Nosler - Possible MISPRINT for 180 grainer for 300 Weatherby

[tapehoser]

I spawned a thought just now (I know...doesn't happen often) because I'm taking these loads shooting on Monday.

For my 300 Weatherby, my go to load has been a 180 grain Nosler Partition over IMR7828 SSC.

Nosler manual
80.5 - 84.5 grains of IMR7828

IMR manual(same bullet)
72.5 - 80.3 grains of IMR7828

I don't know about you, but I think that's QUITE a span. And the fact that the Nosler MINIMUM is the IMR MAXIMUM??? A little scary, I think.

So what should I do? I have shot the loads from the Nosler manual before but wonder if I'm entering dangerous territory?

 

[remingtonman_25_06]

I would load 1 round each at 79, 80, 81, 82, etc.. till you get a sticky bolt. Then you know your pushing MAX for your rifle.

 

[Zeke Menuar]

The Nosler data is right in the ballpark with the Speer manual.

I'd be suspicious of the IMR data.

ZM

 

[tapehoser]

I have loaded 5 rounds of each of the following charges: 80.5, 81.5, 82.5, 83.5 and 84.5. I will try to get out and shoot them tomorrow and let y'all know what I find.

 

[kraky]

Because there are alot of guns out there that aren't set up like a weatherby (with freebore) alot of mfg's have down graded the load data. Also.....when using rem brass you'll find alot less case capacity than weatherby brass. Bottom line for me is that with weatherby brass and and weatherby rifle you should be able to do 85 grains real ez....on the other hand if you had a rifel without freebore AND you used rem or hornday brass you might very well max out at about 80-81 grains.

 

[tapehoser]

My rifle has TONS of freebore. It is a Model 70 Winchester. It would be absolutely impossible to EVER reload any bullet that would even come CLOSE to the lands of my rifle.

Anyhoo...

I am also using 75 pieces of Weatherby brass, about 50 Federals, and another 50 Frontiers.

 

[Reloder28]

I load 84.5 gr IMR 7828 in my 300 Wby. I am dying to try the 7828 SC (in my 7mm Wby) My load gives me 3250 with 180 Grand Slams from my 26" SSK barrel. I think I'll leave this alone and continue to use regular 7828, I think 3250 is plenty fast for a 180 gr.

 

[tapehoser]

Went out and shot 'em all today.

The best grouping came from the 80.5 grains of IMR7828 SSC. Group was just over an inch. Not that great, but then again, I'm relatively new to rifles.

OAL was 3.600 on all rounds in each group.

Now I will try and tweak the seating depth to see what it likes more.

Oh.....and no signs of pressure on ANY of the rounds - all the way up to the 84.5 grainers!

 

[remingtonman_25_06]

Maybe try .5g increments more then 84.5g. There is always 2 accuracy nodes with a certain bullet/powder/primer combo. ITs a low velocity and high velocity accuracy node. I"m not saying go over the book if you dont want, but it does not hurt to find your own rifles MAX load. I have found several of my loads shoot better over the stated max in many books at a higher velocity accuracy node. I strive for top velocity and accuracy in my rifles, why settle for mediocre velocity when you can get full throttle and accuracy? It might tighten up your groups a tad, it might not, never hurts to try.

 

[remingtonman_25_06]

Oh I also forgot that you can miss a complete accuracy node by 1g increments. Thats why I recomended .5g. See my post on my .270 with RL-22. I loaded up 3 loads each at 57g, 57.5g, and 58g. Well 57 and 58g both gave 2" groups at 200 yards. Not to great, but not all that bad. But 57.5g gave .5" group. So it never hurts to fine tune a load by trying .5g increments. If I woudl have went 57, 58, and 59. I woulda missed that 57.5g load and woulda never saw how accurate it was. Just something else to think about.

 

[Reloder28]

Forgot to mention, the load I listed above shoots 1/2" in my gun.

 

[FOTIS]

My standby for the 300 WBY was always 85 gr of 7828 with the 180's.

 

[FOTIS]

and 83 gr 7828 with the 200 grainers.