All,

I am starting some loads using the Barnes 180 gr. TSX and 4350 powder for my 300 WBY. As the data is somewhat scarce, any and all loads that you guys may have with these components as a starting point is greatly appreciated.

Which 4350? Good luck.

If you want to achieve max velocity out of the 300 WBY you need to buy some RL22, H1000, or RL25. Any of the 4350's burn at too fast a rate for the 300 Wby. I'm not saying you can't use it you will just have better results with a slower burning powder in a case the size of the Wby.

IMR7828,H-1000 and R-22 have worked best in the rifles that I have loaded for.Either 4350 is too fast for thebest velocities.

I shoot 180 gr nosler partitions in my 300 weatherby but using the barnes is no different, you can use the following 180 n part--federal gm215m primers---80 gr h4831 gives me 3005 on the chrony.

If you can get your hands on some Norma MRP, you can push a 180 gr. bullet 3,297 f/s; 4,359 ft/lb. Good luck.

All,

Thanks for the replies. Unfortunately, I have a "sweet spot" for IMR 4350 (as in I have 8 more cans of the same lot left!), so I am somewhat "stuck" with it. As far as the type of 4350, it is IMR. I am currently without a chrony and was trying to get a feel for loads while I prep'ed my bras.

According to "Barnes Reloading Manual Number 3" forthe .300Wby. Mag. a 180 gr. XFB and XBT using IMR 4350 MIN: 71.0 grs 2846 f/s; MAX: 76.0 grs. 3046 f/s. Don't forget th start at MIN. Good luck.

Some early 300 WBY 180-grain factory ammo was loaded with IMR 4350, but it was very hot pressure-wise. Actually, 4350s are altogether too fast for most 30 caliber magnums, and especailly so for ones like the Weatherby or RUM. You'd be well advised to use a slower powder, including possibly IMR 7828 in addition to those listed in other responses.

I agree completely - but sometimes IMR 4350 can give great groups in .300 Win/.300 Wby, and only comes in a hundred fps or behind the slower powders. The same scenario sometimes exists with the 7MM Rem Mag.- particularly with the shorter (24") barrels.