Recommendations on .223 loads with 77 Sierra MKS?

[Shynloco]

Jayman_10X
Well since you are entertaining all sorts of suggestions, here's another one for 77 SMK's. AR223, San Tan Tactical, Upper/Lower, JP Precision 22" Super Match 1:8 barrel/parts.....VVN530 - 22.1 gr, CCI SR Primers, Lapua Cases, COL: 2.260.

I'd be interested in what you found works best with 69 Gr Sie MK's and 55 gr Bergers. PM me if you could with that info. My rifle is new (an a duplicate of above) and I'm still developing loads. But the above described AR is what my Gunsmith built and uses in 600 yd competitions. I'm presently working on 100 - 200 yd presently, having just broken in/zeroing my rifle in a few days ago. Thx.

 

[Jayman_10x]

The input is much appreciated! For the time being, I have the 77 MK's loaded up with some CFE 223 (which shot excellent with the 69 MK's) and a few more charges with IMR 8208 XBR. If it doesn't shoot .15 moa or less I will try some H4895 and Varget next I think. Thanks!

 

[Jayman_10x]

Jayman_10X
Well since you are entertaining all sorts of suggestions, here's another one for 77 SMK's. AR223, San Tan Tactical, Upper/Lower, JP Precision 22" Super Match 1:8 barrel/parts.....VVN530 - 22.1 gr, CCI SR Primers, Lapua Cases, COL: 2.260.

I'd be interested in what you found works best with 69 Gr Sie MK's and 55 gr Bergers. PM me if you could with that info. My rifle is new (an a duplicate of above) and I'm still developing loads. But the above described AR is what my Gunsmith built and uses in 600 yd competitions. I'm presently working on 100 - 200 yd presently, having just broken in/zeroing my rifle in a few days ago. Thx.

will do PM on the way

 

[Jayman_10x]

 

[tjtjwdad]

Service rifle configuration with same barrel; LC-96 brass, R 71/2 primer

H4895: 24.0 gr, GRP Size (H) 0.208 x (V) 0.211, SD 10.70, VEL 2662
Varget: 23.5 gr, GRP Size (H) 0.243 x (V) 0.595, SD 21.82, VEL 2637
N135: 22.5 gr, GRP Size (H) 0.244 x (V) 0.258, SD 12.86, VEL 2684
N540: 25.4gr, GRP Size (H) 0.228 x (V) 0.132, SD 14.92, VEL 2784
RL15: 23.9gr, GRP Size (H) 0.528 x (V) 0.403, SD 20.79, VEL 2651

I've tried 8208xbr in a 1-8 twist barrel but with a different bullet weight

HTH

 

[ashiha]

Service rifle configuration with same barrel; LC-96 brass, R 71/2 primer

H4895: 24.0 gr, GRP Size (H) 0.208 x (V) 0.211, SD 10.70, VEL 2662
Varget: 23.5 gr, GRP Size (H) 0.243 x (V) 0.595, SD 21.82, VEL 2637
N135: 22.5 gr, GRP Size (H) 0.244 x (V) 0.258, SD 12.86, VEL 2684
N540: 25.4gr, GRP Size (H) 0.228 x (V) 0.132, SD 14.92, VEL 2784
RL15: 23.9gr, GRP Size (H) 0.528 x (V) 0.403, SD 20.79, VEL 2651

I've tried 8208xbr in a 1-8 twist barrel but with a different bullet weight

HTH

First post here. I have been loading 223 for a while now but had what I thought were issues. You answered so many of my questions with this single post. Thank you.

 

[tjtjwdad]

First post here. I have been loading 223 for a while now but had what I thought were issues. You answered so many of my questions with this single post. Thank you.

Happy to help out