There are some good suggestions here on reamer selection. However, a 7x57 reamer with a standard length throat will have the potential to shoot well provided that the throat is tight and the barrel is good.
I am shooting a 154gr sst in mine that’s seated over .100 thousandths off the lands with a oal of 3.250. It shoots excellent over healthy doses of h4350. I didn’t check exactly how much jump to the lands because of magazine restrictions.
I think a lot of the accuracy problems with this cartridge are to do with the anemic pressures of factory ammo and reloading data.
If you have strong action, why not see if the rifle shoots better with some extra pressure. ( it’s been my experience that most rifles do )
To get the most of this cartridge you have to hand load and be quite an experienced hand loader. The 7mm-08 is a better choice for most.
Last edited by akaSawDoctor; 01/25/21.
