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I've been using Staball 6.5 for awhile now. Through a 22 inch barrel I'm getting 2850 fps with 43.7 grains and a 123 gr. ElDM.

Just use tiny lead bird shot as the medium.

I've been messing around with the Berger 215 Hybrid Target and H1000 but in the improved version of the 300 NM. A ten shot group averaged 3135 fps ES 9.5 and SD 4.1. This was down a 30 inch barrel and a charge of 87.5.

H1000 works great with the 215 gr. bullets but it's a bit to fast for the heavies. I can't find N570 so I've been using H50bmg and Staball HD(same burn rate as Retumbo).

But what is your air density? I'm at sea level and during the summer months my 1/9 twist is fine with an air density of +150 ft but when the temperature drops below 20 F I start to see air density readings of -2000 ft and when it gets down to below 0 or below I see air density readings of -6000...

My last barrel was a 1/9 twist and where I live it wasn't enough to stabilize even a 230 gr during the winter months. Don't overlook H50bmg it gives the best case fill and was the easiest to tune. Also Staball HD showed promise but I only had a pound to play with. It has the same burn rate as...

What twist is your barrel? What is the intended purpose, hunting or ELR? I would go with N570 if you can find it.

I just tested some h1000 and got 3115 fps with a SD of 3.7 and a ES 9.5.

I've used Weaponized math for two years now and it's always been spot on. There's days when the environmentals have changed so much I can't get on steel and I have to go back to 300 and start again. I'm at sea level in Alaska and on a good summer day I might get a +150 ft AD but by winter and at...

I did and it's pretty slow. I had good results with H50bmg

To fire form I just dumped in 25 grains of Greendot in the case and sealed it by sticking the neck into a bar of soap. Worked like a charm and smelled oh so fresh. LOL

My JP had trouble with Lapua brass due to its neck thicknes was causing over pressure. After you fire a few rounds see if you can slide a bullet back into the cartridge. I turned the necks and the problem went away. As to load development, I do a work up for the charge weight to find the...

There is a thread on accurateshooter.com by Alex Wheeler

It took me several thousand rounds to learn how to shoot my JP with any consistency. There is a lot of good information in this thread to get you there. Have you tried any 123 gr. bullets? That is what Jp recommends...

Hey thanks for the information

You won't pay for your trip if that's what your thinking. You might just end up staying longer than you think to sell it.

Thanks for the link but nobody will ship to Alaska.

I just did load development with H50bmg I’m my 300 norma Improved. I started at 88 grains and got 2750 FPS went all the way to 96 grains at 3150 fps and still no pressure signs but it’s going to take a drop tube to get any more in the case. This is by far the best powder I’ve tried out of...

Wheeler just did a chamber for me a couple of months ago. If you talk to him more in length he would rather not do complete rifles.

I tried some Staball HD today and it shot pretty good. My gun is a 300 Norma Improved so keep that in mind. I couldn’t find any data but since it’s burn rate is close to Retumbo that’s where I started. 30 in Bartlein 8 twist 5r 230 gr Atip CCI 250 Peterson brass 83 gr. No data 84 gr. 2859 fps...