Originally Posted by edward hogan
Not my intent to give offense.
Good luck with your information gleaning.
Best of luck with any super longrange rifle project you may decide to pursue.
Your remark: "As your 338/300 would be in the transonic range from about 1200 yards onwards, I doubt it would get anywhere near 2000 yards with any sort of accuracy", shows me you have lots of ballistics theory to digest.
I was able to find my Sierra 50th anny manual a moment ago.
Started at 3400 fps the 338 300gr smk has lost 1200 fps at 1000yds, and is going at 2196 fps.
Started at 2700 fps same bullet has lost 1050 fps, and is going 1656 fps.
The same bullet with MV of 1900 fps is still at 1137 fps at 1000yds.
If the physics of the ballistics is relative, then a bullet already going 1656 fps will drop off another 700 fps in the next 1000 yds. (Probably won't have as much a decline, but not having a ballistics software program, I am swagging.)
At any rate, looks to me that any cartridge that starts a 300gr .338 smk at 2700 fps is still super-sonic at a mile easily.
Not to be heretical, but... if a milder load in a shorter barrel provides better intrinsic accuracy with the same bullet it is more likely to do so at distance as well, and it is way more useful in a greater variety of situations.
Edward,,,Not to be rude and we do appreciate your input, but I think you are missing Topshots point......His point is better made with the follwing fact.....The wind drift difference at 1500 yards, in a ten mph wind from 9pm, is two MOA when comparing my 338 edge to the average load in the allen mag. This is with a 300 gn smk.
This equates to 30 inches at the target. From a long range hunters point of view, this is a big deal. Our biggest foe is the wind. Simply put, the Allen Mag (because of its velocity) bucks the wind better. When shooting big game at long distances in varing weather conditions, we need all the breaks we can get.
Hope that helps!!!!