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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 05-20-2013, 10:54 PM
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high_revs high_revs is online now
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Default sub-150gr .308 or 7.62x51

i have a noveske N6 upper. i was informed the recommended ammo is 150gr and above. been shooting 168gr and 175gr. gets kinda expensive for plinking obviously. (and it ain't cheap already shooting that caliber).

it's hard to find surplus or cheap'ish ammo lower at 150gr and above. i figure *maybe* a lighter bullet like 149gr or 147gr will not stabilize with a 1 in 10" (polygonal rifling). maybe keyhole?

what would be "too light" for a 1 in 10" twist rate. any here experiences with shooting lower grain like 149 and 147?
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Old 05-21-2013, 12:10 AM
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E92335i E92335i is offline
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I've been shooting PPU 145 grain and PMC 147 grain on my Ruger scout and R700. No issues so far! Accuracy is great at 50 and acceptable at 100 yards for plinking. For groups, I use FGMM 168 or 175 grain.

The most accurate plinking ammo I've used is Fiocchi 150 grain FMJ.

You can use Fusion 150 grain or Nosler Ballistic if you want great accuracy and won't break your bank.
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Old 05-21-2013, 12:26 AM
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Standard .308/7.62 is 147/150 grain bullets. You'll have bigger worries than a 3 gr difference when shooting for accuracy. Also, for lighter bullets, the concern is OVERstabilization. That would be something like like firing a 100gr .308 dia slug down a 1/10 twist. The bullet doesn't tumble, instead, it's often a small but possibly but not always a noticeable decrease in accuracy and possibly decreased wounding effects with FMJ(See m16 1/14 vs 1/12 vs 1/7 twist rates with regard to 55gr m193). Under stabilization happens when you use a bullet too heavy for the twist rate, in your case, would probably be using bullets over 200gr in your rifle. the symptom of under stabilization is where you see keyholeing on your target along with shooting patterns rather than groups. (see M16 on firing 62gr m855 out of the M16A1, there is an army field manual that gives a visual explanation of 100yd groups vs patterns)
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Old 05-21-2013, 6:34 AM
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168gr and 175gr SMK/Hornady/Speer bullets are not for plinking, the are 500-1000 yard match bullets and a waste of your money if your using them on the 50-100 mall/ninja sniper line.

Simple low powered (2400-2600) 150 grain reloads (38-40 grains powder) with GI 147 bullets seated out .060" and single loaded will get you an average 1"- 1.5" groups at 100 yards out of a decent mid quality barrel.

Save the 168/175 match bullets for long range.
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  #5  
Old 05-21-2013, 7:07 AM
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thanks! i even saw some federal before but wasn't sure. definitely cheaper to plink with.
Quote:
Originally Posted by E92335ti View Post
I've been shooting PPU 145 grain and PMC 147 grain on my Ruger scout and R700. No issues so far! Accuracy is great at 50 and acceptable at 100 yards for plinking. For groups, I use FGMM 168 or 175 grain.

The most accurate plinking ammo I've used is Fiocchi 150 grain FMJ.

You can use Fusion 150 grain or Nosler Ballistic if you want great accuracy and won't break your bank.
sorry Cheezle. I had that backwards on effect of bullet weight and twist rate. (posting very late last night). i'll get a few to try. i was reading alst night if too light, might even destroy the bullet if it's too light in a high'ish twist rate.

Quote:
Originally Posted by Cheezle56 View Post
Standard .308/7.62 is 147/150 grain bullets. You'll have bigger worries than a 3 gr difference when shooting for accuracy. Also, for lighter bullets, the concern is OVERstabilization. That would be something like like firing a 100gr .308 dia slug down a 1/10 twist. The bullet doesn't tumble, instead, it's often a small but possibly but not always a noticeable decrease in accuracy and possibly decreased wounding effects with FMJ(See m16 1/14 vs 1/12 vs 1/7 twist rates with regard to 55gr m193). Under stabilization happens when you use a bullet too heavy for the twist rate, in your case, would probably be using bullets over 200gr in your rifle. the symptom of under stabilization is where you see keyholeing on your target along with shooting patterns rather than groups. (see M16 on firing 62gr m855 out of the M16A1, there is an army field manual that gives a visual explanation of 100yd groups vs patterns)

yeah.. i know. i don't put that many but it's enough so far. i couldn't find surplas ammo (or cheap ones) that were 150gr and above. so i stuck with what i had planned for more long distance when i was stocking up. (reloading in plans, but not there yet). i think i bought all my ammo for this as the panic started subsiding after Obama won his 1st election. so prices "seemed" decent, got whatever i can get my hands on back then (which were all match ammo unfortunately). i don't shoot them much on the 100yd line. just mostly when i wanted to try buis, zero in scopes, switch scopes between both ar10, zero again for a clinic, etc. but yeah, those little activities started using up a little ammo. i practically stop at probably 30 or 40 knowing how much i've spent already at that point. most was 60 for both rifles at the 300 yd line @ sac valley.

Quote:
Originally Posted by 6mmintl View Post
168gr and 175gr SMK/Hornady/Speer bullets are not for plinking, the are 500-1000 yard match bullets and a waste of your money if your using them on the 50-100 mall/ninja sniper line.

Simple low powered (2400-2600) 150 grain reloads (38-40 grains powder) with GI 147 bullets seated out .060" and single loaded will get you an average 1"- 1.5" groups at 100 yards out of a decent mid quality barrel.

Save the 168/175 match bullets for long range.
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  #6  
Old 05-21-2013, 3:05 PM
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I reload and shoot lots of pulled 147gr bullets in my REPR (LWRC). For 200 yards and under they are just fine for range fodder, going out to 300 they start to drop accuracy quickly.
Last time I bought a big batch they were $125 per 1k (had to order 5k)
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