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Ladder Test
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Site Supporter   Location: King County Joined: Thu Oct 16, 2014 Posts: 4012 
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I shot 2 ladders at 300 yards today with my .308. Used Varget powder, 10/1000's off the lands. 175gr Sierra Match Kings.
I'm not sure if I learned anything. Can you help me interpret the results? I had expected more vertical spread. What is the next step? 1 - 42.0gr 2 - 42.3gr 3 - 42.6gr 4 - 42.9gr 5 - 43.2gr 6 - 43.5gr 7 - 43.8gr 8 - 44.1gr 9 - 44.4gr 10 - 44.7gr   I had 3 sighters of the 42.0gr rounds leftover, so I shot a group.  |
| Mon Sep 02, 2019 10:35 am |
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Site Supporter  Location: Spanaway WA Joined: Wed Jul 6, 2011 Posts: 6312 Real Name: Hugo Stiglitz
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I thought this was about Ladder's, like the kind you get on the roof with...
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| Mon Sep 02, 2019 11:20 am |
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Site Supporter  Location: I-5 /512 Joined: Thu Dec 8, 2011 Posts: 15231 Real Name: chris
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zombie66 wrote: I thought this was about Ladder's, like the kind you get on the roof with... I thought with more powder grain your ladder would go up not down...are you shooting with some sort of brace or free hand. kinda all over _________________  |
| Mon Sep 02, 2019 11:26 am |
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Site Supporter Location: King County Joined: Thu Oct 16, 2014 Posts: 4012
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I'm shooting with a machine rest and rear bag.
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| Mon Sep 02, 2019 11:47 am |
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 Site Supporter  Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21268 Real Name: Vick Lagina
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I think I would shoot groups of each load then compare the spreads. You'll probably find at least two loads that have similar performance at the given range.
Then use a chrono to see which of those loads has a more consistent velocity. This will give you a load that will perform well at differing ranges. _________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith "The “A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli Láodòng zhèng zhūwèi zìyóu FJB |
| Mon Sep 02, 2019 12:38 pm |
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Site Supporter Location: King County Joined: Thu Oct 16, 2014 Posts: 4012
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I'm curious how much velocity spread there was between the different loads. I probably need to buy a chrono.
Which one survives being shot the best? |
| Mon Sep 02, 2019 12:50 pm |
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Site Admin   Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 52038 Real Name: Steve
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snozzberries wrote: Which one survives being shot the best? Labradar.  I don't know what to do with your batch of one-shot-per-load pics, but I know that your 3-shot group looks pretty damned good. Go back and do some 5-shot groups, let's see what you get! _________________ Steve Benefactor Life Member, National Rifle Association Life Member, Second Amendment Foundation Patriot & Life Member, Gun Owners of America Life Member, Citizens Committee for the Right to Keep and Bear Arms Legal Action Supporter, Firearms Policy Coalition Member, NAGR/NFGR Please support the organizations that support all of us. Leave it cleaner than you found it. |
| Mon Sep 02, 2019 7:38 pm |
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 Location: Puyallup Joined: Thu Aug 16, 2012 Posts: 9065 Real Name: Richard Fitzwelliner
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I'd be doing atleast 10 shots per diffrent powder load. One shot just tells you yeah that shot landed there.
_________________ If she sits on your face and you can still hear, SHE'S NOT FAT. I'm going to type out 3 paragraphs and wax eloquently about a similar story in my life. Pm me if you figured it out. |
| Mon Sep 02, 2019 8:07 pm |
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Site Supporter Location: Napavine Joined: Sat Feb 11, 2017 Posts: 756
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At a bare minimum, you need 3, one shot group means very little as the environmental variables are many when dealing with long range shooting. I dont think you need to up your charge so small, ie .5 gr increment would be enough to show a sweet spot. And then you can nail down a smaller change to ascertain your findings. My 2 cents.
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| Mon Sep 02, 2019 8:21 pm |
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Site Supporter  Location: RENTON Joined: Fri Mar 25, 2011 Posts: 20771 Real Name: John
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Firing one round of each load is pretty much useless and will tell you nothing.
A 5rd group of each, twice, will tell you all you need to know. 44 grains is the sweet spot for my 5R with Varget and a 175 SMK. _________________ Mr. Q wrote: so basically, if you have to smoke some asshole, make sure they become fertilizer and then Bounce? got it. Guntrader wrote: Huh, maybe I was an asshole. NRA Member/RSO SAF 5 Year Donor GOA Member |
| Mon Sep 02, 2019 9:45 pm |
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Site Moderator   Location: Marysville Joined: Thu Mar 22, 2012 Posts: 13503 Real Name: Mike
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jukk0u wrote: I think I would shoot groups of each load then compare the spreads. You'll probably find at least two loads that have similar performance at the given range. Then use a chrono to see which of those loads has a more consistent velocity. This will give you a load that will perform well at differing ranges. Pretty much this. Except use the chrono while shooting groups. 5 rounds of each should suffice. You’re looking for consistent velocity producing the least vertical spread. Ignore horizontal spread. That’s generally either environmental factors or shooter factors. _________________ Licensed/Bonded/Insured Hardwood Floor Installer/Finisher http://www.hardwoodfloorsnw.com/ |
| Mon Sep 02, 2019 9:51 pm |
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Site Supporter Location: King County Joined: Thu Oct 16, 2014 Posts: 4012
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Sinus211 wrote: jukk0u wrote: I think I would shoot groups of each load then compare the spreads. You'll probably find at least two loads that have similar performance at the given range. Then use a chrono to see which of those loads has a more consistent velocity. This will give you a load that will perform well at differing ranges. Pretty much this. Except use the chrono while shooting groups. 5 rounds of each should suffice. You’re looking for consistent velocity producing the least vertical spread. Ignore horizontal spread. That’s generally either environmental factors or shooter factors. Thanks for the feedback everybody. Would you shoot a ladder then, or groups? I could shoot individual groups and measure the vertical spread based upon aiming point. |
| Wed Sep 04, 2019 6:34 pm |
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Site Supporter Location: RENTON Joined: Fri Mar 25, 2011 Posts: 20771 Real Name: John
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Shoot 5rd groups of each load. If your rifle is zeroed at 100 yards, change nothing. It doesn't matter where they impact from that zero on paper, you are only concerned with group size.
You keep referencing a "Ladder"...are you thinking of a Scope "Ladder test?" _________________ Mr. Q wrote: so basically, if you have to smoke some asshole, make sure they become fertilizer and then Bounce? got it. Guntrader wrote: Huh, maybe I was an asshole. NRA Member/RSO SAF 5 Year Donor GOA Member |
| Wed Sep 04, 2019 6:42 pm |
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Site Supporter / FFL Dealer  Location: Lynnwood Joined: Mon Mar 14, 2011 Posts: 2499
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usrifle wrote: Shoot 5rd groups of each load. If your rifle is zeroed at 100 yards, change nothing. It doesn't matter where they impact from that zero on paper, you are only concerned with group size....... BINGO.... _________________ aka Big_Daddy Nitro Products FFL Dealer SOT Dealer |
| Wed Sep 04, 2019 6:44 pm |
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Site Supporter Location: I-5 /512 Joined: Thu Dec 8, 2011 Posts: 15231 Real Name: chris
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your gr,,, why 3rds? why not increments of .5
go 42. 42.5 43 43.5 or is there something about the 43.8 and 44.1?? sweet spot? _________________ |
| Wed Sep 04, 2019 9:07 pm |
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