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Reloading Techniques For Reloading


300 WSM Loads (Rookie Alert)

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Old 07-10-2013, 02:07 PM
Bronze Member
Join Date: Nov 2011
Location: The Evergreen State
Posts: 43
Re: 300 WSM Loads (Rookie Alert)

I tried 66gr of RL22 with 190 gr sierra and barely shot MOA, the rifle is capable of half that so its back to the drawing board, i bought an OAL gauge and i think that will help. waiting on sportsman's to get some H4350 and maybe some different slugs as well.

Audaces Fortuna Iuvat
"Fortune Favors The Audacious"
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Old 07-10-2013, 02:14 PM
Silver Member
Join Date: Feb 2010
Location: Alaska
Posts: 332
Re: 300 WSM Loads (Rookie Alert)

I consider the 190gr alot of bullet for the 300 wsm case

Suggest 180 or better yet 165/168

For powder

RL 17 tops in vel
RL 19 a close second
W760 duplicates win loads
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Old 07-10-2013, 06:25 PM
Gold Member
Join Date: Feb 2012
Posts: 804
Re: Reloader 17

17 IS THE POWDER in my buddys wsm but mine just doesnt do that great with it. I get my best groups with h4350 and h4831sc. Mine seems pretty primer sensitive too. I does ok with about any standard primer, real good with fed match mags and terrible with cci or ww mag.
Originally Posted by alaska View Post
I have found Reloader 17 to be most excellent in the 300 WSM
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Old 07-10-2013, 07:08 PM
Silver Member
Join Date: Feb 2010
Location: Alaska
Posts: 332
Re: 300 WSM Loads (Rookie Alert)

Imr 4831 also good
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Old 07-10-2013, 08:20 PM
Platinum Member
Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 5,954
Re: 300 WSM Loads (Rookie Alert)

Skookum, do you understand the concept of starting low and working up?

Reloading manuals are good references but you will differences between them, sometimes significant differences but they are a good starting point.

That said, there is very little to no published load data available for many powder/bullet combinations. What I do in that case is search for all the online data I can find and look for trends to find a good starting point. I usually like to start at least 10% below known max charges and work up in .5 gr or full gr increments (depending on case capacity). For the WSM, I use .5 gr increments.

As you work up, look for pressure signs. That is a tricky art, so I would recommend reading everything you can find on pressure signs. Knowing the burn rates of various powders and how they act with particular bullets and cases helps a lot.

Once you find what your max working charge is, then you can experiment with different bullet seating depths and load charges to find which are most accurate in your rifle.

I found RL17 to give very good velocitiess in my 300 WSM. My max was 67.5 gr fro 180 E-Tips. I would recommend starting @ 61 if you try it.

I have to disagree the WSM does not shoot heavier bullets well. A lot depends on whether or not you are shooting a long or short action and how deep you seat the bullets, etc. I got 2935 fps with 210 Bergers and RL17 in my 300 WSM.

Hope that helps
- Mark

You will never know how much it has cost my generation to preserve your freedom. I hope you make good use of it.
~ John Quincy Adams
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Old 07-11-2013, 09:43 AM
Silver Member
Join Date: Feb 2010
Location: Alaska
Posts: 332
Re: 300 WSM Loads (Rookie Alert)

Reloader 17 very good powder in the 300 wsm the new Berger elite bullets should be most excellent in the 300 WSM
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Old 07-11-2013, 11:43 PM
Silver Member
Join Date: Jun 2012
Location: OR
Posts: 108
Re: 300 WSM Loads (Rookie Alert)

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..
Yes, they may be dangerous.
I know every gun is different, but Right out of the boxm I was shooting sub MOA with RL22 and 168 gr sierra's.
I'm now working up loads for it with Barnes bullets. We'll see how they do.
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