Originally Posted by bsa1917hunter
Originally Posted by shrapnel
Originally Posted by anothergun
7828 going once, going twice………….

How is it temp sensitivity wise ?

One other thing...20 years ago a guy told me get a Weatherby and forget it. At the time I was just getting into shooting and hunting, and my father in law shot a group he covered with his thumb, that his Rem 722 .222 rem made. So from there I struggled through trying to make my 200 dollar rifles shoot. Did I have to buy a 1500 dollar Mark 5 ? No. I bought, back in '14, a Vanguard, 300 Weatherby, synthetic stock, two lug bolt that was too easy to load for. My Winchester M70 shoots well, but I can't seem to fire form that easy.

Question.. According to SAMMI the case head to datum on the cases for the 300 is 2.3857 + .008 ? = 2.394 base to datum fireformed or minimum HS ?

Don’t let the internet get to you. Most of what you read is irrelevant. I have hunted my entire life with all sorts of guns, modern and antique and never checked datum. As a matter of fact, I never even heard of datum.

Full length resize your brass, watch for the incipient case separation that was mentioned earlier and load up your 300 with 7828 and your favorite bullet. It will work and the weather won’t affect it enough that you or the elk will ever notice.

Before you go hunting, run all the ammunition through the action that you are taking with you to make sure you don’t have any tight cases that may interfere with the cycling of your action when you are shooting. The 300 WBY can stretch the case enought to make it hard to close the bolt even with the gun you first fired it in…

Good post. I often see and read about temp sensitivity. My best suggestion is to work up your load in the fall/winter months. Around the same temps you intend to hunt. Absolutely no issues or concerns doing it this way. Most of us are not going to be hunting elk in the summer time. The LRX load I worked up for my 300wby rifle was worked up in late October (right before elk season). Temps were in the 30's:
[Linked Image from i.imgur.com]

Then after double checking poi and accuracy after replacing the stock:
[Linked Image from i.imgur.com]
Temp was in the 40's, so little to no difference in accuracy.


I tend to work up all my elk hunting loads in cold weather. The matching pre 64 338wm to my 300wby that shot those groups above:
[Linked Image from i.imgur.com]
Same thing. Never worried about my loads worked up with so called temp sensitive powders. I run a lot of IMR4350 in my 30-06's without worry as well. The obsession about whether it's "temp stable" or "temp sensitive" should be left to the varmint hunting rigs, not elk hunting rigs. Generally speaking..

IMR 4350 is one of those temp powders. I don't usually load in the summer months anyway. My 06 and 270 like 4350.