View Full Version : 70 grain Nosler RDF IMR 8208 XBR
Anyone tried this combination as yet? If so any results you'd care to share. I'm in the process of loading up a ladder and as per Nosler's suggestions going with 69 grain 5.56 data. Although they do not offer XBR as a powder choice I do have quite a bit accumulated from Sierra's 69 MK and Tmk's.
I have tried it and the results were ok (10 shot groups around 1", not as good as 77 SMKs). Unfortunately, I'm deployed right now and don't have all the data.
Anyone tried this combination as yet? If so any results you'd care to share. I'm in the process of loading up a ladder and as per Nosler's suggestions going with 69 grain 5.56 data. Although they do not offer XBR as a powder choice I do have quite a bit accumulated from Sierra's 69 MK and Tmk's.
What is your charge for 69gr TMKs and SMKs with XBR? Curious for my own data.
What is your charge for 69gr TMKs and SMKs with XBR? Curious for my own data.
This load is safe in my rifle and was worked up according to established published proceedures... Due to variations in equipment and or components I strongly suggest anyone to do the same.
Note the rifle is a Colt HBar Elite 24" 1 in 9 with a 5.56 chamber.
69 Sierra tipped matchking in Lake City '14 cases with Wolf small rifle magnum primers bullet seated to maximum magazine length. Charges weighed on Gempro 250 scale; IMR 8208 XBR @ 23.8 grains, velocity 2960 ft/secs SD 11 from 10 shots recorded by a LabRadar unit.
https://i.imgur.com/ywIhr3a.jpg
Conditions were horrible, winds to 20 MPH, cold by desert standards, and basically I rushed to get chronograph data before the rain squalls hit... Distance to target 100 yards.
No swipe or over pressure seen at 24 grains. I am planning on reshooting the 23.6 charge and also going to see if there is a higher node, carefully :-)
When running a comparison between this and the Sierra 69 grain Tipped MK in JBM given the same velocities this Nosler 70 grain RDF is 3.8 MOA flatter to 1K, 2 MOA less wind of course as well. Hopefully neither the computer nor Nosler is fibbing. Additionally the Nosler at 3,000 ft/sec would be supersonic to 1200 yards vs 1000 for the Sierra in my AO.
This load is safe in my rifle and was worked up according to established published proceedures... Due to variations in equipment and or components I strongly suggest anyone to do the same.
Note the rifle is a Colt HBar Elite 24" 1 in 9 with a 5.56 chamber.
69 Sierra tipped matchking in Lake City '14 cases with Wolf small rifle magnum primers bullet seated to maximum magazine length. Charges weighed on Gempro 250 scale; IMR 8208 XBR @ 23.8 grains, velocity 2960 ft/secs SD 11 from 10 shots recorded by a LabRadar unit.
Thank you for this. I have been running 23.7gr XBR/mixed brass/Tula SR primers, and getting MOA or slightly under, with myself being the limiting factor. I'm happy with it. I was wondering how other people were running similar loads.
Thank you for this. I have been running 23.7gr XBR/mixed brass/Tula SR primers, and getting MOA or slightly under, with myself being the limiting factor. I'm happy with it. I was wondering how other people were running similar loads.
You are more than welcome Sir.
23.8 sounds pretty good, depending on the lot. That was our original 77 gr smokers load. Lot change had primers popping though. For a 70 grain bullet, I'd expect a nice round.
Ned Christiansen
02-04-19, 17:23
Their factory loading of it was very, very accurate for me.
23.8 sounds pretty good, depending on the lot. That was our original 77 gr smokers load. Lot change had primers popping though. For a 70 grain bullet, I'd expect a nice round.
Mark I have to agree the lot to lot variation has to be watched closely with this powder. That said it still performs well once adjustments are made.
My 77 grain load is 23.2 FWIW
Ned That is good to hear as I have found some of their more recent efforts to be lacking.
This box of Noslers is showing just a little less velocity per grain, so I have loaded a ladder that is going to be a bit stiffer than the first effort. There was not a hint of swipe nor particularly flattened primers in this first effort, just with Mother Nature would accommodate my worthy efforts.
I found XBR 8208 to be the one of the most accurate powders i have ever seen with heavy for caliber bullets. Unfortunately the "power band" came in way low on the velocity/pressure region of the load development. The higher i went above 23 grains, the bigger the groups. That was just one rifle and one test. Obviously other people have great luck with it at max pressure with various barrel profiles.
The name of the game is knowing when to hold and when to fold though. (powder or bullet) Sometimes we all temporarily forget that.
Next time you go out into the world on a calm day, you should do the next loadings all at 300 yards. The truth always starts to be told at that distance and beyond.
Of course you know that. Just a friendly reminder to other readers who read this down the road.
I have a Colt 6724 also. It is the most accurate rifle i will likely ever own. I only shoot 55gr Nosler BT's with W748. Stupid accuracy, with so much satisfaction.
I found XBR 8208 to be the one of the most accurate powders i have ever seen with heavy for caliber bullets. Unfortunately the "power band" came in way low on the velocity/pressure region of the load development. The higher i went above 23 grains, the bigger the groups. That was just one rifle and one test. Obviously other people have great luck with it at max pressure with various barrel profiles.
The name of the game is knowing when to hold and when to fold though. (powder or bullet) Sometimes we all temporarily forget that.
Next time you go out into the world on a calm day, you should do the next loadings all at 300 yards. The truth always starts to be told at that distance and beyond.
Of course you know that. Just a friendly reminder to other readers who read this down the road.
I have a Colt 6724 also. It is the most accurate rifle i will likely ever own. I only shoot 55gr Nosler BT's with W748. Stupid accuracy, with so much satisfaction.
I was right around that 23gr point when I got the best accuracy also.
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