rnbra-shooter
CGN Ultra frequent flyer
- Location
- New Brunswick
Thats good news. Ive read that its more of an oddball twist rate than 1:11 or 1:12 to it prefers heavier bullets, but then again, others state that its very versatile, stabilizing 150s-220's. I know its all grapevine, but it gives me things to chat about.
The distance im taking is 900-1000 meters
I understand that virtually all Savage .30 cal barrels are 1-10" twist.
Typical "TR" rifles use 1-13" twist barrels, and routinely shoot 155s to 1000 yards. A quicker twist (such as 1-10") is not needed, though they usually work just fine. Bullets don't get less stable as they go downrange, they get more stable; if they can hit paper at 100 yards, they will be stable at 1000 yards and beyond. (And you do not need a quicker twist barrel to shoot 1000 yards than you do to shoot 600 yards)
If you're shooting with the ORA, the longest range you'll probably get to shoot at is 1000 yards (Mon Range, CFB Borden) or 900m (approx 990 yards) at Connaught Ranges, Ottawa. Thousand meter ranges are quite unusual.
As I understand, your rifle has a 24" barrel. This might cost you 125-150fps vs. what it achievable in a 30" target rifle barrel. Given that nice hot loads can reasonably get a 155 going about 3000fps in a 30" bbl, you ought to be able to get 2850fps. At this muzzle velocity, a Lapua 155 or Berger 155.5 will certainly be fine at 1000 yards (1200fps). An old Sierra #2155 will be marginally subsonic (Mach 0.972), but will probably work OK. A new Sierra #2156 will be going 1163fps at 1000 yards (Mach 1.042).
In the unlikely event that you don't get good results with 155s, you could shoot Sierra 175s. At 2650fps they be going subsonic right around 1000y (M=0.998), which ought to be OK. The Sierra 175s will give you essentially identical performance (and wind drift) as the higher performance 155s (Sierra #2156, Berger 155.5, Lapua 155)