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post #1 of 12 (permalink) Old 03-17-2016, 10:51 PM Thread Starter
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finding conflicting load data

so im loading up some 308 for my rem 700. i found a chart from imr powder which states that for a 165 gr bullet using 4064 powder the starting load is 42 gr and the max is 46.3.
i found a sierra chart for the 165 game king i am using that says starting is 37.6 and max is 43.5 using 4064 powder.
who do i believe the power manufacturer or the bullet manufacturer?
Any one here use the 165 sierra with 4064?

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post #2 of 12 (permalink) Old 03-17-2016, 11:12 PM
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Re: finding conflicting load data

Different chambers/barrels different pressures, different powder lots different pressures, different primer brands different pressures, different brass different pressures, different temps different pressures. Any data is a suggestion and will always come with a disclaimer to start at the low end and work up watching for pressure signs.

I had a 700 in 300 Ultra that even at a mid load would crush the brass inward, ignition wouldn't expand the brass and the gas would come around the case and crush it. I loaded that significantly over max without pressure signs.

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post #3 of 12 (permalink) Old 03-19-2016, 08:25 AM
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Re: finding conflicting load data

Reloading manuals are nothing more than a guide. Always start low and work up. Stop when you see pressure signs.

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post #4 of 12 (permalink) Old 03-20-2016, 11:59 AM
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Re: finding conflicting load data

I'm looking at a Sierra loading manual as I'm typing this.
Reccomended starting load using imr 4064 is 39.6 gr with
44.9 being max with 165 gr bullets in a 308. Bear in mind there will be differences between the various manuals.
Also they tend to recommend loads on the safe side.
Id personaly be loading 1 round each with 1 gr increases
and shoot over a chronagraph starting at 40 gr. When you start to see pressure signs stop and back up a grain.
You will now know the max for that gun with that load after
firing just a few rounds. I personaly prefer 4320 as it is
easier to throw consistant charges thru the powder measure
due to the smaller granules. Load data is very similar to
4064. It was Jack Oconners choice for 06 type cases for that
reason.
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post #5 of 12 (permalink) Old 03-20-2016, 02:09 PM
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Re: finding conflicting load data

I think alot of this has to do with the cya aspect of today's society? I have some pretty old reloading manuals and for the most part the loads are hotter than in some of the newer ones out there? Ofcourse alot of the newer , supposedly better powders aren't in the older editions.
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post #6 of 12 (permalink) Old 03-20-2016, 06:45 PM
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Re: finding conflicting load data

What bullet is it? Spt,Spbt....Spitzer?I maybe able to help you...is there any difference on the coal?I just checked on the 4064 powder and got the same grain specs with the coal at 2.750
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post #7 of 12 (permalink) Old 03-21-2016, 07:14 AM
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Re: finding conflicting load data

Yeah, I'm sure the lawyers got involved from old manuals compared to today's..start low, 2/3 shells and go up a little, let the bolt handle tell you when it's time, always a good indicator as well as a chrony.. Be safe rather than sorry, that 100 fps won't matter anyway.
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post #8 of 12 (permalink) Old 03-21-2016, 09:56 AM
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Re: finding conflicting load data

Go on line and make certain you are using the most recent data. Powders have changed over the years. Powder makes are usually low and bullet makers are usually high.
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post #9 of 12 (permalink) Old 03-21-2016, 02:50 PM
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Re: finding conflicting load data

start where your comfortable and sooner or later you will learn what works and what doesn't. factory guns are always a little easier than customs. but I always try and find the point that there is too much pressure. [censored] if you haven't got the bolt stuck once or twice you must not be trying real hard.

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post #10 of 12 (permalink) Old 03-21-2016, 08:23 PM
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Re: finding conflicting load data

In the early 90's when the first "hog" matches were held in the strip cuts near Carroll town, Pa a guy used to come up from WV I believe brought a .30/378 wea that was so over loaded that with all 15 shots he used a rubber mallet to open the bolt..Old John W told him our paper is not that thick !!!!! I used to leave there scratching my head at times....good ole' days !
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