Just ordered the dies wanted to know if anyone has a favorite powder bullet combo for the 300 Wthby mag? Will the same powders used for a 300 win mag accurate load be a good place to start? I know each rifle is an individual and they like diffrent things but just wondering what some others are using. Thanks in advance
Posts: 156 | Location: NY | Registered: 30 December 2003
Find and old copy of the "weatherby Guide," usually available through the Collectors association of said rifle or on Ebay. In the back are some of the best loads for the 300. Admitedly they are over 20 years old, so some of the new powders won't be there. The best part however is it provide a "factory equivalent load" using Norma MRP powder which is what they use in their factory loads. I've tried them and they DO duplicate factory at least insofar as shooting to the same POI. A word of caution though. Use only Hornady or Nosler Partition bullets as those were the only two bullets available to them back then. If you use others, back off on the MRP and work up as ususal. jorge
Posts: 7149 | Location: Orange Park, Florida. USA | Registered: 22 March 2001
I load 84.5 grains of IMR-7828 behind a Nosler Partition, started by a Fed. 215 Magnum primer. I seat the load out to where it just fits in the magazine and I get 3/4" groups and 3220 fps. I cannot remember the exact COAL right now. Doug
Posts: 229 | Location: Asheville, NC USA | Registered: 27 February 2002
I used 7828 and Hornady 180 Interlocts in my Weatherby 300 and got 1.5 to 2 inch groups at 200 yards. Plenty good enough for me. Velocity was around 3100+ as I remember.
I have tried any number of powders in 300 Weatherby rifles but keep coming back to RL 22 with 180 grain bullets and RL 25 with 200 grain bullets. H 4831 and IMR 7828 are a couple of powders a guy should try if the Reloder powders do not give the performance desired in your particular rifle.
R F
Posts: 1220 | Location: Hanford, CA, USA | Registered: 12 November 2000
I don't have one anymore, but when I did it liked IMR 7828 under 180 and 200 gr. Nosler Partitions. It also liked Federal 215 and CCI mag primers. I don't remember the charge weight. Lou
Posts: 3316 | Location: USA | Registered: 15 November 2001
