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-   -   .308 Win. Load Discussion (http://www.firearmstalk.com/forums/f30/308-win-load-discussion-12111/)

SlamFire 03-22-2009 06:07 PM

.308 Win. Load Discussion
 
308 Win. --

Working up loads for a Rem. 700P (Police), Leupold Mark 4, 6.5 - 20x 50mm LR/T optics.

I'm running once fired Federal Match brass, trimmed to 2.005"

Deburred, polished necks

Reamed/seated primer pockets, reamed flash hole.

Hodgdon 4895, Hodgdon 335 . . .

And looking at Hornandy or Sierra bullets . . . I have 150 gr. 165 gr. 195 gr.

New rifle here and have neve loaded this caliber for "accuracy" off the bench.

300 / 500 metre ranges. What's the optimal bullet weight? Load/charge?

When I get this brass "fire formed" I'll be neck sizing rather than FL.

I yield the remainder of my allotted time to my esteemed colleagues :D

mrm14 03-22-2009 07:02 PM

I have been using Berger 175 grain match target BT part number 30409 bullets in my M1A loads for 500 to 600 yard target and they work very well for this range in this rifle. Different grain weight may work work better in bolt rifle but I'm not sure. My 1000 yard rifle build is a Remmy 700 in .300 Win. Mag. and I intend to use Berger 210 grain match target BT Long Range part number 30419. Krieger is building my barrel with the rifleing rate to match this bullet weight as per Berger's recomendations. I dont think this would be proper weight grain for .308 Win. however. Actually, if you go to the bullet manufacture catalog or web sites you will find that they recomend the barrel rifleing twist rate for their various grain weight bullets that they sell. Know the twist rate rifleing of your barrel, use the factory bullet weight they recomend for your twist rate,and I think this would be a good grain weight starting point when developing your loads for your target rifle. My 2 cents worth.

SlamFire 03-22-2009 10:17 PM

Rem 700 P runs 12" on the rifling.

I just loaded 42 gr. Hodgdon 4895 and 150 gr. Win. PP bullets. I had them lying around and figure this will be a starting point while I "fire form" for the bolt action and get a .308 Win. neck sizing die.

I have 165 gr. and 190 gr. bullets. What's the theory on bullet weight for long range -- as in circa 1000 metres?

Heavier bullet, more interia?

Lighter bullet, more velocity and flatter trajectory?

Surfin' the Hornady site now . . .

mrm14 03-22-2009 10:45 PM

Velocity usually #1. But as I understand it, weight and the inerta it can help carry distance, plays a role also. As I've been reloading for longer range accuracy for a just short while, and I've acquired my info I have to date from Krieger, Berger, and a couple of older semi retired long range 'F' class shooters, my knowledge is limited to what I've picked up over the last 6 months or so. I'm sure there are others on this forum that have been developing long distance target loads for a long time now that can explain better the correlation between velocity and bullet weight.

cpttango30 03-22-2009 11:05 PM

Your 190gr will not shoot out of a 12 twist. 175 and under for a 12 twist.

the heaiver bullet is like a bigger car if you are driving a geo metro at 55mph and let off the gas the car is going to come to a stop sooner than a Surburban going 55mph. The more mass takes more power to get going bit once it gets going it is harder to stop. the heaiver bullets will stay supersonic longer than lighter bullets.

For long range like F-class you want a heavy bullet because you need the bullet to stay supersonic to 1000 yards. The lightest bullet I found on the line was 175gr. most were shooting 185gr or 190gr.

I got a buddy that shoot a lot of f-class and builds custom rifles for f-class and or tactical. He like using 175gr SMK pushed by a stiff load of Allient Reloader 17.

RePete 03-23-2009 12:46 AM

Quote:

Originally Posted by SlamFire (Post 85442)
308 Win. --

Working up loads for a Rem. 700P (Police), Leupold Mark 4, 6.5 - 20x 50mm LR/T optics.

I'm running once fired Federal Match brass, trimmed to 2.005"

Deburred, polished necks

Reamed/seated primer pockets, reamed flash hole.

Hodgdon 4895, Hodgdon 335 . . .

And looking at Hornandy or Sierra bullets . . . I have 150 gr. 165 gr. 195 gr.

New rifle here and have neve loaded this caliber for "accuracy" off the bench.

300 / 500 metre ranges. What's the optimal bullet weight? Load/charge?

When I get this brass "fire formed" I'll be neck sizing rather than FL.

I yield the remainder of my allotted time to my esteemed colleagues :D

Your running a fine rifle.

Lose the Federal Brass it's too soft and the primer pockets get too loose too quickly and get Winchester, LC Match or Norma.

Stick with the 168's and 175's. I've stopped using Sierra's because the Nosler's are cheaper and they go in the same hole as the Sierra's.

For powder use H4895, RL15.

I use small base dies for my .308 loads and load to 2.80" OAL.

SlamFire 03-23-2009 04:02 AM

Did we ever decide on twist rate for a 190 gr bullet? I have two other guns for this dia. bullet -- both 30-06.

cpttango30 03-26-2009 02:58 AM

Quote:

Originally Posted by SlamFire (Post 85633)
Did we ever decide on twist rate for a 190 gr bullet? I have two other guns for this dia. bullet -- both 30-06.

I stand corrected both Berger and Sierra state a 12" twist will work for a 190gr. bullet. The only way to know for sure is to buy a box and try them out.

SlamFire 03-26-2009 12:39 PM

Quote:

Originally Posted by cpttango30 (Post 86986)
I stand corrected both Berger and Sierra state a 12" twist will work for a 190gr. bullet. The only way to know for sure is to buy a box and try them out.

OK, I found the twist data for bullet weight on the Berger site. Where is it on the Sierra site? Eh? :confused:

cpttango30 03-26-2009 01:08 PM

Not on their site in their book.


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