I'm thinking about trying Magnum powder in my 300 Win. Mag. with 180 and/or 200 grain bullets.
If you have any experience with this powder, I would appreciate any information you might have.

Thanks for your time.

It will actually out shoot my RL25 load for 300 rum with 200 gr Accubond. Its about 100 fps slower and the group size with RL25 is small to begin with. I'd not hesitate to use it if my supply of RL25 dwindles...which it could. I'd start with starting load just to see where you are with velocity compared to what your supposed to get and start working my way up in charge weight until you get to your target velocity (as listed) (+ or - for difference in bbl length) or your gun tells you when enough is enough ie--pressure signs. Accuracy came in for me as I approached the upper end not right at it.

I have used this powder in my 264 mag and 270 wsm. I worked up a load in the 264 using the 120 gr ttsx bullet, it is the most accurate bullet/powder combination that I have found so far. The 270 wsm is a different story, I worked up two loads using the 150 gr nosler partition and the 150 gr Barnes X bullet, with this load combination I was getting good groups and good velocity (2980 fps) but when the temperature dropped to below 60 degrees I would lose about 80 fps velocity. If you want to try this powder I would suggest that you use the hottest primer available, either winchester magnum or federal magnum primers. This is a slow ball powder, good luck.

Meters excellent. Several sub-inch loads and the most accurate powder across the board in my 8mm remington mag. Haven't had time to try it in anything else but I am pleased.

Freddy, what was your load in the 264 with the 120 TTSX, please?
BBerg

I use magnum in a browning ss x-bolt 300 win mag. Max load is at 3130 avg with 180 partitions and moa at 100yds.

Thanks for your help so far, I really appreciate it.

byd, How much Magnum are you using with the 180 Partition.?

Thanks

I started with 62 gr and stopped at 68 gr, I got the data from Barnes, 69 gr is book max, if you need assistance give them a call, they are very helpfull.

68 gr Ramshot Magnum
Winchester cases
120 gr Barnes ttsx
Winchester large mag primer
Extreme spread 25 fps
Standard deviation 11 fps
Average muzzle velocity 3268 fps
Winchester Pre 64 M 70 with 26 inch barrel

Groups were running about 1 1/8 inch,by some peoples standards those groups may not be satisfactory but considering that I was getting 1 1/2 to 2 inch groups with other powder/bullet combinations that is an improvement as far as I am concerned.These loads show no signs of pressures in my rifle, but as always start low and work up, good luck.

Not that it helps you a bunch, but Magnum showed good promise (before winter slowed me down and I switched barrels for a while) in my .264 WSM under 129-gr Hornady SSTs. Meters nicely, too.

80 grains avg. 3050
81 grains avg. 3100
82 grains avg. 3137
26 inch barrel

I now have 2 lbs. of Ramshot Magnum. This should be enough to get me started.

Thanks again for the advice.

Freddy,

You say you stopped at 69gr that gave you good accuracy at 3,268fps... How close do you feel you were to maximum load?

Mule Deer has a favourite load of 69gr behind the Speer 140gr bullet for 3,200fps+ which would make me think 3,400fps would be safely attainable with the same powder and 120gr bullets.

BBerg

For my rifle I would say I was close to maximum, Barnes says 69 gr is max, they got 3303 fps with max load. When I worked up this load I used a different method than I ususally do when I work up loads. Nosler recomends this method, I took some factory winchester 140 gr power point rounds and pulled the bullets and discarded the powder and primers. I then replaced the primers, powder and bullets, and worked up the load starting with the starting load, I fired a factory round first, then I fired all the rounds that I had worked up in 1/2 grain increments, after I fired the 68 gr load I fired one more factory round. I went home and measured all the rounds on the belt, the 68 gr load expanded .0002 less than the factory loads. I measured all the rounds before I fired them, they all measured the same. Nosler swears by this method however you need some factory rounds on hand and we both know that factory stuff is very expensive. Barnes say to work up the loads and stop and back off a grain if expansion on the belt reaches .001. You have to remember that not all rifles are alike, a safe load in your rifle may not be safe in someone else rifle and vice versa.

In my limited experience, Magnum at pressures around 50 - 55KPSI are scary, scary consistent. FWIW, Dutch.

Thanks Dutch, for the PSI info. I will start loading for this in the A.M.
200 grain NAB and Partition
180 grain NAB and Partition
180 grain T-TSX

That should keep me busy for a few days.

Merry Christmas