only kick myself at this point. There was no problem with the Partitions why did I spend the money playing with the TSXs. I still have enough Partition to last me the next 5 years. Maybe I just stay with them.

In your case, just go with what shoots well with your rifle.

Danny
 
I just loaded up a batch of powder loads using IMR8431 from 64-70grns in 2 grn increments.

Problem occured when I went to seat the nosler 200grn accubond (not balistic tips, I get confused with that little plastic tip)

bullets are so long that to try to get an OAL of 3.340 the bllets are too deep and are loose. Cant seat them that deep. So after checking the throat and mag I found that a 3.500 OAL works :)

Now if the blizzard would just finish blowing and snowing I could go out and do some testing.

I may need the saskatchewan nutz to return my target stand. thought the roof was going to come off last night
 
I loaded 180 Accubond's for last season and they worked very good, and accurate. I used 69grains of IMR 4831. I ordered from higginson recently and will be using H4831sc and trying H1000 as well.
The accubonds are long but so is the throat in my Remington, loaded to 3.595OAL :)
 
fozzy said:
I loaded 180 Accubond's for last season and they worked very good, and accurate. I used 69grains of IMR 4831. I ordered from higginson recently and will be using H4831sc and trying H1000 as well.
The accubonds are long but so is the throat in my Remington, loaded to 3.595OAL :)
Click to expand...


My savage has about the same throat but the mag will not fit anything much longer the 3.500" :eek:
 
For fulldraw,

When I ran out of room in the mag on my A-bolt, I grabbed a mag from a 375H&H, problem solved!
 
I'm a fan of 4831SC. It's an 'extreme' powder, so should be fairly temperature stable. It burns relatively cool, and folks report much better barrel life with this as opposed to 4350, or the double-based RL-22. Not that this is much of a concern for a hunting rifle (as opposed to a target gun)
 
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