Spent some time working up a load in 243 win with a 110smk using an AIAT with a 26" 8 twist barrel. I've got the 110's going about 3015 fps with 47 grains of H1000, zero pressure signs. They could be run way harder with a different powder but I figured I'd get pretty good barrel life with it. Anyways...
- At 100 yards it shoots very well, consistently half MOA.
- I stretched it out a bit a few weeks ago and had great groups at 400 yards, several 3 shot groups under 2". Same day went from 400 to 1k and things got interesting, seemed very inaccurate but it was windy and I only had about 5 rounds to shoot at 1k so I figured I just needed to shoot more to figure the round/wind out.
- Today, I took 50 rounds out to really get it dialed in at longer ranges. Conditions were great, a little overcast, and almost no wind (which is rare here). Again at 400 things were great. At 600 groups on steel opened way up. 800 was wildly unpredictable. And 1k just pissed me off, 1 round on target, next 2 feet high and right, next a foot low.
What I assume, and have learned from others with similar experiences with good close range accuracy but poor long range accuracy is that the bullet probably isn't spinning fast enough? If anyone has any ideas about what else may be going on, I'm all ears. For what it's worth, same day, same gun, 308 barrel, 8/10 hits on 12" plate at 1k.
My belief is that the 110 SMK doesn't work in an 8 twist barrel. Hopefully this saves someone some time in the future. Now I get to start over with a 105.
- At 100 yards it shoots very well, consistently half MOA.
- I stretched it out a bit a few weeks ago and had great groups at 400 yards, several 3 shot groups under 2". Same day went from 400 to 1k and things got interesting, seemed very inaccurate but it was windy and I only had about 5 rounds to shoot at 1k so I figured I just needed to shoot more to figure the round/wind out.
- Today, I took 50 rounds out to really get it dialed in at longer ranges. Conditions were great, a little overcast, and almost no wind (which is rare here). Again at 400 things were great. At 600 groups on steel opened way up. 800 was wildly unpredictable. And 1k just pissed me off, 1 round on target, next 2 feet high and right, next a foot low.
What I assume, and have learned from others with similar experiences with good close range accuracy but poor long range accuracy is that the bullet probably isn't spinning fast enough? If anyone has any ideas about what else may be going on, I'm all ears. For what it's worth, same day, same gun, 308 barrel, 8/10 hits on 12" plate at 1k.
My belief is that the 110 SMK doesn't work in an 8 twist barrel. Hopefully this saves someone some time in the future. Now I get to start over with a 105.
