I routinely use Hornady .411" 300 grain SP in a 450/400, which should have .410" bullets with no problems. They are very accurate.

 

It may have worked. Did you already send them back?
GH1

 

it would have worked. I have some older loading books

 

I did not send 'em back. In fact, I haven't got 'em yet. Do you have any load data? Remember, my barrel slugs at .320. If you have some load data I will give it a shot (pun intended). My Winchester is the modern John Wayne model. Just a shooter. A pretty one....but just a shooter.

Thanks.

 

Well, just for kicks before I sent these bullets back I sent an email off to Sierra Bullets. I've contacted them a few times in the last ten years for some questions that had perplexed me and have always found their "bullet guys" to be very knowledgable and very helpful. They will answer your questions even when it doesn't pertain to their bullets. Hey...if that doesn't get you to buy their bullets...I don't know what will. (I do buy Sierra bullets whenever they fit the "need").

Anyway....I'm glad I did as this was their response:

"Just start with a beginning load, and work up carefully, checking for pressure signs.
I found a load for the IMR 3031 and the IMR 4198.

IMR 3031 Starting load 25 grains……………….Maximum load 28 grains
IMR 4198 Starting Load 18.8 grains……………Maximum load 22 grains"

So....now I have a few loads to work on!! I'll load a few up and post the results for those few 32-40 reloading guys out there who are also searching for load data.

FWIW