Dasher and 105/107 and n150?

[handfull]

Anyone had this work? Been tinkering with n150 as alternative to varget. I know some have made it work well with 109s, but I am struggling with 105 hybrids and 107 smks. SD is 2-3x varget for range of loads anywhere from 30gr (2880-ish) to 31gr (2980+), on the order of 15-20SD. Case fill issue? CCI450 with Alpha brass, ATV4 powder trickler, 266 die bushing. Tried in 2 Dashers (both with 700-ish rounds) and both didn't have good SDs, but shot pretty well (<.5MOA). Tried cleaning, scoped to make sure no carbon ring, etc. Thoughts?

 

[giumau1]

105 hybrids and N150 is my preferred combo, however both my barrels are waaaayy slower than yours, as my 26” CRBs 1/7.5 chambered by TS customs with alpha legacy .154 fb reamer are giving me single digit SD over a 30 shots sample and 2820 fps muzzle velocity. I would start checking your scale first, 105 and n150 gave me half moa at any load between 30 and 31.5 tbh.

 

[handfull]

One of my barrels (bartlein 1:7.5) is more like 2780. But if I run varget loaded ammo through the same barrels, they both have good SDs. If I run n150, the SDs are no good for either barrel (one at 2880 (Hart 1:7), one at 2780) - if there was a scale issue, I'd see problems in both loads. Both chambered with alpha reamer .120 FB - could be more jump is needed? Jumping .60 today. I'll double check everything because others have great experience like you. Thanks for feedback!

 

[021411]

105 Hybrids and N150 in Alpha brass is what I use out of my 28” CRB. My match load is 30.4gn jumped 60 thou. It’s doing 2839 fps avg. SD is about 7 fps and ES in the mid 20’s.

 

[handfull]

Appreciate the feedback. Got couple tests gonna run tomorrow to hopefully shed some light.

 

[Hoyt7mm]

I just started playing with it in a Dasher. Only put 40 rounds or so with some basic ladders. Initial testing seems promising, and similar charge weight/speed as varget.

 

[SendCenter]

I used N150, Alpha brass, CCI450's and 105's all last season. 22in barrel, 30.5gr.
22 shot string
2844fps
SD-5
ES-20

 

[handfull]

I am baffled. Tested some today with varying seating depths, with 107s and 105s. CCI450, alpha brass, etc. Results with 7-shot strings were (avg velocity, ES, SD)

107 SMKs with 30.0gr n150
1. 1.726 CBTO - 2926, 24, 8.9
2. 1.756 CBTO - 2918, 28, 9.8
3. 1.785 CBTO - 2899, 34, 11.4
4. 1.816 CBTO - 2890, 54, 19.5
5. 1.847 CBTO - 2867, 29, 9.3

Then a string with 30 gr n150 and 105s
6. 1.780 - 2946, 79, 24.8

Then finally my control group which is the exact same ammo as #6, except 31gr varget.
7. 1.780 - 2938, 22.9, 6.9

Now, this is all alpha brass that is 14x fired, so maybe that is the problem. Maybe this barrel is just wonky, it's definitely way faster than usual even after thorough cleaning and borescope inspection. Will try some virgin as next step.
Randy

 

[021411]

What is your reloading process and what die are you using?
I flame anneal after each firing. I’m using a SAC resizing die with a .266 bushing and .2415 expander mandrel. The inside edge gets chamfered. Brass doesn’t even grow so I don’t trim the length. CCI 450’s as well. AutoTrickler V4.

 

[handfull]

Matchmaster with 266 bushing, annealed each time. Chamfered, no mandrel. Varget loads have consistently been 5-6 SD range for last 5 barrels