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Finding the perfect Load

 
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  #8  
Old 01-29-2013, 05:25 AM
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Re: Finding the perfect Load

Pick the bullet you WANT to shoot and the powder you THINK will give you the best in velocity and loading density

Then run an Audette's ladder (do a search) at .020" off the lands to find the powder charge that will give you the velocity you expect and make sure you are not at or over max

Then run a seating depth test to look for the best group size, extreme spread in velocity and standard deviation in velocity. For example start at .020" off the lands and load 4, then .040" off, then .060" off, etc. etc. until you reach .100" off. Believe it or not, some bullets like to be seated at a good distance from the lands.

You may have to go back and try a slight increase in powder charge if you find a load that is far off the lands and drop farther than you want in velocity. Velocity will drop the farther from the lands you load.

Example:

Audette's




Seating Depth




So I started with a bullet that I wanted to shoot - 130 gr Scirrocco II and a powder I thought would give me the best velocity with a loading density close to 90% and did the Audette's. Ran all the way up to 55 gr loading one bullet at each powder charge (not a lot of wasted bullets/powder/primers there) and found the velocity I expected and wanted without pressure signs.

Then picking the charge of 54.5 gr I did a seating depth test at .015" thru .090" off the lands. Found a decent group at .060" off with the lowest SD and ES

IOW you can get a decent load most of the time with your choices by varying seating depth as the final step
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  #9  
Old 01-29-2013, 08:00 AM
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Re: Finding the perfect Load

Thanks Woods, that's exactly what I was looking for.

I forgot to say what I'm loading for, 7 RUM.

Woods, have you used that 130 gr Scirocco II on Elk?
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  #10  
Old 01-29-2013, 09:35 AM
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Re: Finding the perfect Load

Quote:
Originally Posted by lckytylr View Post
Thanks Woods, that's exactly what I was looking for.

I forgot to say what I'm loading for, 7 RUM.

Woods, have you used that 130 gr Scirocco II on Elk?

No I hunt Elk with my 280AI shooting 160 Accubonds or my 338RUM shooting 225 TTSX's. Have only shot hogs and deer with it here in Texas. SSII's are excellent downrange performers if your rifle will shoot them with acceptable accuracy.

If I were shooting the 7 RUM I would probably try the Barnes LRX 168 gr or look at bullets in the 175 gr range to keep the speed down on the RUM
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Old 01-29-2013, 11:05 AM
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Re: Finding the perfect Load

Quote:
Originally Posted by upacreek View Post
Not trying to be rude but your response is to see what other people claim they use for loads, refrence a manual, and vioalla, sub-moa load? These modern manuals give me low confidence. They don't hardly publish cups or psi, they allow scary pressures for some (like 7wsm) while cut back loads on proven rounds like the 300 h&h. with all the variations in freebore, and components I am looking for some kind of checklist or process to narrow this down.
I bought a 7wsm this year and want to dial it in. With its reportedly high pressures I don't want to screw it up. I also don't want to load 200rds to get there.
Sorry to hijack this thread. I just want some thing technical to study and aid the process.

No what I did was give an easy way to sort through all the options to have good chance to find a load that will work without an undo amount of testing this or that.

Say your shooting a 7 mag and want to go out to 1k, your best choices would be VLD/ULD type bullets, so we go with a Berger 168gr VLD, what powder? Do a search, you see most use H1000 with great success, what primer? You'll also see a lot prefer Fed215M. Your also going to see charge weights from 68gr to 75gr, with most being around 69.5-71, cross reference that with your manuals and you'll see berger lists max 69.5gr. Now you have a good line on a bullet, a powder, a primer, and a good idea where your max charge will be. In short you now have a place to start and have yet to fire 1 round.

I used this method when I decided to try the 180gr 7mm Berger Hybrid in my 7mag. So far I've fire exactly 22rnds and I'm at the point of fine tuning my power charge on a load that's already going 1/2moa. I have my seating depth as well.

I took the OP's post as wondering just where to begin without getting the results you posted previously
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