What level of accuracy are you looking for or expecting? FMJ bullets, regardless of the core material, aren't going to set the world on fire with their accuracy. The non-uniformity in the heel/boat tail region of the bullet is going to keep them from really shining.
From the AR with open sights, 2" or so @ 100, the Mini, 3" - 4" is probably more realistic. I've fired Hornady .30 caliber 150 gr. FMJBT out of my K-31's and 1903/1903A3's and gotten some really, really good accuracy. My match K-31 with this bullet has grouped 10 shots into less than 1.75" @ 100 with aperture sights with an occassional group down around 1.5"
What kind of shot groups are you getting from AR/Mini14? ARs, especially Mini 14s won't produce the level of accuracy that a bolt .223 rifle will produce.
I think you may be chasing the wrong variable ... your lack of accuracy may be rifle related.
BTW, what is your AR's barrel length and twist rate?
With the Mini, I get HORRIBLE groups with the three factory loads I've tried. Handloads however are much better (all shot with factory aperture sights):
63 gr, Sierra @ 50 yds.,
60 gr. Hornady @ 50 yds. in cluding sighters on left side:
55 gr. Sierra SBT @ 100 yds.:
The AR is far less picky. The target on the left is is a handload with a 55 gr. Sierra SBT, the one on the left Serbian (PPU) 55 gr. FMJ, both shot at 100 yds.:
The barrel is a 16" Dissipator (full sight length) with a 1-in-9" twist.
I don't have much experience with .22 caliber FMJ bullets, but I've shot lots of .30 caliber's. In fact the GP-11 military ammunition loaded in Switzerland for K-31's uses a 174 gr. FMJ bullet and I have to use expensive target bullets to come close to the accurracy of this ammo. Absolute match grade stuff:
Maybe I'll just bite the bullet and try some of the Golden West bullets. I have a Remington 788 I can use as a test bed to see if the bullets are accurate as that particular rifle shoots well just about anything I feed it.
35W
