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Pick a primer

 
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  #1  
Old 01-14-2006, 09:12 PM
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Pick a primer

Been attempting to get the Standard Deviation of my loads down a bit. I usually just keep track of max spread but seeing as how most of the folks here talk in SD.... When in Rome.....

Usint RL-22, velocity is good, groups at 200 yds are way small but my full sized steel coyote is safe about 50% of the time at 735 due to shooting high, then low, then starting to chase the last shot which results in way more misses at [img]/ubbthreads/images/graemlins/frown.gif[/img]

Experimenting with Ramshot Magnum. Heard rumor that Large Rifle primers worked better than Magnum primers. Tho't I'd give it a go.

While striving for statistical significance [img]/ubbthreads/images/graemlins/crazy.gif[/img] I know this isn't many shots but here's the results.

What would you recommend my next step to be?

All things were constant except for the primers. Fed-215s and CCI-200s.

Target "A" 84gr Ramshot Magnum
CCI 200 primers
Sierra 250 game kings.

Target "B" 84gr Ramshot Magnum
FEd 215 primers
Sierra 250 game kings


Number crunching:
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Old 01-14-2006, 10:23 PM
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Re: Pick a primer

Two questions.

How long did you wait between shots?

Was the top target fired first?

My impression is that the barrel is walking vertically about 0.25 MOA per shot. There is only a 8.3% probability that bullets would line up like that twice by random effect and if the top target was fired first then there is there is less than 1% chance of six bullets lining up 1,2,3,4,5,and 6 by random luck. Perhaps I should go and get out my probablity theory book but I think it is 6 factorial.
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Old 01-14-2006, 11:22 PM
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Re: Pick a primer

Don't you ever sleep.

Bye the way, keep your good eye out for jimm. He's awaitin' for ya around the next post. [img]/ubbthreads/images/graemlins/grin.gif[/img]

I fired 1 shot at each target in succession. Shot 1 @ target 1, then shot 2 to target 2 and around and around till I ran out of loads.

Outside temp was 50 degress, hellofa deal for late Jan. Very slight wind.

Waited several minutes between each shots.
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Old 01-15-2006, 12:38 AM
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Re: Pick a primer

Roy, Yes, according to RamShot they recommend std primers for their powders. Although your sample is small, the std primer had a better SD than the mag. I'd try a Fed 210 or 210M primer and Win LR to see what gives best SD and groups. Personally, I usually find Fed 210M give better results than CCI. Then, do the usual seating games to find sweet spot. What has been the group size for this barrel? Good luck!
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Old 01-15-2006, 12:56 AM
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Re: Pick a primer

I have been using CCI BR-2 lately. They have been giving me good groups and low SD's. I used to use mainly Fed 210's. I have tried the same loads just different primers and gotten mixed results. Some just like 1 primer better then the other for a given load. I guess you just gotta keep experimenting to find that "perfect load."
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Old 01-15-2006, 08:04 AM
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Re: Pick a primer

Jimm is just happier than a pig in slop now you have given him the little roll a round on the floor guy. You should get him to send you a picture of his truck.

[ QUOTE ]
fired 1 shot at each target in succession. Shot 1 @ target 1, then shot 2 to target 2 and around and around till I ran out of loads.



[/ QUOTE ]

Same issue with barrel. Almost no chance that the vertical stringing is random. What I have to do to get tight groups is wait almost 10 minutes between shots. At temeratures under 50 degrees you can probably get by with 5 minutes if you have a factory barrel (heavy barrel heats up slow but then stores it for a long time). If you are planning on using this gun for long range shooting at animals then the critical thing is to take at least an hour to shoot you base zero group of five rounds. This will ensure that the 0.25 MOA walking error is not transmitted down range.

I pretty much know that with my gun I get two shots to same point of impact and then things start going high and right in a hurry unless I let the barrel go back to stone cold.

Those are really nice groups nonetheless given the size of the projectile.
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Old 01-15-2006, 08:36 AM
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Re: Pick a primer

[ QUOTE ]
What has been the group size for this barrel? Good luck!

[/ QUOTE ]

W/RL-22 and both Sierra 250 GK and WC 252s 3 shot groups of around 1/4 MOA @ 200 are achievable. They open to right around 1 MOA with SMKs.

Buffalobob:

When tuning the RL-22 load. I reached a powder weight that resulted in quite defined Vertical stringing. I then jumped the powder at least a grain, maybe more and got Horizonal stringing. Dropped back about half of the amount I jumped and got 3, 3-shot 1/2" groups @ 200 in succession. (Well spaced 3 shot group, loaded 3 more and shot them, then reload the last 3 and shot them.) Reloading room is 100yds from the shooting bench.

I guess I just like experimenting [img]/ubbthreads/images/graemlins/confused.gif[/img]

Your point's well taken on the barrel warming. I keep forgeting that its a remington barrel.
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