HELP ! Reloading for ruger 300wsm

[Jmurph]

I could use some opinions or suggestions on what worked for you.
I have a ruger 300wsm and I am trying to reload for it but I am having a little trouble finding a recipe that shoots satisfactory . I want to shoot a 150g bullet . I have tried several kinds and different seat depths with the bullets . I like to use
Win760 powder ,but am open to suggestions? HELP !

 

[contender]

When I start loading for a totally new caliber & all, I study as much info as I can from several different manuals. Most will have a commentary about what combo was the most accurate etc. And, as you read more & more, you will see a pattern of similarities in components that perform well.
That's where I start my load experimentation.
I select a bullet weight & design I want to use. Then I select a powder that keeps getting the accuracy nod. Then I work from there. Starting at the low end of the loading charts, and working up.
For hunting type rifles, I usually prefer a .050 distance from lands to bullet contact for seating depth.
If after all that work, & I do not get the results I want, I start over changing bullet design or weight.
Quite often, I get excellent results the first time around. However, if none of that works, I back up & restudy to see where I can improve something.
I also suggest getting a box of premium factory ammo to fire before attempting any reloading. A box of 20 rounds, fired in 4 groups of 5 rounds each, over 4 different shooting sessions will give me a baseline of accuracy to try & beat.
Unfortunately, I do not have any direct info for your chosen caliber. Sorry. I hope my methods offer some help though.

 

[Jmurph]

Thanks.... That is actually what I have been trying started with a factory Winchester supreme ,measured o-give and oal and started there. Everything is new and quality stuff ( scope,rings etc ) but I haven't ruled out problems there. Going to start over and try again

 

[Laserbait]

What kind of accuracy have you been getting?

Sometimes changing one thing can help a lot, like:

Crimp with a taper or roll, or even, no crimp.
Change the primer make, or even to a non magnum primer.
Deburr/uniform the flash holes.
Change to full length resizing, or neck sizing the brass.

Weigh your brass, and sort it by its deprimed weight. Depending on how many pieces I have, I either cull the extreme ends, or I'll load them up from lightest to heaviest.

You might also have a generous/oversize chamber. I have a Savage 10FP that is slightly long, and will digest ammo that my friends Ruger Gunsite will not chamber, and it's not as accurate as the Gunsite either. I need to get it in somewhere to have it looked at, I think it needs a headspace adjustment.

 

[Jmurph]

I am getting about an 1-1/2---2" group at 100yrds. I have tried varying my charge from starting charge to 1/2 grain off max... Seems to do better on the low side with bullet father from lands.. 30-40 ths out.. I'm using 64-1/2 g of win760... And also tried imr4350

 

[sourdough44]

If I'm testing for accuracy I often load up some match bullets. Why not try some 168 grn Sierra matchking bullets? If you want to stick with a hunting type bullet I'd see what 165 grn Gamekings will do.

I only loaded a few loadings for my 300WSM, some reduced loads with H-4895 and hunting loads with H-4350. The 4350 loads were with 165 & 180 grn bullets, the reduced loads with 150 grn.

When shooting groups other factors are important too, scope magnification/quality, shooters ability, trigger & the rest.