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.308 tack driver load

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15 years 7 months ago #1176 by Don Gordon
.308 tack driver load was created by Don Gordon
I'm sure a number of you have experimented with different bullets and loads, I'm asking, what have you found to be the most accurate combo of bullet and powder for a .308?

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15 years 7 months ago #1219 by CBnL
Replied by CBnL on topic Re:.308 tack driver load
I like using Winchester brass, Hornady 30503 168 gr BTHP(M) with 48.5 gr of Win760 and a COL of 2.790 and a "Factory" crimp via a LEE Factory Crimp die. I'm right at 2650 fps.
I tried both BTHP and A-Max but the nylon tip of the A-Max could/would get deformed as it was loaded, the BTHP suffered less damage during cycling/loading.

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15 years 7 months ago #1280 by m51chris
Replied by m51chris on topic Re:.308 tack driver load
I have not tried many different bullets, but 44.4 grains of Varget and the 175 grain Sierra match king have worked well for me. I get unexplained fliers with that load, but generally 7 of 10 will go into a 1/2 inch group (100 yards, firing from a bench with improvised rest). The fliers I'm attributing to inconsistent hold...need to keep working on that.

That's quite a contrast to the Indian surplus I tried, which was lucky to make a 5 inch group!


I'm sure a number of you have experimented with different bullets and loads, I'm asking, what have you found to be the most accurate combo of bullet and powder for a .308?

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15 years 7 months ago #1281 by MrMarty51
Replied by MrMarty51 on topic Re:.308 tack driver load
Bullet selections are getting limited and very tough to come by these days,these were the only bullets I can get here locally.I have some 125gr Sierra Spitzer lead nose bullets and I found that using 44 gr. of Accurate 2460 powder is a real good load.
I also have some 175 Hornady HP-BT-Match bullets and using 38.5 gr of the Accurate 2460 powder works very well.
I loaded 3 groups of bullets X 2 and test fired these rounds in My AR10 and I also fired them in My M14
Springfield,Loaded, and the loads i listed gave me the best groups at 100 yards.

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15 years 7 months ago #1284 by CBnL
Replied by CBnL on topic Re:.308 tack driver load
The loads I mentioned earlier give me about 3/4MOA in my bolt action rifle and 1.5 or better in my AR-10(T)
It is all about being consistant. Get you a chronograph to measure the velocity of your rounds.

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I hope this comes out when posted... but you want each bullet to have as close to the same velocity and be as close to the same ~everything~ as possible... that is where your accuracy comes from.
Test # Vel fps Dev off Avg Cartridge Firearm Bullet B.C. Powder Chg gr. C.O.L. Crimp
1 2,660 16 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
1 2,644 0 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
1 2,618 26 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
1 2,627 17 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
1 2,638 6 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
1 2,645 1 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
1 2,654 10 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
1 2,648 4 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
1 2,648 4 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
1 2,660 16 .308 Win AR10T 30503 168gr BTHP(M) 0.450 Win760 48.5 2.790 Factory
Max 2,660
Min 2,618
Spread 42
Sum 26,442
Avg 2,644
SumDiff 100
AvgDev 10
StdDev 14

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15 years 7 months ago #1287 by MrMarty51
Replied by MrMarty51 on topic Re:.308 tack driver load
That is one thing I do`nt have is a Chronograph.NEXT!!
I keep getting these packages coming in from UPS,USPS,FedEx,etc{reloading suppliess,ETC} and the wifey is`nt in a real good humor right now.LOL "Well what do I get" syndrome has hit Her quit hard.
Maby I`d better give it a bit of a cooling off before I get any more packages in the mail,UPS,ETC.
She does`nt understand that after working as a mechanic for over 31 years and am now retired that maby it is time to play just a little.LOL

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15 years 7 months ago #1288 by CBnL
Replied by CBnL on topic Re:.308 tack driver load
Now lots of people will weigh every component... brass, primers, projectiles, etc... the only thing I do is use a powder trickle to make sure each powder load is as exactly the same as I can... then at the end, I do weight each finished round and group them by weight. Usually I'll have 1, 2, or 3 on each end of 100 that I load up... the rest are right in a nice group that varies only by a few tenths of a grain.
I use a LEE case trimmer to make sure all the brass are exactly the same length and that the neck is square to the centerline of the cartridge. I also use a case neck turner to make sure the case neck is a uniform thickness. Those are two other items that can throw off accuracy.

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15 years 7 months ago - 15 years 7 months ago #1296 by MrMarty51
Replied by MrMarty51 on topic Re:.308 tack driver load
CBnL wrote:

Now lots of people will weigh every component... brass, primers, projectiles, etc... the only thing I do is use a powder trickle to make sure each powder load is as exactly the same as I can... then at the end, I do weight each finished round and group them by weight. Usually I'll have 1, 2, or 3 on each end of 100 that I load up... the rest are right in a nice group that varies only by a few tenths of a grain.
I use a LEE case trimmer to make sure all the brass are exactly the same length and that the neck is square to the centerline of the cartridge. I also use a case neck turner to make sure the case neck is a uniform thickness. Those are two other items that can throw off accuracy.

All of the above helps in getting that very fine accuracy.
I have a friend that uses a dial indicator set up on a bed to check that the bullet is properly aligned with the shell.
I had never seen one of those before and thought it was something He made{which He did}to check His bullets just for shooting the Quigley matches with His 45-110 Sharps but then I have seen them for sale in the various catalogs.
Thats what i`d call getting them right down to the super fine stage.
Last edit: 15 years 7 months ago by MrMarty51.

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