I'm not sure how to combine them, I've changed scopes, stocks and left the suppressor at home which is why they are all over the paper, is there a way of doing it electronically?
Printable View
I'm not sure how to combine them, I've changed scopes, stocks and left the suppressor at home which is why they are all over the paper, is there a way of doing it electronically?
Not easily if you've changed parts of the system or made adjustments so there isn't a consistent reference point. It looks like a rifle or shooter issue rather than a reloading issue anyway.
Like for these 3 groups I adjusted down .5, down 1, and then back to zero and left .5. The POI for all 3 groups is about .1 left of adjusted POA (actually right, but the pic is upside down.....). You can visually imagine them all overlaid and they're all inside the footprint of the largest group, so it's really like a 0.7moa 30rd group.
To actually overlay them I do it in excel and enter the X/Y coordinates then plot them all on one graph
Attachment 261193
e.g. this is the 3 groups above plotted on one graph, overlaid - you can see relative point of impact for all shots. Each group is just another data series. The units on the axes are 0.1MRAD.
Attachment 261194
You can also calculate the radius for all shots from all groups and the overall mean radius.
I can email you a spreadsheet template and instructions if you want
Nice. I am a professional grade spreadsheet fucker-upper (the accountants I used to manage hated me I think) but a play would be niceQuote:
Originally Posted by gimp
I've built a simple spreadsheet tool to overlay multiple groups to understand larger samples of shot distribution and calculate mean radius - I sent to Tentman but if anyone else wants it and the instructions let me know.
Loaded up two sets of 10 rounds with 40 VMAX, to ADI book COL.
BM2 powder, Sako brass
26.5 and 27.5 grains. Quite a full case but electric toothbrush helped it settle enough.
Hopefully shoot in weekend and report back.
Found a place crawling with rabbits in rural Wellington region so hopefully some maximum bunny destruction to follow.
Should be around the 3600fps mark so point and shoot to a fair way out.
Got out to shoot these. Both 10 shot groups.Quote:
Originally Posted by McNotty
First shot of day put me a bit high from point of aim so come down a bit. Fair bit of wind and shooting off trailer behind SXS so not ideal conditions. Shot well enough for me. Pretty sure the outliers are due to the conditions and not the rifle but I’ll have to wait and see when I zero it.
27.0 grains
Attachment 267216
Attachment 267217
27.5 grains (ADI book max)
Attachment 267218
Attachment 267219
Nice. My "Black Beauty" 223 build should be with me this week, it's a 1:7 and will run 69s I hope. I'll be pleased if it goes like yours!
Thanks man. All the best with her.Quote:
Originally Posted by Tentman
First load development using this new method you guys have been talking about. Probably could’ve stopped after a few rounds of the lesser charge when I didn’t get pressure and moved on to the max charge.
Looking forward to some rabbit destruction later on in the week.
Will a 1:9 wist stabilize the 70+ gr projectiles or should I be looking at lighter?
Thanks
My 1:9 stabilises 74 gr Targex and Ive read that they will do the 73eldm. That would be the limit though.Quote:
Originally Posted by imaca
I would verify the twist with a cleaning rod. Some 9 twist were a little short. My Ruger Hawkeye is a genuine 9 twist. My Savage 9 twist are 8 5/8. I can shoot the long 75gr Amax from the Savages with no stabilization issues. Haven’t tried a 75 ELDM yet. My Ruger shoots the Hornady 75gr hpbt and 77 TMK and 75 SBBT with no issues.Quote:
Originally Posted by imaca
It’ll be sure to make them pop I shoot the 55gn at similar speeds and holding high on a rabbit still hits at 250-300yards
I’ll run a 1” high zero. Point and shoot anything from on my knee to 200, and top of back for 250.Quote:
Originally Posted by Kelton
@gimp could you please email me the instructions and spreadsheet? I’m keen to have a play. You and Tentmans posts fascinate me.Quote:
Originally Posted by gimp
I’ll PM email
Sent - post your data !Quote:
Originally Posted by McNotty
