How much difference do primers make to accuracy?

[horter]

Thanks Apollo.

I will.

[tom604]

so correct me if im wrong but so far the difference in accuracy is about .1 /.2 moa ? not enough to worry about if hunting and almost not worth it for target shooting unless your being beaten by a poofteenth

[horter]

Not a big deal I guess.

Even though for hunting, gunna try a few different ones for the 30-06.

Annoying that it's just over the 1 MOA mark. If a different primer takes it just under that will be good.

Just for the sake of good numbers

[AusC]

Worth trying.

If it's as much as .2 MOA that could be the difference between a hit and miss at longer ranges.

Might mean not losing a prize

[Davies]

Keeps you busy too. Something to learn.

Give it a go.

[5Tom]

I'll be testing both win LR and CCI 200 in both of my rifles in the next reloading batch with the same charges.

I think had my best groups with CCI primers with 1MOA accuracy out of my mosin, yet the same charge and a WIN LR primer seemed to scatter a little.

In saying that, I think my .243 seems to like the Win LR over CCI 200. Can only test and confirm.

[horter]

Let me know how you go if you could tom.

We can compare with results when I get mine done too.

[5Tom]

Been out to the range today testing my current recipe. I loaded up the following:

10x rounds with CCI 200 primers @ 44.5gr of charge.
10x rounds with WinLR 200 Primers @ 44.5gr.
10x rounds with CCI 200 primers @ 44.8gr.
10x rounds with WinLR 200 primers @ 44.8gr.



I used only AR2209 powder, all cases were fully prepped, flash holes debured, COAL is 2.710 +/- 0.0015, Projecile used was the Nosler 70gr Ballistic Tip. The picture I uploaded here shows a comparison only between two groups, but the other test groups proved to be rather consistent with this picture. Overall, for me, CCI 200 primers produced tighter groups.

*Edit - why aren't any pictures being uploaded

[Apollo]

" *Edit - why aren't any pictures being uploaded "

It's probably too big, try resizing it or upload it to Photobucket or the like then post the IMG Code on a seperate line and it should include the image.

[5Tom]

Here's the pic.
As per above post, The hand loads were made as identical as possible with the primer being the only difference. The rest of the test groupings had similar results. Just to add too, before I fired a test group, I waited for the barrel to cool to try to eliminate barrel temperature.

cci vs win lr.JPG (102.81 KiB) Viewed 6690 times

[Warrigul]

Here's the pic.
As per above post, The hand loads were made as identical as possible with the primer being the only difference. The rest of the test groupings had similar results. Just to add too, before I fired a test group, I waited for the barrel to cool to try to eliminate barrel temperature.

Is this really a fair test? You would need at least three groups of each for an average and to try and rule out the human factor.

Also seems to be more windage variation than elevation.

Just my humble opinion.

[5Tom]

Here are the full targets from yesterday.
All with 44.5gr of 2209

photo 1.JPG (125.75 KiB) Viewed 6681 times

All with 44.8gr 2209

photo 2.JPG (126.02 KiB) Viewed 6681 times

As an average, CCI worked best for that load.

[Apollo]

"5Tom" What distance are these targets at....??

I realise the topic here is primer difference and you show there is a difference but if both your test bullets are 70gr then I think you are using the wrong powder. My thoughts are that AR2209 is too slow for this bullet weight and you are loosing a lot of velocity with this slow powder for the lighter bullets.

You might see a different result with each type of primer, that bullet weight with a faster powder and I think tighter groupings. Then still I would think that different primers would need their own load development as one might perform better with perhaps even 1.0gr less or more powder due to the different ignition factor of the primer.

I'm not going to go into it further here other than to say I have a range of loads to test for my own plus a friend's .243W using 70-80gr bullets and the first pick of powder will be AR2208, then Reloader 15, Winchester 760 and a trial of some Reloader 17 which I don't expect to perform well. All using CCI 200's as they were my pick of a few some time ago.

All I need to do is solve some medical problems so I can get outside and do some shooting before the snow turns up in this part of the country.

[5Tom]

Those were at 100m.

I don't believe that was the best I can get either with the noslers because that load was worked up for Sierra blitzkings. Unfortunately those Sierra projectiles were out of stock and I had to get the next best thing.

Either way, I hope the OP found the answers he's after. I know I have.

[horter]

Yeah, thanks for the photos Tom.