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I'm looking at the 5819 model. What kind of accuracy should I expect with say 5.56 55gr @ 100yds?Assuming using decent ammo
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Assuming decent quality ammo suitable for your modern, tapered barrel's 1-9" Rate of Twist, probably 2 MOA @ 100 YDS.
This also assumes a mechanically decent rifle.
https://sunflowerammo.blogspot.com/2012/11/ruger-mini-1430-barrel-twist-rates.htmlMost modern, tapered-barel Mini-14s, barring rare mfg defects are about 2 MOA @ 100 yds with suitable ammo.
This can be improved-upon, but getting very close to 1 MOA gets expensive.
Tolerable expense, and fairly easy user-tinkering getting it to 1.5 MOA.
First thing to do before doing
anything is to verify your Mini is flawless in function. Make NO modifications, as Ruger hates such. In the rare instance of a problem, send it back to Ruger (Unmodified) with complaints clearly stated. You paid for warranty; use it if needed. Usually, this approach is
seldom needed.
Generally, making sure the rifled action fits
very snugly into the stock is first thing to address. Syn stocks usually better than wooden stocks, but both can benefit from some "massaging" the wooden ones usually much more so.
Suggest replacing OEM Ruger flash suppressor with equivalent GI A2-style F/S, which has a closed bottom, and hence a little less muzzle rise during rapid fire, quicker target re-acquisition, and less dust signature while prone. You'll need a couple of crush washers for this, one as a backup. Cheap, and effective.
Aside from stock fit, and replacing the Flash Suppressor with a better one, most folks change the gas orifaces/ports within the gas block to a much smaller size, and use this opportunity to re-torque the gas block screws evenly--often a source of OEM assembly/accuracy problems. Sandog on
https://www.perfectunion.com/forums/ruger-mini-14-and-mini-30.86/ claims that 25 inch/pounds seems to yield best results.
Reason for gas port change is that Mini-14 comes from factory with HUGE diameter gas port, same as used in Mini-30. Way too much gas for the 5.56 ctg. Changed out my gas port/oriface for a smaller one and accuracy improved on my early pencil barrel rifle. Can't say if your accuracy will improve as much as my very different Mini did, BUT, your Mini won't be
battered by over-gassing. I had to adjust sight "zero" after replacing OEM gas port/oriface; the new, smaller gas port/oriface allowed more gas behind the bullet, thus giving a little increased range, and so requiring initial sight zero change. More Range=Better.
Note that I've said NOTHING about sights/optics. The Mini-14 is a close-to-intermediate range rifle. OEM iron sights can certainly be improved upon, but suggest addressing the
fundamentals before considering such. First things first. If you
require optics to shoot accurately, then definitely consider consulting the folks at above-linked PerfectUnion site.
Your late model Mini is probably a 2 MOA rifle, as-is, with decent ammo, assuming correct components/assembly. Possible to make it a little better for scant expense, if you're willing to tinker a little. If interested, go here:
https://www.perfectunion.com/forums/ruger-mini-14-and-mini-30.86/