First time reloaders first 25 test shells 300 win mag

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brodymcg

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First batch of shells I have ever reloaded. 300 win mag

Currently sized primed and Ready for bullets and powder tomorrow night. Pretty excited hopefully they hold together :p

Cheers
Brody

(72grs +\- .5 of a grain Vitavhouri N560 pushing a 208gr Hornady AMAX i think :p)
 
Good for you, I started reloading about a year ago and when I took my first batch of .308's out to the range, I was nervous. Did I do everything correctly, headspace, trim, right amount of powder, primers and C.O.L. Etc. I think if you have been careful, read the books, watched the you tubes, it's all good and you will be hooked on reloading. I am and have now shot 1000's of my own loads and thrilled with the accuracy.
 
Hi
I'm with litledab on this, I think your load is over max from any reputable load data I've seen. I've used 20+ lbs of VV powder over the last 10 years but have never reloaded 300 Win Mag so I'm not an expert. I think it would be prudent to just do one last check of the data before touching these off.
 
I've been safely reloading for many years. I was taught to consult at least three different reloading manuals as a check and balance (because manuals do contain errors). I've historically used the average of the multiple manuals' data and proceeded from there. Not everyone's method but it has worked well for me.

Just my two cents.
 
Case capacity between brands differs a lot with 300 wm. What's safe in Winchester brass will flatten primers in Remington brass. Where did the OP get his data and what brand of brass was stated in the manual.
 
That seems to be a very hot load. It is critical that you always start with a START load. I have seen rifle with severe pressure signs at the Start load. You are starting with a load that is over max in all my books.

Do you have any more brass? Can you load 5 at 68, 5 at 69 and 5 at 70?
 
I think from the OP's remarks he was heading to the range last night or today. He should have started his load development @ around 68gr's as Ganderite suggested. wow.
Lets hope the young fella is okay.
 
I like to start working up a load by starting at the suggested starting charge and working up in singles in .2 gr increments. While shooting them, do a ladder test. Work your way up until you find pressure signs, then stop.

Once you have your optimal charge (usually not the max charge), you could do 3 or even 5 shot groups, with each group varied by changing the seating depth by approximately 5 thou starting from suggested OAL, working your way towards the rifling lands.

This method seems to be the most efficient for me.

So much fun!
 
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For all of those wondering i got the load data from an old friend i work with that I trust very well. He uses the QuickLoad program that shows all the pressures peaks ect. I can take a picture of the document if you like. I was trying to replicate a load from a friend who I also trust very well with a 208gr AMAX using Reloader 22. Yes the loads are fairly hot but i checked each of brass no signs of stress, was easy to extract after shot, no extractor marks, primers not flatened or pushed out of primer pocket.

Sorry for giving everyone a scare but yes I had quite a bit of help developing this load, i did not do the load data on my own.

Cheers Brody
 
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