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300 rum standard deviation,HELP

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Unread 08-03-2010, 03:07 PM
Silver Member
Join Date: Sep 2009
Location: north platte ne
Posts: 387
Re: 300 rum standard deviation,HELP

Thanks for the advice ,iam gona shoot it at a 300,600,and 900 the first cool day we get here .I will proubly give it 5 minutes between shots, I will let u all know how it did, might be a while before i get back though,wish we would get a cold front or somthing.Oh one other thing iam gona borrow a friends chrono too ,and shoot through them both and see how close they are. THANKS AGAIN FOR THE ADVICE IAM SURE I WILL NEED MORE IN THE FUTURE.
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Unread 08-03-2010, 03:40 PM
Silver Member
Join Date: Dec 2008
Location: Dillon MT
Posts: 188
Re: 300 rum standard deviation,HELP

There is a few things that might help. I found that getting neck thickness correct is key when it comes to getting low SD's. I replaced the pilot on my case trimmer with a neck reamer. You can tell quickly if they are doing them all the same or not. Im surprised that your got that many loads out of them i found mine blew out primers pockets way to quickly no matter what the load was.

When i start my load development for larger calibers i look for a low SD before i do anything else. That is if im planning on shooting it long range. Next i found it useless to do load development at anything less then 300 yards and at that i do mine at 500 or farther. It just doesnt tell you anything when you dont do it at a longer range. The groups will vary from doing fairly well at both 100 and 500 to going from .25 moa to well over 1 moa. Its just hard to tell unless you do it at longer distances. Further more finding the right seating depth means a lot.
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