If you are shooting 180 and above class bullets, Retumbo and H1000 are excellent powders. FTX® (Handgun) Additional Data Sources Obsolete reloading data.
I'm going to reload a 200gn Barnes tsx in a 1-10 twist 300 win mag using H1000 powder. also use those powders. # So, that's pretty consistant data. Getting a 300 win mag and would like to load H-4831sc with it as I already use that powder for my .270 win. FTX® (Rifle) 41 Remington Magnum 190 gr. Just want to see if anyone is using these powders. of course I am going to work my load up. Hey guys you are always a great help. 300 Win Mag load development with the Thompson Center Compass using the 220 gr Nosler Custom Competition and Hodgdon H1000. I have not shot a .300 Win. Based on the article, I loaded up 3 loads for my 300 win mag. However, those powders were always good when I did.

Also I deviated from the article in that instead of doing two 3 shot groups, I did one 5 shot group for each load. I am quite sure that the new RL powders, like RL-23 and RL-26 should work very well too. Others I know who still shoot a .300 Win. in awhile. If you only have 200 bullets, then that's right at 2 lbs of powder, which you have. There is a big gap between min and max load. I have 3 powders I am going to use IMR 4064, IMR 4831, and IMR 4350. Mag. Up to this point finding a Low SD load has proven very difficult. At first I'd load for deer but hoping for an Elk hunt one day and would like to be ready.
Obsolete reloading data that has been retired from our Handbook of Cartridge Reloading is available. 300 PRC 178-250 gr. # IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data. Hodgdon's website is pretty close to what you will find as your max. The article shows 4 but I already had data on one of the lengths so I didn't need to do that one again. Wondering if any of you guys load this and any load recipes would help? I am looking for a good recipe for 300 Win Mag for 150gr Interlocking SP & 165grn SP. ELD-X® 41 Remington Magnum 190 gr. data **includes new A-Tip™ Match load data; 338 Lapua Mag 270 gr. If it works out it would keep things simple. For magnums with light- to medium-bullet weights, IMR 4350 is the best choice. We implement the Scot Satterlee load development data that we generated previously and use that information to choose our test loads in our journey to find a great load for our Thompson Center … IMR 4350 is a medium- to slow-burn rate propellant and is the number one choice for the new short magnums, both Remington and Winchester versions. If it didn't work out I can still use the powder and there's always room on the shelf for another powder. Sierra says 73.8 and Hodgdon says 74.0 as a max. Re: 300 win mag load with 4350 I would look at using IMR4831, instead of the H4350.