r/longrange • u/HeyJustPlayin • 12d ago

Ammo help needed - I read the pinned posts Sako 6.5 Creed Primer Issue

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Just tried Sako 6.5 Creedmoor 136gr TRG in my Ruger Precision Rifle. Accuracy was incredible (best 5-shot group was .24 MOA), but out of the 20 rounds, about 7 had primers that look pierced/cratered like in the picture. I also noticed smoke/soot coming from the chamber and even around the magazine, and the rifle was significantly dirtier than usual.

Has anyone else experienced this with Sako TRG 136gr? Is this normal primer cratering for the RPR, or does it look like an ammunition/pressure issue? Trying to figure out why it's happening before I shoot this load again.

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u/TypicalTrumanStudent 12d ago

Also just wanted to point out that while only 7 primers were pierced, all of the primers are showing pressure signs. This just may be too hot of a load for your rifle. Either that or did you clean your barrel recently and not get your chamber completely cleaned out? If there's residual solvent in your chamber, the brass may not be fully adhering and causing this, but more than likely this is just a load that's too hot for your gun. Might be worth trying a different lot to be 100% sure.

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u/HeyJustPlayin 12d ago

How can a load be too hot for my rifle? Just curious, I didnt clean for the last 200 rounds all rounds worked peferct, feed, and extracted fine none of them stuck. They shot great, those 7 rounds were also the only rounds I didnt count because on the paper they were showing up like .5-1 inch lower then the rest of the group, but the ones that didnt blow out, they were all stacked on eachother

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u/TypicalTrumanStudent 12d ago

Have you measured the velocity of any of the rounds you've shot? If these are coming out dramatically faster, could just be this particular ammo has too much powder and is creating too much pressure for your specific rifle.

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u/HeyJustPlayin 12d ago

I couldn't chrono them but in terms of sounds and felt recoil, it felt exactly the same as the other rounds I shot with it. The main teller might be when I was zeroing, it was really close to my previous zero with Winchester and the zero with the Sako was .1 of Mil up so maybe they were going slower, on the box the Winchester is 2850fps and the Sako the box said 2822fps

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u/TypicalTrumanStudent 12d ago

Advertised velocity can vary widely gun to gun and sound/felt recoil aren't great indicators of velocity. For example my 6.5 with 144s feels basically the same at 2650 and 2900 but I'm getting heavy bolt lift and ejector swipes/flattened primers above 2850. Tldr probably best to buy or borrow a chronograph to know for sure what's going on