Save the 168gr & 175g for your faster 1:10 twist bolt action or barreled precision rifles. The 1:12 twist barrel of hk91/ptr91 rifles is more suited for 147 to 155gr pills. But yes, you may see a slight more accuracy , but it is not worth the major cost difference between the two. I reload 150fmj and 155 amax at .62cents a round and get 1 moa and even under out of my clones with 1:12 twist match barrels. Not to mention, lower felt recoil ; especially less than the recoil of the 175g will give. Do yourself a favor,an save the Match heavy ammo for a precision long gun. Just my exp. See my range report in this section on page 3: "update"DMR jld91k.