300 Weatherby 200 Grain Accubonds and H4831sc

[Mike_W]

Looking at starting some load development and getting kind of confused between what I am seeing on Noslers site and what I am seeing on Hodgdon's site.

Hodgdon list max loads for most powders less than Nosler does by as much as 4 grains Hodgdon lists max for H4831 @ 75 grains and 54,400 psi while SAAMI is 65,500 psi and while Nosler doesn't list H4831 for the 200 grain bullet it does list it for 220 grain bullets at 76 grain max now typically as bullets get heavier and longer charge weight goes down for example Nosler list H4831 at a max of 82 grains for 165 grain bullet in the 300 Weatherby.
So would it be safe to say that I could run at least 76 grains of H4831 with a 200 grain bullet.

Obviously I will start lower but hate working with "unpublished" powders.
Also I should mention my COAL is my max clip length which is 3.725" 0.200" off the lands.

Thoughts?

Mike

[elkhunter11]

Do not assume that Hodgdon is loading milder, just because the pressure number is lower. Hodgdon does not list their pressures in PSI, they list them in CUP, which is a different unit of measure.

[Huntnut]

I've always had more luck in my weatherby's with 7828 & 7828scc

[Mike_W]

Originally Posted by elkhunter11

Do not assume that Hodgdon is loading milder, just because the pressure number is lower. Hodgdon does not list their pressures in PSI, they list them in CUP, which is a different unit of measure.

Nice catch thanks for that I am still confused where to start as Hodgdons max loads is Noslers min load.

Also what difference does having a longer COAL vs Spec COAL? more, same or less pressure? Again still seating .200" off the lands but still .165" longer than spec.

Thanks

[elkhunter11]

Personally, I would be starting with the Hodgdons data, as there seems to be some irregularities with the Nosler data for the 300wby using 200 gr bullets. They have the maximum load for IMR 4350 higher two grains higher than the maximum load for IMR 4831, which is a slower burning powder. To me, that doesn't make sense at all. Checking the Sierra manual, the maximum load for IMR 4831 is just under 76gr with 200 gr bullets, and H4831 isn't all that different. Based on all of my data, I would be working up from around 72 grains, expecting to max out at 75 to 77 grains.
As for the COL effecting pressure, I don't find that it's much of a factor, until you approach the lands, where increasing the COL, usually increases the pressure. As for the COLs listed in the manuals, I tend to ignore them, and load according what shoots best in my rifle, and what fits the magazine.

[Mike_W]

Originally Posted by elkhunter11

Personally, I would be starting with the Hodgdons data, as there seems to be some irregularities with the Nosler data for the 300wby using 200 gr bullets. They have the maximum load for IMR 4350 higher two grains higher than the maximum load for IMR 4831, which is a slower burning powder. To me, that doesn't make sense at all. Checking the Sierra manual, the maximum load for IMR 4831 is just under 76gr with 200 gr bullets, and H4831 isn't all that different. Based on all of my data, I would be working up from around 72 grains, expecting to max out at 75 to 77 grains.
As for the COL effecting pressure, I don't find that it's much of a factor, until you approach the lands, where increasing the COL, usually increases the pressure. As for the COLs listed in the manuals, I tend to ignore them, and load according what shoots best in my rifle, and what fits the magazine.

Thank you elk! This pretty much answers and clears up what I was thinking!!

Thanks a bunch
Mike

[Mike_W]

If anyone can add from other reloading manuals like Hornady, Lyman or Speer that would be great!!
Thanks
Mike

[peakseeker]

from hornady #8. 300 weatherby 190gr. bullet. h4831 min. 69.7 max. 78.4gr.
220gr bullet. h4831. min. 66.5 max. 74.7gr.

[Mike_W]

Originally Posted by peakseeker

from hornady #8. 300 weatherby 190gr. bullet. h4831 min. 69.7 max. 78.4gr.
220gr bullet. h4831. min. 66.5 max. 74.7gr.

Thank you what are they giving for velocity from the 190 with 74.7 grains?

[elkhunter11]

Thank you what are they giving for velocity from the 190 with 74.7 grains?
__________________

74.7gr is the load for the 220gr bullet.

[Mike_W]

Originally Posted by elkhunter11

74.7gr is the load for the 220gr bullet.

Yes sorry I meant 78.4

[Huntnut]

Lyman manual-200gr A-Frame-H4831sc-min.73.5gr-max-77.5gr

Speer#14-200gr-H4831sc-min.-72.5gr-max-76.5gr.