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300 SAUM Imp

You guys seem to be having good luck with the slow powders and CCI 250 in the 30 cals. I might have to swap over and do a full test run with 250s on my 300 NMI.
 
Ok, forming brass now in a 26" barrel 6grove. Things are on par for speeds if converter over to 30" barrel lenght. My question is is there any advantage accuracy wise going from a 30 inch to a 32 inch barrel. As in Burn rate accuracy Etc. I will be primarily using this for f-class. Probably shooting the 215 s if the accuracy is there. Let me know what your thoughts are on barrel length. Thanks in advance
 
Ok, forming brass now in a 26" barrel 6grove. Things are on par for speeds if converter over to 30" barrel lenght. My question is is there any advantage accuracy wise going from a 30 inch to a 32 inch barrel. As in Burn rate accuracy Etc. I will be primarily using this for f-class. Probably shooting the 215 s if the accuracy is there. Let me know what your thoughts are on barrel length. Thanks in advance
This is pretty new chambering with limited data, as far as i have seen. Any info is welcome.....
 
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Anybody try the Berger 208 lrht? Seems like it could do pretty well with this cartridge.
I plan to test some next month. On paper and ballistics calculator the 208s appear to be better in the wind vs the 200.20x which I’m using now. But I’ve heard some guys having odd flyers mid string using the 208s over in FTR. I’ll report back
 
@GlennK

I haven't shot mine in over a year now, but this was where I left off with 215s and rl16 back then. There were jump nodes as well, but my jam node seemed to be in just a bit further than you tried.

View attachment 1203742

Anyway, this was the first barrel the reamer did, and is a 9" twist Krieger. Due to the fact that adg 7 saum brass is dimensionality smaller than 300 saum brass from other makers, Alex's cartridge should really be called "300-7saum adg" lol...but 300 saum imp works
How many grains of Rl16 was this? And were you using a 210m primer? Thanks
 
How many grains of Rl16 was this? And were you using a 210m primer? Thanks
210m yes, and in the ballpark of 61.5 grains if I recall correctly, and it was close to pressure problems at that so work up from 59ish slowly.

Tom
 
Shot primers last week. 210m were the worst and br2 shot the best. Load was developed on 250s. So shot 250s against br2 this morning. Montana was cold and windy this morning. Dialed over 3.5 moa of wind and ran them like a heavy gun group. Shot well. Br2s are red 250s are blue. Br2s won out again. Gun is pretty well set up and will only need fine tuning i hope here on out.
 

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I shot my way to the World Championships in 2013 at Raton using the 300 Saum. You don't need an improved case IMHO because my load was 57.0 H4350 using Berger 210"s. All I did to "tune" the load was switch primers. Some barrels liked BR's and some liked Fed 210's. Magic velocity was 2780 fps from a 30" barrel. i shot out 6-7 barrels and every one liked that load. My reamer was a stock 300 SAUM SAAMI spec with the throat lengthened. I would seat for a .015 to .020 jam and let the barrel wear into a sweet spot where the accuracy lasted until barrel end of life. The early versions of the Berger 215's didn't shoot as stable as the 210's so I stayed with them.
 
@GlennK

These are the 210 vld still? When you say "low node" you're still 2850ish correct?

Tom
Yes that is correct. 210s sorted. They are 2885 ish for speed. There looked to be a node around 2930, but this charge looked happier.. Need to learn how to trim and point
 
I shot my way to the World Championships in 2013 at Raton using the 300 Saum. You don't need an improved case IMHO because my load was 57.0 H4350 using Berger 210"s. All I did to "tune" the load was switch primers. Some barrels liked BR's and some liked Fed 210's. Magic velocity was 2780 fps from a 30" barrel. i shot out 6-7 barrels and every one liked that load. My reamer was a stock 300 SAUM SAAMI spec with the throat lengthened. I would seat for a .015 to .020 jam and let the barrel wear into a sweet spot where the accuracy lasted until barrel end of life. The early versions of the Berger 215's didn't shoot as stable as the 210's so I stayed with them.
Certainly no need to improve the case, unless you want more velocity. The high node with a 210 is around 2930 fps in the improved case in 30".
 

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