Mini-30 Group Accuracy Followup - Shooting Sports Forum


Ruger Mini-14 and Mini-30 Ruger Mini-14 and Mini-30 family of rifles

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Old 07-04-2015, 19:10   #1
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Mini-30 Group Accuracy Followup

I posted a while back some pics of poor groups of my Mini-30. Since then I glass bedded the stock & lowered the torque of the gas block to around 28 instead of 34. Groups are much better now & the glass bed job turned out really good especially since it was my first attempt. I got some epoxy in the half moon holes behind the magazine well & knocked a piece of epoxy out on one side near the top of the stock removing the action after bedding it. I re-worked that small area again & now everything turned out fine. The gun fits in the stock really snug now. Anyway here are some pics of the better groups at 100 yards. As you can see on one of the targets I'm still getting a very low 1st shot on a cold barrel but groups are good after that. Anybody got a solution for the low 1st shot on a cold barrel? Thanks to everyone for your help.
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Old 07-04-2015, 19:23   #2
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Old 07-04-2015, 19:35   #3
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Originally Posted by A/J/S/USNRet View Post
You still haven't found the sweet on your gas block torque. JMHO.
You think that would stop the low 1st shots on a cold barrel?
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Old 07-04-2015, 20:11   #4
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Old 07-04-2015, 20:26   #5
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Originally Posted by A/J/S/USNRet View Post
I believe you can draw it closer to the center of the grouping. The Warmer the barrel gets the farther your stringing. Cold shot to next shot appears excessive. So I don't believe you have picked up the proper Harmonic to set your torque spec to on this particular barrel. JMHO.
At what torque setting would you recommend starting at? Maybe around 22 & work up. The best 3-shot group was under an inch but it was using a load too low for the gun to cycle properly. Taking out the front buffer allowed it to cycle OK but it seemed to get better groups with the front buffer in. Also the best groups were after a clean gun.
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Old 07-04-2015, 20:44   #6
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I've spent many hours at the range with this gun & probably 200 rounds of reloads but I do feel I'm getting closer.
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Old 07-05-2015, 03:55   #7
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grayfox, looks like you are on the right track. Thanks for posting a topic that actually has something to do with Mini's! Lately this forum has just become a bitchfest.
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Old 07-05-2015, 08:32   #8
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if you haven't tried it yet run a dry patch through the bore before firing.
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Old 07-05-2015, 11:55   #9
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Originally Posted by Marlin 45 carbine View Post
if you haven't tried it yet run a dry patch through the bore before firing.
Good idea especially since my best groups come after a good cleaning. I'll be heading back to the range hopefully by next week.
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Old 07-07-2015, 09:00   #10
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Where the heck did you guys find 9/64 long shank hex bits for your torque wrenches to torque down the gas block?!
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Old 07-07-2015, 12:59   #11
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Done
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Old 07-07-2015, 14:47   #12
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there is some member here that was selling them, been awhile since the post.
those are available at a machine shop tool supply - I have a couple - 3 from back when I welded in a fab/machine shop.
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Old 07-07-2015, 15:38   #13
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Bore And Bullet Diameter? ...

This might be a dumb question but I do not remember. Have you slugged your bore to find out exactly what you have? Reason I ask is that Ruger used a couple different barrel bore diameters with the Mini 30.

Which leads to question number 2. What bullet diameter are you using? Weight? What twist? How precise are your handloads. Is the trigger stock or has it been sweetened up? Optic? Optic mount fightness or rigidity?

Have your cast your chamber? Case trim length? Exact head space? Lots of fun and somewhat easy and cheap ways to tighten up your cool Mini 30. Are you using an aftermarket bull .308 barrel? Respectfully. HB.
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Old 07-08-2015, 11:30   #14
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Originally Posted by HB of CJ View Post
This might be a dumb question but I do not remember. Have you slugged your bore to find out exactly what you have? Reason I ask is that Ruger used a couple different barrel bore diameters with the Mini 30.

Which leads to question number 2. What bullet diameter are you using? Weight? What twist? How precise are your handloads. Is the trigger stock or has it been sweetened up? Optic? Optic mount fightness or rigidity?

Have your cast your chamber? Case trim length? Exact head space? Lots of fun and somewhat easy and cheap ways to tighten up your cool Mini 30. Are you using an aftermarket bull .308 barrel? Respectfully. HB.
Barrel is stock & has not been slugged. Chamber has not been cast. Don't have a clue as what the head space measures but the gun is a 582 series & was bought new in July, 2012 so I guess it's .310. As far as I know that's what they all are now. Gun was broke in using mostly Brown Bear & Silver Bear 125 gr. Soft Points. Might have been a bad idea breaking it in with the Russian ammo. Since I started reloading for it the bullets have been Prvi Partizan, Speer Hot Core & Hornady Interlock all .310 diameter & 123 grains. Powder is weighed on a Lee Powder scale that came with the kit. The powders I'm using are H4198 & H335. All cases are sized & trimmed & then primed with CCI 200 large rifle primers. All bullets are crimped using the Lee Factory Crimping Die. COL is 2.2 or very close measured with digital calipers. All rounds are fired at 100-103 yards off of Cadwell shooting bags filled with sand. The trigger was done by Gun Doc. I did have a Redfield Revolution 2-7X33 mounted on it but recently changed to a Leupold VX2 3-9X40. Everything is tight. Just recently glass bedded the stock going by Gun Doc's Video. Hope I've answered your questions & feel free to ask more. I appreciate everyone who's tried to help me get my Mini-30 to shoot it's best. I'll give you another range report later.
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Old 07-08-2015, 11:32   #15
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Originally Posted by A/J/S/USNRet View Post
grayfox2013, with any luck I'll take out another Forum Member on Thursday and let him shoot the Mini-30. Don't have a Bipod on it so it will be from a Hasty, but I think that should give you a better Idea of what is Normally attainable. I'll have him start cold bore and weather permitting I'll see if we can post a few pictures. He'll be using Standard Silver Bear 123's, the only modification to the Tactical Mini-30 is Torquing. Mid Level Ruger rings hold he Weaver 2-10 tactical scope. Luck to you until then.
That would be great. Thanks
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Old 07-08-2015, 14:44   #16
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I'm almost certain the bore of the 182 series is .308.
seems ruger went to .310 beginning with the 189 series.
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Old 07-08-2015, 14:51   #17
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Originally Posted by Marlin 45 carbine View Post
I'm almost certain the bore of the 182 series is .308.
seems ruger went to .310 beginning with the 189 series.
It's not 182 but 582. I've corrected it in my post. Sorry about the typo error. Thanks for bringing it to my attention.
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Old 07-08-2015, 16:41   #18
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ok, then likely .310. my 189 series is .310.
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Old 07-09-2015, 15:52   #19
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Name:	target.jpg
Views:	272
Size:	11.5 KB
ID:	27826Hope this is a clear picture of the target.
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Old 07-09-2015, 16:21   #20
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Looks similar to what I've experienced but my 2nd shot would usually be higher up with the rest of the group.
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Old 07-09-2015, 16:57   #21
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there is nothing to scale the target what group size overall?
I have had low flyers what I do is run a couple rounds thru hand cycle rapidly dropping the bolt then chamber a round drop the mag and top off - this is at the range, off the bench when I'm trying for tight groups.
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Old 07-09-2015, 18:59   #22
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Originally Posted by A/J/S/USNRet View Post
Attachment 27826Hope this is a clear picture of the target.
You are looking at One inch squares. From cold bore to the highest flyer # 5 is a little less than two and a half inches. Two of us shot 1 inch targets all day after I corrected for warm bore center. Ran 138 rounds in 3 shot groups without either shooter going outside a 1 inch by One Box. Now I'll state that the rifle is capable of MOA at 100 yards with shooters that are capable of that level of accuracy. By the way, Chopper feels a whole lot better about Mini-30's than he did when we left the 200 Yards Range, might even be able to convince Him to try the 300 Yard Range at a later date.
Sorry it took so long to get back to Ya'll, but the Cigars, Bourbon, and Hoppe's on the Back Porch took Priority.
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Old 07-09-2015, 19:08   #23
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Old 07-09-2015, 20:04   #24
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Originally Posted by A/J/S/USNRet View Post
If I'm not mistaken you pictured 6 inch (or where they 8 Inch?) cadwell targets. None of the 5 shots in this cold bore rapid fire string went outside of a 2 1/2 by 2 inch area. How far did your cold bore shot end up from the Zero for the rest of the day's shooting?

I believe you can get the cold bore to warm barrel group center at less than 2 MOA when you hit the right Harmonic to Torque ratio. JMHO.
I added some more info on this post. The black circles are 8 inches in diameter. On the bottom left target the first low shot was from a cold barrel. It's about 3.25 inches from the closest one next to the center. On all but one of the other targets the barrel was not cold on the first shot. On the bottom right (tightest group) I had fired about 3 shots at 25 yards to get it sighted in close enough to be on paper at 100. Then I moved out to 100 yards & shot the group. This group was 13/16" from center to center of the farthest bullet holes. This was with a squeaky clean gun. The barrel was not cold but maybe just slightly warm. Most of the other targets were probably with a warm barrel. Some of the targets were shot on a different day also. The dates are on the targets. The first 2 targets on the top were shot with no front buffer, just a rear buffer. The others were with a rear buffer only. I put the front buffer back in to try next trip. I'm going back to the range Saturday morning so maybe I can get some more pics up in a few days. I will take my torque driver with me.
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Last edited by grayfox2013; 07-09-2015 at 20:23. Reason: Adding more information
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Old 07-09-2015, 20:18   #25
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