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Barrel Conditioning


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Old 06-13-2012, 12:52 AM   #21
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Default Twist 1:9

Excellent point, many people give up on a rifle w/o finding the right combination. First question Ruger tech asked me was what are you shooting. Older mil spec was 55 gr approx 3,200 and he said 55-62 was in the sweet spot but of course, individual results may vary.

For long range, the heavier 77 & up gr rds can reach out to 600 yds w confidence but it needs the 1:7 which very few production rifles have.

I've got some TULA steel case fodder but that isn't known as Tgt friendly. Need to to get a variety of ammo but I'm on a tight budget. I'll start w a good cleaning and Flitz. Will try to smooth barrel out by firing it.
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Old 06-13-2012, 06:16 AM   #22
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Originally Posted by TLuker View Post
There's a lot that goes into dialing in a gun. Finding the bullet it likes is part of it. A lot of the mil-surplus is 62gr and it was made for a barrel with a 1:7 rate of twist. The mini is 1:9. It will shoot the mil-surplus stuff but accuracy at distance can suffer. Mine doen't like 62 gr bullets. I just don't think there is enough spin in the 1:9 barrel of the mini to stabilize a 62 gr bullet. On the flip size a lot of the lighter bullets made for varmints can fly apart because they were built for the 1:12 rate of twist in most varmint rifles. Try different bullets until you find one it likes and try those bullets at longer distances.
M855/SS109 is known to have poor accuracy. The mil-spec for M855 calls for 95% to hit an 8x8 inch square at 200yds through a test barrel, that's worse than 4MOA. Current production I've heard is worse, since the DOD been granting exemptions on meeting specs, in order to meet demand. The problem with M855 is the steel perpetrator is almost never centered perfectly, resulting in an unbalanced bullet.

On twist, a 1 in 9 should handle anything from 40-73gr, some might handle heavier 75-77gr, but not likely. Longer barrels can handle heavier bullets than short barrels, since the increased muzzle velocity means the bullet is spinning faster.
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Old 06-13-2012, 10:07 PM   #23
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Quote:
Originally Posted by Neurotic_Hapi_Snak View Post
M855/SS109 is known to have poor accuracy. The mil-spec for M855 calls for 95% to hit an 8x8 inch square at 200yds through a test barrel, that's worse than 4MOA. Current production I've heard is worse, since the DOD been granting exemptions on meeting specs, in order to meet demand. The problem with M855 is the steel perpetrator is almost never centered perfectly, resulting in an unbalanced bullet.

On twist, a 1 in 9 should handle anything from 40-73gr, some might handle heavier 75-77gr, but not likely. Longer barrels can handle heavier bullets than short barrels, since the increased muzzle velocity means the bullet is spinning faster.
Thanks, that's good to know. I assumed mine just didn't like the 62 gr. bullets. I didn't think the ammo could be that poor. Oh well, you know what they say about assuming. I've got some 60 gr hollow points that I'll be working up a load for soon. That will hopefully give me a better idea of what the mini thinks about 60gr bullets. So far my best groups have come with 55gr.
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Old 06-16-2012, 08:26 PM   #24
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I was told you need to run about 500 rounds though your mini to break the barrel in.
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Old 06-17-2012, 08:17 PM   #25
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Default Accuracy

If I can get my barrel clean and "conditioned" in time, I'll try the 100 yd accuracy challenge.

The strut modification is supposed to shrink groups 50% for about $98

The barrel compensator/weight - pinned not threaded - supposed to help as well.

Hardware expense or spend the $200 on a different variety of ammo ? Any ideas ?
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Old 06-18-2012, 04:08 AM   #26
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Get a strut and condition the barrel, you will be pleasantly surprised!
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Old 06-18-2012, 05:00 AM   #27
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Supposedly grinding the face of your operating slide so it doesn't contact the gas block gives a great boost in accuracy. That may have been Ruger's design, but tolerences in manufacturing allow the op slide to contact the gas block. I've done this but have yet to try it out. Makes sense, the M1 and M14 don't have the op slide rest on the gas block.
http://outlands.tripod.com/armory/mini-14.htm
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