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300 WSM Loads (Rookie Alert)

 
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  #1  
Old 06-26-2013, 11:45 PM
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Join Date: Nov 2011
Location: The Evergreen State
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300 WSM Loads (Rookie Alert)

I have recently been able to start making handloads for my McMillan 300WSM. I found several recomendations for 70-72gr of RL22 but i then read in a manual that there's a max load of 67gr with 190gr bullet. Can anyone help me clear the mud with this? I loaded a box with 70 gr of RL 22, do i have a box of potentially dangerous fireworks or will I be ok to shoot them? I'd hate to have to pull the bolt out of my face after shooting..
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Old 06-27-2013, 06:11 AM
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Re: 300 WSM Loads (Rookie Alert)

All rifles are different.My 300 WSM has a short throat and I would not be able to shoot your load.The best advice I can give you when working up your load is,load some more at lighter charges like 65.0grs and work your way up to the 70.0gr loads you have.Never,ever start with a max load!Mine is maxing out with 70.0grs of Reloader-22 with a 165gr bullet so I'd be in big trouble shooting a 190gr bullet with that load.
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Old 06-27-2013, 08:30 AM
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Re: 300 WSM Loads (Rookie Alert)

Never use an internet load without reducing considerably, book loads also reduce 5%.

Rifles can vary considerably in the powder charge they will work with without excessive pressure. Especially custom rifles with long throats,etc.Even starting book loads in some may show pressure. Also, powder lots vary somewhat.

I would back down to 3 grains below the book at least and go up from there in 1g increments. Once you find some pressure back off 2% or more.

Keep in mind temperatures-loads developed at say 50 degrees may be dangerous at 80 degrees.
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Old 06-27-2013, 08:45 AM
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Join Date: Dec 2004
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Re: 300 WSM Loads (Rookie Alert)

Quote:
Originally Posted by skookum View Post
I have recently been able to start making handloads for my McMillan 300WSM. I found several recomendations for 70-72gr of RL22 but i then read in a manual that there's a max load of 67gr with 190gr bullet. Can anyone help me clear the mud with this? I loaded a box with 70 gr of RL 22, do i have a box of potentially dangerous fireworks or will I be ok to shoot them? I'd hate to have to pull the bolt out of my face after shooting..
You have been giving very sound advice.Start low and work up and find out what the pressure limits are in YOUR RIFLE.Be safe and buy a bullet puller.
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  #5  
Old 06-28-2013, 06:25 AM
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Join Date: Feb 2012
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Re: 300 WSM Loads (Rookie Alert)

Mine too. Its starting to show pressure signs at 69 grains of re22 and a 165. Could be the guy that gave you those loads shoots a long action with the bullets seated way way out there. Even then it sounds like a pretty hot load.
Quote:
Originally Posted by baldhunter View Post
All rifles are different.My 300 WSM has a short throat and I would not be able to shoot your load.The best advice I can give you when working up your load is,load some more at lighter charges like 65.0grs and work your way up to the 70.0gr loads you have.Never,ever start with a max load!Mine is maxing out with 70.0grs of Reloader-22 with a 165gr bullet so I'd be in big trouble shooting a 190gr bullet with that load.
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  #6  
Old 07-02-2013, 03:44 PM
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Join Date: Nov 2011
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Re: 300 WSM Loads (Rookie Alert)

Once again the voices of reason and knowledge have spoken, thank you gentleman. I will be pulling the bullets off and trying again. I managed to find IMR4831 powder as well so i have some work and testing to do.
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  #7  
Old 07-05-2013, 10:40 AM
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Join Date: Feb 2010
Location: Alaska
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Reloader 17

I have found Reloader 17 to be most excellent in the 300 WSM
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