DrMike
Ballistician
- Nov 8, 2006
- 37,505
- 6,511
Another day at the range. The temperature was a pleasant 23C this morning, rising to only 24C by mid-afternoon. The wind was gusting to 8 km/hr and averaging 4.4 km/hr throughout the entire shoot, however. The wind was blowing from 150 degrees primarily, though there was a fair amount of swirling between the berms. This meant doping the wind and shooting between the gusts (not my strong suit).
I was finishing off load development for a 270 Weatherby shooting 130 grain TSX. Interestingly, as velocity rose, accuracy degraded across the board. This particular rifle has been consistent in performing in this manner. However, after speaking with the owner, we settled on a load that gives acceptable accuracy. Velocity is ~3100 fps, so it will definitely tag game. I apologize for the poor picture quality.
I had the 338 RUM to the range once again. I was testing one new set of loads and verifying another.
This is the rifle.
Here are a couple of the loads built with VN570 and 225 grain TSX bullets. As you can see, the velocity has plateaued. Whilst there were no overt pressure signs, it is apparent that I am beginning to work at excessive pressure at this point. Accuracy was degraded after this, and velocity did not increase significant from this point onward. The load was intriguing, but led to a dead end.
Here is the load I verified, built with Magnum and 225 grain TSX.
I also worked with a 7RM that was delivered to me late last week. It is a handsome rifle, even though someone stuck the bolt on the wrong side. I had to shoot the rifle backwards, but it worked out okay. The loads were built around 140 grain AccuBonds, and they gave me the accuracy I needed to see. Were it my rifle, I'd have to sell it to Gerry or to Dan. However, it isn't mine, so I have to deliver. I'd also lean toward the 160 AB, but that is not what was ordered.
Out of the gate, it gave me good accuracy at ~3100 fps across three separate loads. Here is a sample of what it was doing for me.
In all, a profitable day at the range. Each of the rifles produced a load that will satisfy the owner. Now to load up a series of loads for burning turrets on each of these rifles.
I was finishing off load development for a 270 Weatherby shooting 130 grain TSX. Interestingly, as velocity rose, accuracy degraded across the board. This particular rifle has been consistent in performing in this manner. However, after speaking with the owner, we settled on a load that gives acceptable accuracy. Velocity is ~3100 fps, so it will definitely tag game. I apologize for the poor picture quality.
I had the 338 RUM to the range once again. I was testing one new set of loads and verifying another.
This is the rifle.
Here are a couple of the loads built with VN570 and 225 grain TSX bullets. As you can see, the velocity has plateaued. Whilst there were no overt pressure signs, it is apparent that I am beginning to work at excessive pressure at this point. Accuracy was degraded after this, and velocity did not increase significant from this point onward. The load was intriguing, but led to a dead end.
Here is the load I verified, built with Magnum and 225 grain TSX.
I also worked with a 7RM that was delivered to me late last week. It is a handsome rifle, even though someone stuck the bolt on the wrong side. I had to shoot the rifle backwards, but it worked out okay. The loads were built around 140 grain AccuBonds, and they gave me the accuracy I needed to see. Were it my rifle, I'd have to sell it to Gerry or to Dan. However, it isn't mine, so I have to deliver. I'd also lean toward the 160 AB, but that is not what was ordered.
Out of the gate, it gave me good accuracy at ~3100 fps across three separate loads. Here is a sample of what it was doing for me.
In all, a profitable day at the range. Each of the rifles produced a load that will satisfy the owner. Now to load up a series of loads for burning turrets on each of these rifles.
