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-   -   .308 reloads (http://www.firearmstalk.com/forums/f30/308-reloads-49989/)

phammily 10-17-2011 12:02 PM

.308 reloads
 
Started to try some thing new. I put 3.5 grains less then listed in the reloading book and got 1/2in better grouping. Just wanted to throw it out there.

BlueTurf 10-17-2011 01:54 PM

There seems to be a big difference between the different reloading manuals in their suggested powder charge ranges for the same cartridges and bullet weights. I know bullet design is part of the reason for the difference but the powder charge range can vary greatly with the different manuals. With my limited expertise I always play it safe and stay within the suggested guidelines for the different bullets.

BlueTurf 10-17-2011 02:02 PM

Oh, by the way, 41.5 grains of IMR4064 with a Hornady 168-grain A-Max bullet works very well in my Savage bolt-action .308. The C.O.L. is 2.80. 42.0 grains of IMR4895 with a Sierra 168-grain Matchking bullet produces great results also. The .308 is fun to load for.

oldpapps 10-17-2011 04:12 PM

3.5 grains less than listed in the reloading book
 
This scares me. 3.5 grains less than what listing? Max or starting load?
If below the Max listing,. I would hope so. If below the starting load, did you ever hear of detonation?
Fifty years and 100 pounds ago I was a skinny kid just starting to reload. I was loading for a British 303 and determined that I wanted to load some light loads. The first one fired detonated and froze the bolt. Eventually I got the bolt to open and the case head had flowed back into the bolt! I was lucky. I still have and shoot that rifle. Get the point?

As for getting better accuracy by adjusting your load. That is the name of the game. After selecting you bullet and powder, load a sample (I normally go with 5 rounds) within the bracket of minimum and maximum as listed in a loading book that I trust (I will compare several book's data.) Depending upon the amount of spread, I will load a number of samples. This is with fully processed and consistent brass and the same primer type. Then test fire each group in order, looking for any pressure signs as I go. As each test group is fired at different paper targets, I will get a good idea where the 'sweet spot' is going to be for that weapon. There is no rime or reason to which loading combination will work better or worse in a given weapon. The results are some powder charges will work better or worse. I load for two different M1 Garands and they don't like the best loading for the other. :( The good news is the loading for the SPFD is so close to the preferred loading for my 03A3.:)

Things to be picky about: trim length of brass (bottle neck cases stretch fast) - over all length of the loaded round (bullet seating depth). These can cause extreme pressure changes fast!

Sorry about the long post, my 4 year old grand daughter doesn't care.;)

Always error on the side of safety.


OSOK

robocop10mm 10-17-2011 09:55 PM

Many do not recognize the term "Book Load". Most books list a range of loads from starting load to maximum load. The Max load is NOT the Book Load!

3 1/2 grains under max is generally a very good accuracy load. My .308 load is about 2 grains under book max.

BlueTurf 10-17-2011 10:53 PM

Good point robocop10mm.

lonewolf101 10-17-2011 11:51 PM

Quote:

Originally Posted by BlueTurf (Post 603411)
Oh, by the way, 41.5 grains of IMR4064 with a Hornady 168-grain A-Max bullet works very well in my Savage bolt-action .308. The C.O.L. is 2.80. 42.0 grains of IMR4895 with a Sierra 168-grain Matchking bullet produces great results also. The .308 is fun to load for.

I have had good results using varget and a 165SST 41.7 grains out of my savage

oldpapps 10-18-2011 04:50 PM

Quote:

Originally Posted by robocop10mm (Post 603750)
Many do not recognize the term "Book Load". Most books list a range of loads from starting load to maximum load. The Max load is NOT the Book Load!

3 1/2 grains under max is generally a very good accuracy load. My .308 load is about 2 grains under book max.

I stand corrected.
Several years ago I had a boss that put a fish bowl on her desk and anyone who used an acronym that she didn't understand had to put a dollar in the bowl. I didn't like her.
So, my apologies for not understanding your 'Book Load'. To this I say 'SWIKE0'. Opps there goes another dollar. (That means to start over from the preset condition.)


Enjoy.

OSOK

phammily 10-24-2011 09:54 AM

Yea nolser 180grain with 40grain 2209 powder


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