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since you are asking about benchrest shooting, then I presume that single loading is the routine and you are not limited to mag length ammo. With the 1:8 twist barrel, you may also consider the SMK80 or B 80.5 or B 80 VLD bullets. These bullets will be longer than mag length when properly loaded but that is not a problem with single load and you would get better BC than the 69/77's.I have a 1 in 8 twist
18" barrel ar15 with 77smk AA2520-25.0gr seated to 2.255 2725fps. Temp is in the 50s today.
Mk262 is ~2850 out of my 20" service rifle
7.7What barrel twist?
Fuj,I'm going to throw this out there, but on the basis of my one
Rock River EOP. It has a 20" Wilson 8 twist, full bull with Wylde
chamber. It will shoot under 1/2 MOA groups at 500 yards at
Spartansburg with the 77gr Sierras. The 69gr Sierras were over
0ne MOA. However and a fluke with this 8 twist barrel, the 69's
shot 1/3 MOA groups at 100 yards if I backed them down to
2650 fps when I noted it in my initial work ups. I used this load
in short range steel match's and took a few wins.
1:8What barrel twist?
I have a 1 in 8 twist
Sierra 69 mk, 4895 powder, cci 400 primer, Lapua brass or Norma alternative.which of these bullets do you recommend for 300 yds? what powder and seating depth?
this is for benchrest matches at 300 yds with a Tikka varmint rifle in 223 24 inch barrel