Hi i.m a new reloader i have a 300 rum i.m loading with nosler 180 partition 87.0 of RL 22. First loading all good second loading I am getting cracks on the mouth of the Casing and blowing primers. The casings i.m using are Remington. Is this from using too much powder. Your input would be very much appreciated thank you
Help
- Thread starter TOMtumtum
- Start date
welcome to the forums.. I hope you got your load data from a reloading manual, as I don't load for the 300 rum. What you are seeing are excessive pressure signs. The gases find the easiest way out, usually the primer pocket or splitting the brass.
A quick search on some of the other forums voiced concerns about the rl-22 being hotter than published... Some folks suggest using slower powder such as H1000, Rl-25, or AA8700. Good luck, and work up from the minimum load in the manual in 1/2 grain increments, looking for the pressure signs that you experienced.
Cracked case mouths indicate work hardened cases. Cracks shouldn't be seen in a second load. Anneal the rest of your cases to start. Put 'em in a pan of water up to just below the shoulder, heat the necks and shoulders with a regular propane torch until the brass changes colour and tip 'em over. Dry 'em on a cookie sheet in your oven set on the lowest setting. About 15 to 20 minutes will do. Remember the ovens mitts when you take 'em out. Fingers getting burnt is only funny when it happens to somebody else.
Blowing primers is an excess pressure indicator.
Alliant gives 90 grains as the max load of RL 22 for a 180 grain bullet. So it's not the powder charge. How are you charging the cases? Either your scale or powder thrower is screwy. You might be thinking it's giving 87.0, but it's not.
It's best to carefully weigh each charge when working up loads.
Blowing primers is an excess pressure indicator.
Alliant gives 90 grains as the max load of RL 22 for a 180 grain bullet. So it's not the powder charge. How are you charging the cases? Either your scale or powder thrower is screwy. You might be thinking it's giving 87.0, but it's not.
It's best to carefully weigh each charge when working up loads.
MuleyMadness
Regular
- Location
- Kamloops, BC
Your load is within the 'book' values for the RUM but upnorth is right...you are seeing excessive pressure signs. You need to back your load off (I would suggest starting at 81 grains) and work your way up, stopping when you start to see high pressure signs.....and don't blow your fingers off by starting too high, all rifles are different in what they can handle and what kind of pressure a load will generate.
I.m using pay powder scales. And being a new reload or being very particular about the powder charge.
Biggunners
CGN Ultra frequent flyer
- Location
- MOSTLY LOSTED
Slow down , back off loads , check with chrono , see if you need that much velocity or change to H1000 , that's good enough for now and come for more if not corrected
Pudelpointer
CGN frequent flyer
- Location
- Lethbridge, Alberta
The Nosler manual (5th) has 87.0 as Max load. Did you work up that load or just pick it because the manual shows it as the most accurate? What primer are you using? Fed 215?
How far of the lands are you? Have you checked the accuracy of the scale? Try weighing a few bullets, they should be within a couple grains (the bullets are often a grain or so off) but should be fairly close.
If you are blowing primers you are way up with your pressure. Are you using standard Partitions or PT Golds?
How far of the lands are you? Have you checked the accuracy of the scale? Try weighing a few bullets, they should be within a couple grains (the bullets are often a grain or so off) but should be fairly close.
If you are blowing primers you are way up with your pressure. Are you using standard Partitions or PT Golds?
Switch to RL25, Retumbo, H1000, or one of the slower powders. Then follow all of the advice above. I shoot 207 gr and 220 gr bullets in my 300 RUM, no issues (and pretty fair accuracy for damned cannon) so far. - dan
