quickload for 300 norma mag

Wow!

I know only of 1 person who has a 300 Win Mag. He very seldom shoots it due to recoil. He does hand load for it using IMR4350 I think. Don't know what weight bullet he's using.

I have a heap of 300 NM once fired brass (that I shot) I tried to sell it awhile ago with zero luck, here or other places. There seems to be little interest in the cartridge in general. Even the military is reevaluating it despite it being the intermediate cartridge for the ASR system. The 300PRC appears to be outperforming it for that application.

I personally didn't like the cartridge enough to keep it and thus never got around to reloading for it. I rarely get to shoot far enough to really take advantage of its ballistics and I don't hunt anything that need this much killing. Target shooting beyond 600 yards my 6mm CM suffices and is easier on the shoulder.

taliv said:

Kinda surprised nobody has opinion on working up loads with magnums. Is this rare?

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A buddy of mine and i were playing in the mental mud with some of the 30 magnums, and the 300norma got looked at for a hot minute. Alas his donor action is a standard belted mag, and he doesn't want to do more than spin a barrel on, so that's as far as that went.

Anyway the largest magnums I've worked with are my .375 and a 7mm stw. I generally gather all the bits of data i need to make quickloads as accurate as possible, then drop the SAFE max given by 10-15% and work up (shooting over a Chrono) till I hit pressure, using 1gr increments. At that point I call a grain of two low my working ceiling and hope I got good Chrono data somewhere in there to use as an accuracy starting point.
If everything is input correctly, I've found QLs guess to be pretty bloody close. You REALLY need to watch case capacity tho.
Somewhere in that 10-15% window dosent show consistent velocity, I'll dump that bullet or powder.

I also like to start with the slowest useable powder available, with upto 105% fill ratio. That gives an idea of where you'll be, while also making it harder to blow yourself up.
If you don't mind a suggestion, I'd take a hard look at retumbo. I think your at the bore ratio with that round that it should be right about perfect for it.

taliv said:

one thing i've found a little odd is quickload claims 86.4g of R25 is 99% fill. I just loaded 88, and 89 grains and there's still plenty of room. enough to hear and feel the powder moving when i shake it.

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Have you measured the case volume of you cases against what is in Quickloads? I have run into several cartridges where QL is way off what I measure in the actual cartridges I am using. If your cases you are using have more volume than QL is using that could explain why you getting a lower velocity than QL is predicting.