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

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Old 12-11-2002, 17:28   #1
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i've seen some 80 grain bullets before, i think on Midway USA. what is the heaviest bullet you've seen for a .223, and could i shoot such heavy bullets from a mini-14?
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Old 12-11-2002, 18:24   #2
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I've not seen the 80 grn. I have fired 69 grns. My 196 series mini likes the 63 gr. better. The newer mini's have a 9" turn riflings, while the older mini's have a slower 10" turn. I believe the 10" mini's shoot well up to 60 grns, while the newer mini's shoot up to the heaver 69 grn bullets. The faster turn rate is needed to stabilize the heaver bullets.

Now for some trivea. You sight in your mini using 45 grn bullets at 3600 ft/sec. Now you put in some heavier slower 63 grn bullets at 3000 ft/sec. Where will the POI (Point of Impact) be on the target with the heaver bullets?.......Ans. Higher.
Why?....Because the heavier bullet is slower getting out of the barrel. Since the recoil of the barrel is upward, the muzzle is higher by the time the bullet leaves the barrel.

Since each mini is different only buy a box or two to see if your mini likes em, before buying a large quant. Just my 2 cents
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Old 12-11-2002, 18:54   #3
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thanks cajungeo
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Old 12-11-2002, 22:22   #4
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What's your rate of twist? There is a 100 grain .224 bullet out there if you feel like sending it down a 1/7 or 1/8 bbl......
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Old 12-12-2002, 15:38   #5
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Sounds like they are trying to make a 7.62x39 out of a .223.
100 grains vs 122. Effective range of 300 yards, due to looping trajectory for both.
With the 7.62x39 Uly hp's you get immediate and extreme fragmentation, at least at ranges of 25 yards and under. In gel it looked better than the 100's did. It worked about as well on water jugs at 50 yards as Barnaul sp's. Beyond that range I don't know how it would work.
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Old 12-12-2002, 21:50   #6
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The 80 grain Sierra Match King bullet was introduced in 1992 for service rifle competitors and specifically designed for the 600 yard stage. The 80gr bullet must be seated to an OAL of around 2.550" due to it's length and therefore will not fit either AR or Mini magazines. Luckily, the 600 is a slow fire stage, so single feeding is the norm. This bullet requires a twist of 1X8" or 1X7" to properly stabilize.

Who makes this 100 gr .224? That's getting a little nuts if you ask me. The 80 can be safely loaded to only around 2600 fps. I can't imagine anyone actually selling a 100gr .224. The thing would be just too big for the .223's capacity to push!
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Old 12-12-2002, 23:02   #7
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I have a 6.5 Carcano that I use the same type and amount of powder that I use for the .223. The Carcano uses a 140 or 160 grain .268 bullet.

Long skinny bullets. I imagine you would run into a chamber limitation at some point in the .223.

Dennis Jenkins





QUOTE]Originally posted by reloader
The 80 grain Sierra Match King bullet was introduced in 1992 for service rifle competitors and specifically designed for the 600 yard stage. The 80gr bullet must be seated to an OAL of around 2.550" due to it's length and therefore will not fit either AR or Mini magazines. Luckily, the 600 is a slow fire stage, so single feeding is the norm. This bullet requires a twist of 1X8" or 1X7" to properly stabilize.

Who makes this 100 gr .224? That's getting a little nuts if you ask me. The 80 can be safely loaded to only around 2600 fps. I can't imagine anyone actually selling a 100gr .224. The thing would be just too big for the .223's capacity to push!
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Old 12-13-2002, 03:09   #8
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I have heard Blackhills makes a 100 grain bullet that when load will fit in the mag. I Found this over at ar15.com.


100 grain bullet results
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Old 12-13-2002, 06:43   #9
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cajungeo: Why?....Because the heavier bullet is slower getting out of the barrel. Since the recoil of the barrel is upward, the muzzle is higher by the time the bullet leaves the barrel.

Not just that. Recoil generated by a heavier bullet is greater by (63grn * 30) / (45grn * 36) = 16.7% - that is besides timing considerations.

P.S. It would be possible to increase the weight of a 62 grn bullet to about 85 by substituting, say tungstein carbide in place of led. Of course to keep fragmentation characteristics, instead of a single slug the core would have to be comprised of several separate cylindrical sections.

BTW - the 100grn .223 bullet is way longer than any .223 ammo but it still loads to normal length - so it fits AR and Mini magazines. Probably some trickery with the powder.

Voruzon
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Old 12-14-2002, 11:30   #10
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Originally posted by cajungeo
You sight in your mini using 45 grn bullets at 3600 ft/sec. Now you put in some heavier slower 63 grn bullets at 3000 ft/sec. Where will the POI (Point of Impact) be on the target with the heaver bullets?.......Ans. Higher.
Why?....Because the heavier bullet is slower getting out of the barrel. Since the recoil of the barrel is upward, the muzzle is higher by the time the bullet leaves the barrel.
I think there are a lot of other things to consider here. The trajectory of the two bullets will be different. Gravity still works the same. The muzzle rise may be more with the heavier bullet, but because it is traveling slower, it takes longer to get there, it will drop more after covering the same distance (32ft/sec/sec). The muzzle rise and trajectory are offsetting factors. Also, you have to consider what range the Mini is sighted in at versus what distance your target is. Since the bullet passes through the theoretical scope line of sight twice during its flight path, it depends where in the trajectory your POA is. If your target is 300 yards away with a Mini sighted in at 100 yards, I'll bet you anything that the heavier bullet will land lower on your target.
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Old 12-14-2002, 17:09   #11
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The muzzle rise may be more with the heavier bullet, but because it is traveling slower, it takes longer to get there, it will drop more after covering the same distance (32ft/sec/sec).
If your target is 300 yards away with a Mini sighted in at 100 yards, I'll bet you anything that the heavier bullet will land lower on your target.
satan I had it sighted in at 100 yds. the 63 grn POI was about 6" higher than the 45 grn. without touching the scope. I do know the heavier bullet will retain its energy longer, and at some point will be faster, and drop less than the lighter bullet. At 300 yds, sighted in at 100 the 63 gr will hit lower on the target.

Also if you fire a bullet parallel to the ground, drop a bowling ball, and a raisen, all at the same time, and from the same height off the ground, they will all hit the ground at the same time.
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Old 12-15-2002, 17:22   #12
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Originally posted by cajungeo
Also if you fire a bullet parallel to the ground, drop a bowling ball, and a raisen, all at the same time, and from the same height off the ground, they will all hit the ground at the same time.
...In a vacuum, yes.

Not arguing with you, but there are just more factors to consider for your question. I like that though - makes me think about the physics involved.
I would have expected it to impact a little closer than 6" higher, but hey, what do I know?
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