The second most accurate load I had for the 350 Rem was with 250 grain SPEER bullets (most accurate was with Interlocks):
350 RM, Remington 600, 250 grain SPEER, 9 1/2M, 56 grains IMR4320, 0.66 MOA
In my 256 Win Mag the most accurate load was factory Winchester, alas I don't have any anymore. But the following was one of the two most accurate hand loads. It is devastating on cotton tails.
256 Win, Winchester 92, 75 SPEER, 16 grains IMR4227 0.700, 1.13 MOA (group sizes averaged .7" at 59 yards)
My cousin likes the 170 Grain SPEER bullets in his 8x57 - he says it is the most accurate load he's tried. I believe he said that was with IMR4064.
The Speer 170 SMP, is the only bullet I shoot in my 8 mm Mausers....with speeds as low at 1800 fps and as fast as 3100 fps...
it works at both speeds, and every thing in between... and no shortage of accuracy...
I've always looked at the 8 x 57, its like its a big copy of the 223 Rem.. So I use powders I'd load in my 223s... SR 4759, IMR 4198 and RL 7 being the main 3.. but also Blue Dot, Unique and Alliant Steel....
none have EVER failed to drop what I have shot them with... usually blacktail deer...
even testing them into wood as a test media, their penetration and apparent damage to the media has been impressive...
