300 Win Mag help needed

[warski]

I have several hundred cases I want to reload. The Remington Premier AccuTip is the most consistent round in my rifle and I would like to copy it. I can buy the Reminton 9 1/2M primers and the 180gr AccuTip bullet, but I have no idea if I can copy the powder charge.

Does anyone know what powder I should use to exactly or closely match the factory round? How many grains?

Other suggestions? My main concern is to be able to rely on shot-to-shot consistency on 200-300 yard shots and knockdown power on elk.

 

[rcmodel]

Nobody can tell you what powder Remington is using except Remington, and they won't tell you.
And even if they did tell you, you can't get it anyway.

As close as you can come would be to match the velocity with a chrnograph as closely as possible.
But even that would not mean your reload would shoot to the same zero or as well.

What I would do is as you suggest.
Get the bullets, and work up an accurate load using whatever powder you pick out of a reloading manual. Any number of available powders will probably work as well as what Remmy is using.

Brand of Primers is unlikely to make any differeance you can tell.

rc

 

[flashhole]

You can also use one of the factory rounds to set up the seating die. It sounds like you have ammo that shoots well and finding the correct seating depth can take some doing.

 

[warski]

Thanks, I have two left, I'll save them for measurements. I bought the Hornady O.A.L. gauge and the modified casing, I'll compare the measurements with ammo I know works well.

I didn't think I would be able to match the powder exactly as it is probably proprietary or even a blend.

I don't have a chronograph, I was hoping that someone here had already done that work and would save me some trouble. I'll try another approach with google to see if I can find published velocity data. I really don't want to buy several powders and spend a year finding a load. If I can just get them to shoot consisent, I can adjust the scope...

 

[243winxb]

Take apart a factory round. Weigh the powder. Most i have looked at are IMR type powders. Remiington/Dupont were one in the same years ago.

The slowest burn rate IMR powder, IMR7828, was made available to reloaders in 1985. Prior this powder was only sold to commercial ammunition companies. The demand from reloaders for powders up to the task of modern cartridge and bullet designs brought about the availability of IMR7828. Today, IMR 7828 continues to be the standard for use in large-caliber and magnum performance rifle cartridges.

http://www.imrpowder.com/history.html All this means nothing, only the factory knows.

 

[warski]

Thanks!

By picking a couple of cartridges to compare at the Remington site I was able to find that the rounds that I like have a published muzzle velocity of 2960fps. I have a couple of manuals, I should be able to find a load fairly quickly now.