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I'm curious to determine the extent to which ammunition like the Federal Gold Medal Match 175 gr SMK improves performance in our HK 91s, G3s, and clones. What's your average 10 shot group size, with which rifle, with which ammo or load, at what distance, from what position, with what support? Is there an appreciable accuracy improvement over standard M80? How significant?
 

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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.
 

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Buddy tried them in a SR9T. After lot's of work he finally got a three round group consistently down to 3/4" but anything over three rounds would walk out to 1+. He even had the barreled action cryo'd, didn't help a bit.
I tend to agree with tcr above, twist is really too slow for the heavies.
 

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Another vote for nothing over 155gr. in that slightly under 18" barrel with the standard twist.

DG
 

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My experience:

HK 91-Best ammo-Australian (MF4 and AFF) 1" followed by Portuguese (FMN) 1 1/4" ish at 100 yds. Basically, this is a 1 1/2 -2 MOA rifle. Match grade ammo opened it up quite a bit.

HK SR9-FGMM 168gr. SMK- it's consistently an MOA rifle out to 300yds. 175's and ball were not as good.

Both from bench with front and rear sandbags. Shoot a lot with different types, keep records then buy a lot of what works best!!!!!
 

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+1 on that Aussie mF4 accuracy, I have a 100rnd bandolier stashed away. That stuff is amazing.��
 

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tcr39-Australian is by far the best mil surp out there for my HK 91. I'm fortunate enough to have about 5-600 rounds of it. I only use it on "special occasions"! It's SO expensive now----if you can find it.
 
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