NOE 30 XCB, GC
IMR 4831 46gr
Lars 2500+ Lube\
Nosler brass, CCI LRP
https://www.youtube.com/watch?v=Z-rsMrbxQb0
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NOE 30 XCB, GC
IMR 4831 46gr
Lars 2500+ Lube\
Nosler brass, CCI LRP
https://www.youtube.com/watch?v=Z-rsMrbxQb0
Nice video, thanks. You could call them tracers or smokers:bigsmyl2:
Right?! Maybe some of that was bullet lube spinning of of the boolit.
It's a 22" with a 1:10 twist.
I agree that some were tailing off a bit at the end. 2260fps is just enough to keep them super sonic out to 500 yards.
I imagine a 400 yard target would be a bit easier to hit consistently.
I'm kind of surprised this didn't gain more interest. I don't see many people trying for these kinds of distances.
:popcorn::popcorn::popcorn:lol
I’ll try this with the rcbs 30-180-SP boolit and see if I can get them to group at 500 yds. What alloy were you using?
Well,
I'm interested lol. I'm using the xcb in a 12 twist .308 zastava mauser using imr4350. I haven't tested past 110 yds. yet, so watching your long range results.
I do like that boolit, as it was pretty easy to get some good speed and hunting accuracy with and turned out to be dynamite on whitetails even with the small meplat.
BTW, i used enough 4350 to push it to 2450 fps. chronoed in the above load with 3 coats of BLL lube.
I think linear accuracy is going to hold at distance as well as it shoots at a 100...but i've got to get out and shoot some more to prove it.:smile:
Okay,
Just watched the video and it was very well done...congrats on that!
After your last sight adj., what was the group size on the 3 shots that hit the plate? The two that went to the right of the plate on that string looked pretty well in line with those. Maybe just a bit of wind caught them...doesn't take much at that distance?
Anyway, just watching the smoke trail and impact on the steel, it looked like they were pretty tight. Nice!
Size of the steel?
Impressive, I am still trying to figure out a bullet at 100 yards. But I have only been trying cast about a year.
Your vids are getting better. Good job. I finally got to 200, will have to sight @ 200 to get to 400 next time.
Waco, way to go!!!! Good job and glad more are trying this such a thing. The more you keep doing this the more things will improve. You listen to what Runfiverun tells you too.
Like I said very nice Waco. That figures out to 162.7K rpm at exit, smokin'!
Thanks guys. I’ll try that same load again and maybe up it a bit. I’ll be trying some other powders as well.
Waco
Appears your last 6 or 7 shots (post last scope adjustment) went into, based on the 12"x12" steel, 16 - 20" +/- or 3 - 4 moa. Good job pushing the RPM Threshold up using a properly designed bullet, a slow burning powder and proper alloys. The last shot went up and away to the right and may have been caught by the Threshold. I suggest you might put a large piece of cardboard behind the steel to better track the misses.
Your results with the 30 XCB bullet in a 10” twist .308W with 24” barrel mirror my own results pushing the RPM Threshold up. The NOE 30 XCB bullet, designed by goodsteel with input from runfiverun and myself, was expressly for HV and for pushing the RPM Threshold up. The design attributes suggested by me are all there. I also found AA4350, RL19 and RL22 to perform very well in my test rifle.
I chose two powders to test under the NOE 30 XCB bullet in the .308W rifle with 10” twist; RL19 and RL22. Both of those powders gave the best accuracy out of this rifle with the Lyman 311466 and LBT 30-160-SP cast bullets. Both of those bullets began going over the RPM Threshold at about 2300 fps/165,000 RPM with RL19 and about 2350 fps/169,000 RPM with RL22. Note how both of those bullets and powders have pushed up the RPM Threshold over the incorrectly assumed “limit” of 140,000 RPM. Both of those bullets held under 2 moa accuracy with linear expansion at 200 yards. Thus with that baseline to measure against I loaded test strings of 38, 40, 42, 44 and 46 gr of each powder to test the NOE 30 XCB bullet.
The 44 gr load of RL19 gave 2313 fps, 166,536 RPM at 38,900 psi(M43). The group size was 1.55” for 10 shots. Again giving an excellent ES of 30 fps with the SD at 9 FPS. The Pressure ES was 1,200 psi with an SD of 400 psi which is excellent and demonstrating excellent ignition and uniform burn. Further group testing (10 shots) showed this load held 1.3 - 2 moa consistently.
The 44 gr RL22 load gave 2267 fps, 163,224 RPM at 37,300 psi(M43). The group size was 1.3”. The ES and SD remained low at 57 fps and 19 fps. The 46 gr RL22 load gave 2381 fps, 171,432 RPM at 41,800 psi(M43). Again the ES and SD remained constant at 62 fps and 20 fps. This load might was tested for linear group dispersion to 400 yards. The 7 of the 10 shots at 400 yards went into 6.1”. The other three hit to the right as they got caught by the wind. That opened the group to 8.3” demonstrating very close to linear dispersion and holding 2 moa.
Good job