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-   -   Finally some results from the .308 (http://www.firearmstalk.com/forums/f30/finally-some-results-308-a-80568/)

dustinoif3 01-07-2013 02:15 AM

Finally some results from the .308
 
As some of you may remember I've posted numerous threads the last 4 months or so about coal, ogive, measurements to the lands, powder and neck vs full length size. I appreciate all the input I've gotten and I'm here to finally post my test.

Remington 700 sps tactical
40 deg

40

dustinoif3 01-07-2013 02:21 AM

2 Attachment(s)
40 degrees and zero value wind.
Cci large rifle, black hills brass neck sized, cfe 223 powder, 168gr hornady a max. Powder charges: 47gr, 47.5, 48,48.5 and max load at 49. Here are the pics that have my two best groups with 48gr and 49. I fired 25 rounds today and had some eye fatigue at the end. I believe I can shoot the 49gr tighter. Let me know what you guys think. Also these are 5 shot groups at 100. Stupid me yanked one right on the 48gr

aandabooks 01-07-2013 02:27 AM

Nice shooting. One heck o a group you had in the 48 gr if you hadn't pulled that one shot. Still better than I can normally do.

dustinoif3 01-07-2013 02:41 AM

Thank you. I was very happy(except for the one of course). What's crazy is that my start grain of 47gr looked like I shot 00 buck at it. Might of been 4moa? Maybe larger. Didn't measure because it was gross. It tightened up real quick then went out a bit then back in. I really want to re shoot the 49gr because its suppose to fly 100 fps faster than the black hills I use to shoot

willfully armed 01-07-2013 08:47 AM

Chronos lie.


Load development should be in 1/10gr increments. Setting 0.010-0.015 from the lands( normally). Find what charge yields the best results, then try different primers.

New brass?

dustinoif3 01-07-2013 11:22 AM

1 Attachment(s)
Yes. I wanted to be close to the lands but once I loaded one .015 off it was so long I couldn't load it into my mag. Even at .030 off it wouldn't fit. I ended up just making it long enough to just fit the mag. Also I agree with the .10gr increments but due to not being able to buy 168gr bullets anywhere I used half grain to conserve a little. Here's a pic of a round .015 and one that fits the mag.

dustinoif3 01-07-2013 11:23 AM

Quote:

Originally Posted by willfully armed
Chronos lie.

Load development should be in 1/10gr increments. Setting 0.010-0.015 from the lands( normally). Find what charge yields the best results, then try different primers.

New brass?

Brass was once fired from my rifle

Txhillbilly 01-08-2013 01:22 AM

Quote:

Originally Posted by dustinoif3 (Post 1083746)
Yes. I wanted to be close to the lands but once I loaded one .015 off it was so long I couldn't load it into my mag. Even at .030 off it wouldn't fit. I ended up just making it long enough to just fit the mag. Also I agree with the .10gr increments but due to not being able to buy 168gr bullets anywhere I used half grain to conserve a little. Here's a pic of a round .015 and one that fits the mag.

When your trying to get the very best groupings from your rifle,you'll find out that almost any bullet will shoot best when it's getting close to the lands. The problem with most production rifles are that they have long throats,and your COAL will almost always be longer than magazine length.
So you have to decide whether you want the very best shooting loads for your rifle,or the very best loads that fit in your magazine!!!

I disagree with Willfully Armed to a point.
When I start loading test loads for any given bullet,I always load in .5 gr or 1.0 gr increments. There is a sweet spot in every barrel,and there's no need in wasting a bunch of time/money loading each test load set .1-,2 gr's apart.
Since your 48.0 gr and 49.0 gr loads shot best,I'd start over with loads at 48.0 and work them up to 49.0 at .2 gr increments now. Then where ever they shoot best,load some at .1 gr increments on either side,and see if they tighten the groups up even more.

dustinoif3 01-08-2013 04:43 AM

Quote:

Originally Posted by Txhillbilly

When your trying to get the very best groupings from your rifle,you'll find out that almost any bullet will shoot best when it's getting close to the lands. The problem with most production rifles are that they have long throats,and your COAL will almost always be longer than magazine length.
So you have to decide whether you want the very best shooting loads for your rifle,or the very best loads that fit in your magazine!!!

I disagree with Willfully Armed to a point.
When I start loading test loads for any given bullet,I always load in .5 gr or 1.0 gr increments. There is a sweet spot in every barrel,and there's no need in wasting a bunch of time/money loading each test load set .1-,2 gr's apart.
Since your 48.0 gr and 49.0 gr loads shot best,I'd start over with loads at 48.0 and work them up to 49.0 at .2 gr increments now. Then where ever they shoot best,load some at .1 gr increments on either side,and see if they tighten the groups up even more.

Thx tex. I hope to get some more loaded sometime this week. I'll try a couple up from 48 and a couple down from 49 in .2 increments. For some reason 48.5 didn't produce a very good group.

DaTexanBoy 01-08-2013 12:56 PM

Yeah no need in doing .1gr increments when doing initial workup for a rifle. I start at min then jump up one full grain, then start going .5gr from there until max. You'll find a good spot in there.

Once you find a spot you like, I would work between those in .2 increments. Example, in my 7mm RM I group between .500"-.600" at 57gr of IMR4350. I plan to go down to 56.5 and up to 57.5 in .2. If I stay with 57, then I'll start easing my OAL a little longer. Right now I am .025 off the lands, but my rifle seems to like it. Each rifle I different to what they like.

Nice shooting though.


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