Reloads for 300 win mag

[Jameson2001]

I have been trying to find the right amount of powder for my 300 win mag but I haven't had any luck. My groupings are about 2" to 3" at 200 yards and I have tried from 75.5 to 81 grains of IMR 7828 powder with 150g nosler partitions. I just can't get it down. I am looking for groupings of .75" to 1.5 wich I don't think is too much to ask. If you have any tips please let me know.

 

[500grhollowpoint]

What kind of gun? When you say you have tried from 75.5 to 81 do you mean you have tried both of those or several in between? Are you shooting from sandbags, front and rear of gun supported? What is the range for that powder in your book?

 

[maynard]

Is the action bedded and the barrel free floated? Have you tried different bullets and seating depths?

 

[c4pyro]

I don't know about other people but me and my buddy load with IMR 4350 and 4831 and both have had amazing luck with them.

He is using 71.5 grains of 4350, hornady 165 interbonds, 1/2 moa when he did things right.

I was using 72.2 grains of 4831 on sierra match 180's that would also should 1/2 if i didn't screw it up.

Both are slower burning powers and from people I have talked to that shoot 300wm, most people I have talked to use these or have a good load with them. Don' know if that helps you but give em a try if you like.

 

[Jamie]

mine really liked Reloader 22 and the 178 A-max

 

[Griffoneur]

I use 4350 as well, the accuracy is outstanding.

 

[ron hilchey]

my browning a-bolt will not shoot 150s nearly as well as the 200 sierras. even the 220rn. shot great with h4350. (65-68g) if i remember correctly.

 

[JasonYuke]

Mine with target loads will cut the same hole with Rl-22 and 178 SMKs
Rem Sendero!

 

[c4pyro]

Also, don't know your twist rate, but like everyone is saying your gun might not like the lighter bullets. I know that more often then not your twist in the barrel should be a 1-10 twist. Try 165's to 190's, might stable things out.

 

[Blackcloud]

I think this should be moved to the reloading sectio?????


However,


The 200Gr SMK is an easy bullet to get to shoot. Most gun seem to digest it well. Also, try H4831SC. Its a very stable powder and works well in 300WM.

 

[brobones]

I found from a little over 20 years of loading and shooting the 300 that they really don't care for the lighter bullets. They start to shine with projectiles in the 180 to 200 grain range. Best powder, for me, was IMR 4831. All 3 of them prefered a stiff charge too. I couldn't get the groups that I demand with lighter charges. My best accuracy came from a heavy charge of H 4831 with a 180 grain Nosler solid base. Next in line was the 190 grain Hornady BT. The 200 grain Speer is a spectacular performer too. I found that the 150's self destructed, as they were too fast and fragile to withstand impact at closer ranges.

 

[notenough]

168

I have a Tikka T3 HB Varmint that I shoot 168gr Speer HPBT Gold Match bullets in front of 71gn's of IMR 4350 and I get very good results all the way out to 800 yards, so far.

Start from the 165gr bullets and work your way up from there. If this is a hunting load your accuracy is already good enough. For target you can squeeze more potencial from your rifle.

 

[Woodsman]

I'm curious. What kind of groupings do others get with their rifle at 200 yards. 2 to 3 inch doesn't seem that bad... in a hunting rifle. Is this a bull barrel long range target rifle? Tell us all a little bit about the actual rifle.

 

[303carbine]

I have been trying to find the right amount of powder for my 300 win mag but I haven't had any luck. My groupings are about 2" to 3" at 200 yards and I have tried from 75.5 to 81 grains of IMR 7828 powder with 150g nosler partitions. I just can't get it down. I am looking for groupings of .75" to 1.5 wich I don't think is too much to ask. If you have any tips please let me know.

I would try a heavy bullet like the 190 BTSP or Match bullet.Shooting 150's a guy may as well shoot a 30-06.

 

[STAGCON]

I use 76grns of reloader 22, with a 180grn Barnes ###. I found this bullet shoots the best in my sako75.

 

[Big Guy]

My m-70 300 win. won't shoot those partitions to less than 2.5" switched to rem corelocks and the same load shrunk to sub 1"

 

[GunBoy]

Try Retumbo, Compress load with 79grain, 190grain BTHP, you should follow Hodgdon website, start at 73 grain to 78grain... I had great luck with this Combination.

 

[hardball]

I get really good results, sub m.o.a groups using 74.2 grs imr 4350 with a seirra 155 gr palma match bullet. I shoot this out of my mod 70 with douglas premium #7 taper barrel. Best group was 8.750" @ 1000 yds

 

[JasonYuke]

Mine loves, IMR 4350 or RL-22 and 180 gr bullets.
One of my lucky guns that shoots bad loads quite well, and great loads fantastic

 

[p-17]

I've always found 73 grains of IMR 4831 pushing a decent 180-grain bullet to give excellent performance in any .300 Winchester Magnum I've ever tried. That usually gives speeds in the range of 3,000 fps and accuracy of 1 m.o.a. or better, assuming the rifle is basically accurate.

Having said that, my hunting rifle is a Sako L61R Finnbear with a 22.5 inch skinny barrel. To date, I've found the best load to be 77.5 grains of Vihtavuori N560 pushing a 180-grain Nosler Accubond out of a Winchester case, sparked by a CCI 250. This combination gives me, easily, 1 inch groups at 200 metres, for the first three shots. (I don't bother trying more than 3-shot groups out of a skinny hunting barrel.) It also gives me a solid 3,050 - 3,070 over the chronograph, which is higher than any other load I've put through this short barrel.

Last year this rifle absolutely flattened a mule deer at a lasered 250 yards down a steep canyon. The bullet landed in the exact spot where I held.

I don't plan on changing this hunting load any time soon.