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Old 06-23-2009, 08:13 PM   #1
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I need to push a 175 gr. Sierra Match King .308 to between 2600 and 2700 ft/s. I need them to also be as clean as possible and need them to be dead nuts consistent out of a cold, fouled barrel, using fire formed M118 brass.

Ready, set, go!

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Old 06-23-2009, 08:17 PM   #2
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is this for your M14 project? Because barrel length and the fact that you need to bleed some of that gas to cycle the op rod will come into play as well.

Bullet Name
Diameter inches .308 dia
Weight grains 175gr
Sectional Density .264

Ballistic Coefficients.
.505 @ 2800 fps and above
.496 between 2800 and 1800 fps
.485 @ 1800 fps and below

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Old 06-23-2009, 08:32 PM   #3
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It'll be an 18 inch Krieger, medium heavy, chromoly barrel on a match grade M14 with a chamber cut for M118LR.

Pride Fowler says that the reticle on their RR800-1 is calibrated for the 168 gr. Sierra Match King traveling at 2700 ft/s and the 175 gr. traveling at 2600 ft/s.

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Old 06-23-2009, 08:47 PM   #4
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Keep in mind that I've never reloaded a single bullet in my entire life.

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Old 06-23-2009, 09:17 PM   #5
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Damn, I had this big long post - and it probably amounted to nothing - but I lost it when I hit Reply.

I'll leave it at this. There are much more qualified people than I to answer this question.

JD

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Old 06-23-2009, 09:32 PM   #6
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Quote:
Originally Posted by Dillinger View Post
Damn, I had this big long post - and it probably amounted to nothing - but I lost it when I hit Reply.

I'll leave it at this. There are much more qualified people than I to answer this question.

JD
Where is Robo these days?
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Old 06-23-2009, 09:43 PM   #7
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Quote:
Originally Posted by matt g View Post
Where is Robo these days?
I don't know - He has been popping in from time to time, but me thinks he is off doing his Superhero thing...

cpttango is an excellent source, if you can put up with him ( ) - He should be along shortly and he can help you, I am sure.

I was just going to point out that 2700 fps from a short barrel ( meaning hotter round as it leaves the brass ) is going to lead to some tuning issues with the pressure being seen by the operating rod and action.

But, again, I only dabble in this field and am NO EXPERT....

I look forward to seeing the finished project. Too bad you live in Kalifornia - a threaded flash hider and a screw on can like Shurgart had in Black Hawk Down would be an AWESOME SHTF weapon.

JD
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Old 06-23-2009, 09:59 PM   #8
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Quote:
Originally Posted by Dillinger View Post
I don't know - He has been popping in from time to time, but me thinks he is off doing his Superhero thing...

cpttango is an excellent source, if you can put up with him ( ) - He should be along shortly and he can help you, I am sure.

I was just going to point out that 2700 fps from a short barrel ( meaning hotter round as it leaves the brass ) is going to lead to some tuning issues with the pressure being seen by the operating rod and action.

But, again, I only dabble in this field and am NO EXPERT....

I look forward to seeing the finished project. Too bad you live in Kalifornia - a threaded flash hider and a screw on can like Shurgart had in Black Hawk Down would be an AWESOME SHTF weapon.

JD
Indeed. SEI ships all of their rifles to the military with direct connect cans.
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Old 06-23-2009, 10:13 PM   #9
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Try this reference: 25 loads available in .308 Winchester with bullet weight equal 175

You are going to need a chronograph to be sure your shorter barrel is wringing out he velocity you need. I would stick to the faster burning powders like H-335, W-748, BLC-2 and maybe Varget.

Varget may be the ideal answer. It seems to give outstanding accuracy in most guns. You have a daunting task of putting together an accurate, clean, consistant load that leaves the muzzle at a prescribed velocity. Good luck with this project. Prepare to burn some powder.

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Old 06-23-2009, 10:24 PM   #10
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that is easy put them 175gr SMK over some good VV N550 or 540.

VV powder are the cleanest I have used. You can also try 42 to 43gr of RL15 that is the go to load of a few F-class shooters I know.

RL17 is a new powder and supposed to give high velocity with normal pressure.

Check 6mmbr.com's 308 page for some very good very accurate load data. http://www.6mmbr.com/308Win.html

vv308.jpg

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