In a short action, it has the potential for a suitable youth rifle but without care towards optimizing hand loads, can lack the power with many 117 to 120 grain loads to be of any great advantage over the more common .243. It maintains the same case length as the 7x57mm Mauser and .257 Roberts, and the longer case offers a distinct capacity advantage over the .243 Winchester, which should equate to a respectable velocity advantage. Kachok , Dec 9, 2010 #2

Handloading gives you even more options with the .243 vs the .257. The .257 Roberts is a low recoiling, mild powered cartridge.
120gr bullets trump 100gr any day when large deer are involved. The 257 Roberts is about 200fps slower with a 120 gr.


I think the main reason the Bob got creamed by the .243 was the the main .257 load was the 117 RN bullet seated very deep while the .243 had sexy looking spitzers. Beartooth Regular : Join Date: Oct 2011. The .243 lists 55, 58, 70, 75, 80, 85, 90, 95 and 100 gr with many variations of each. bullet then the 243 Win is with a 100gr bullet.

257 Roberts is a better big game getter though. The .257 was designed to run in a bolt gun, and any receiver that was designed for the 7x57mm Mauser will handle the .257 Roberts perfectly. The difference isn't substantial (roughly 100 ft-lbs), but it is a difference all the same if you care about numbers. Whether or not that higher velocity is needed is a personal question, as there are obviously no flies on the .243 Winchester. However, the 257 Roberts carries more energy downrange than the 243 Win.

#11 04-11-2012, 06:13 AM HarryS. The ".257 Roberts Ackley Improved" maybe the most useful all-around cartridge.

I've not shot a Bob before but I can't think of a single reason why it wouldn't work just fine. The .257 Roberts, also known as .257 Bob, is a medium-powered .25 caliber cartridge.It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the .22 and 6mm, and the strong energy but not the strong recoil of larger popular hunting calibers, such as the 7mm family and the popular .30-06.. 243 if varmint is on the menue. On Midway's website, they only list 8 loads available for the 257 Roberts. The Roberts bullet weights are 100, 115, 117 and 120 gr. For the .243, they list 42 loads.

or from that actual list, I'd probably go with the .243 Win or the .257 Roberts. I have been leaning toward the .270 Winchester because there are more bullet weights available for it.

Posts: 3,970 The .25 has a significant edge over the 243 for deer; it takes a 120 grain bullet.

However, the .280 Remington is capable of developing energy nearly equal to the .30-06 Springfield, but with lighter bullets having a better ballistic coefficient.

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