A few days ago I mounted my new S&B 5-25x56 on my TRG-42 in 338LM. Friday afternoon I sighted in the new scope at my backyard 100-yard range. One round after boresight, adjusted, then one round for minor adjustment, then three rounds for confirmation.
Today, I set up a target at 300-meters and dialed in 1-mil of elevation dope (JBM Ballistics called for 1.1-mils). Had a tail wind at nearly 6-O'clock averaging 9 to 10-mph. So I figured I didn't need the extra 0.1-mil dialed in as the wind would carry the bullet. I then shot a 5-round string. Other than the wind, I had some heat mirage and couldn't get a pefectly crisp picture while adjusting the parallax.
The 5-round group had a vertical spread of about 3-inched, and a horizontal spread of about 1.5-inches. The group was centered almost perfect on the vertical centerline, but the weired thing it was a little over 3.5-inches low, or 1-mil low of the horizontal centerline.
The only thing I can figure is that the wind was pushing the rounds down because my shooting position was on a rise or elevated position, the the 300-meters to the target was a big depression, with the target on a hillside at roughly the same elevation that I was shooting from.
We then engaged steel at 930-yards, or 850-meters and the wind had moved to a crosswind at about a 45-deg angle from the rear. With the remaining 9-rounds I only hit that 18x20-inch plate once, most of the rounds went just over the top of the steel because of the wind kept carrying the bullets.
Anyone else expeience the wind pushing their bullets down, or was I experiencing the effects of mirage?
Today, I set up a target at 300-meters and dialed in 1-mil of elevation dope (JBM Ballistics called for 1.1-mils). Had a tail wind at nearly 6-O'clock averaging 9 to 10-mph. So I figured I didn't need the extra 0.1-mil dialed in as the wind would carry the bullet. I then shot a 5-round string. Other than the wind, I had some heat mirage and couldn't get a pefectly crisp picture while adjusting the parallax.
The 5-round group had a vertical spread of about 3-inched, and a horizontal spread of about 1.5-inches. The group was centered almost perfect on the vertical centerline, but the weired thing it was a little over 3.5-inches low, or 1-mil low of the horizontal centerline.
The only thing I can figure is that the wind was pushing the rounds down because my shooting position was on a rise or elevated position, the the 300-meters to the target was a big depression, with the target on a hillside at roughly the same elevation that I was shooting from.
We then engaged steel at 930-yards, or 850-meters and the wind had moved to a crosswind at about a 45-deg angle from the rear. With the remaining 9-rounds I only hit that 18x20-inch plate once, most of the rounds went just over the top of the steel because of the wind kept carrying the bullets.
Anyone else expeience the wind pushing their bullets down, or was I experiencing the effects of mirage?
