reloading 300wsm

graperunkennels · 01-10-2005, 08:22 PM

just bought a winchester m70 300 wsm and was wondering if anyone was reloading for it yet, if so whats working the best. probably a nosler partition but not sure on powder

Superpig · 01-11-2005, 08:36 AM

Accurate Arms has a powder designed specifically for the short mag family of cases. The powder is called MAGPRO. I have seen a few fellows at the range that rave about the velocity and accuracy they get using this powder. On bullet selection any controlled expansion bullet should work well. Using MAGPRO in a 24" barrel should garner 2950-3050 fps with a 180 gr. bullet. I would look to the Nosler Partition in 180 gr. or the Barnes X in 165 gr. I would stay away from the ballistic tip and go with the AccuBond if you are looking the a polymer tip bullet. I think the lightest bullet weight I would consider for hunting would be the 165 unless you are planning on shooting Pronghorn at long distance then the 150's should be fine.

oldelkhunter · 01-11-2005, 09:03 AM

If your looking at 180 partitions or ballistic tips H4350 and 65.5 Fed 215 primer is nonfallible in most 300 wsm's i have loaded for..work up to it slowly. Reloader 22 is supposedly another good powder have not tried it yet. .

duramaxlt · 01-11-2005, 06:49 PM

i've chronographed all the wsm calibers they all met are exceeded published speeds with factory ammo.these are the only cartridges i've seen do that,i don't own one so i haven't done any reloading i'm curious is it hard to bet the speeds for factory rounds rolling your own.they load these things hot.

Gundigest · 01-12-2005, 07:16 AM

Try the reloading forum, you will probably get more replies.

graperunkennels · 01-12-2005, 08:16 PM

I've had people tell me you cant beat the factory loads on the 300wsm, but i have reloaded for a while now and this is my first magnum rifle so i want to see what i can do with reloads. thanks everyone

oldelkhunter · 01-13-2005, 08:21 AM

You can match the factory loads pretty easily and in some cases beat them. I haven't used Magpro yet on the 150 grain bullets but it supposedly matches ballistics as well when used. Try WWW.Reloadersnest.com

swisslake · 01-13-2005, 07:03 PM

I have a Win mod 70 in 300WSM & have worked up 2 different loads that are equal to or slightly better than factory. The first is with a 180 gr fail safe with RL 19. I killed Bison, black bear & mule deer with this load. The second is a 165 gr Swift Aframe also with RL 19. I took this load on a dall sheep hunt but wasn't fortunate enough to kill one. I use Norma brass & CCI mag primers. While working up loads for this my gun seems to shoot better as the loads get hotter.

NO_GILLS · 01-14-2005, 12:03 PM

I just started reloading the .300 WSM also. I am loading Win brass CCI 250 primers IMR 4350 powder and Sierra 165 SBT. Sierra says starting load is 58 grains of 4350, max is 66gr. chrony 2950-3150. I got .6" group of 6 rds at 100 with the 65 gr load and .5" with the 60 gr load. This was out of a Savage Mod 11
Havent loaded any other brand of bullets yet. let me know if you find a better one!