The "flat shooting myth"

Once into the bore the geometric shape of the chamber it came from has no influence on the bullet

Look at the ballistic table below. There is absolutely no reason for those continual, useless, energy wasting arguments about "this" versus "that" type chamber in hunting rifles. From the .264 Win Mag to the .338 Win Mag they are all within .5 MOA with one another with popular bullet weights. Trajectory differences are way less than any hunter can shoot, or even what the accuracy potential of 90% of hunting rifles is.  Looking for your first hunting rifle?  Just buy any 6.5mm, 7mm, or .30" calibre that speaks to you when you shoulder it. With appropriate bullets it will make a perfect hole in exactly the same spot as any other one at the same distance.

 

There is no practical difference between the 7mm Rem Mag and the .303 Brit or 30-06 or whatever at ethical shooting ranges. (Even for those ranges some unethical shooters do target practice on live animals at there still will at most be 1 MOA difference). All of these will kill your big game in exactly the same perfect way too if you put a bullet of sufficient mass and of sturdy construction into the heart.

 

In the table all rifles are sighted for zero at 200 yards. It includes calibres from the "flat shooting" .264 Winchester Magnum to the old .303 Brit as well as the .338 Win Mag - each with a comparable bullet weight for general application. In some instances more that one bullet weight is tabled. Bullets with close to similar design were used for the data research.

All zeroed at 200 yards:

.308 Win
140 gr
3,000 ft/sec
- 2.7 inch
.308 Win
150 gr
2,900 ft/sec
- 3.0 inch
150 gr
7mm Rem Mag
3,000 ft/sec
- 2.5 inch
2,900 ft/sec
7x64 Brenneke
150 gr
- 2.6 inch
2,700 ft/sec
7x57
150 gr
- 3.2 inch
.270 Win
140 gr
3,000 ft/sec
.270 Win
150 gr
2,900 ft/sec
.264 Win Mag
140 gr
3,000 ft/sec
- 2.6 inch
- 2.4 inch
- 2.7 inch
6.5x57
140 gr
2,750 ft/sec
6.5x55
140 gr
2,750 ft/sec
.260 Rem
140 gr
2,700 ft/sec
- 3.3 inch
- 3.3 inch
- 3.3 inch
6.5 Creedmoor
30-06 Sprg
140 gr
2,700 ft/sec
3,000 ft/sec
- 3.3 inch
- 2.6 inch
30-06 Sprg
165 gr
2,900 ft/sec
- 2.8 inch
.303 Brit
150 gr
2,750 ft/sec
- 3.4 inch
150 gr
.338 Win Mag
250 gr
2,700 ft/sec
- 3.2 inch
.35 Whelen
250 gr
2,600 ft/sec
- 3.7 inch

7x64 l 8x57 l 6.5x55 l .308W

Well, how about that - they simply are all the same!

 

As a comparison look at the .308 Win with its "rainbow trajectory":  It is the equal of the .270 Win with same weight bullets and only one half inch lower at 250 yards than the 7mm Rem Mag and the famous flat shooting  .264 Win Mag.

The 120 year old 7x57 and .303 Brit are less than one half inch lower at 250 yards than the .270 Winchester.  No wonder the 7x57 was Jack O'Connor's favourite hunting cartridge.

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