Our original Popped Primers page, that referred to the bolt face treatment, (stoning bolt face flat and countersinking the FP hole) described our best effort at reducing or possibly eliminating incidents of popped primers when shooting the imported Russian Berdan primed ammo. And for some customers, that did the trick. But for others, not always. The issue has been troublesome since the late 80s when we were getting spam cans of “milsurp” ammo, but it seems to be an even worse problem in recent months and years.
But now we can offer our new “Neck & Throat” chamber reaming service that has so far proven to be a 100% cure for this problem. We use a special reamer, mfg’d. for us by Manson, that enlarges the Neck Diameter a thousandth or two and extends the leade, or freebore approximately ¼”. This reduces the spikes in the Peak Chamber Pressure and simply stops Popped Primers from ever happening again, no matter what ammo you use. And it has no effect whatsoever on your ability to use Boxer primed ammo. But if you’re using exclusively Boxer primed ammo, Popped Primers are not a problem for you.
Many Benchresters are likely to scoff at this idea as their train of thought is this would degrade the accuracy of the gun considerably. But considering that Weatherby has calibers with as much as ¾” freebore, that easily shoot 1” groups at 100 Yds, our relatively minor ¼” additional freebore does not have any negative effects on accuracy. Our test guns and many Beta Testers have already proven “no change in accuracy.”
Some may say that removing the chrome from the bore of Russian and Chinese would promote degradation of the bore. But in most of these “milsurp” guns, the chrome has been reduced considerably or possibly been shot out entirely. Simple regular cleaning as you normally would is all it takes to care for it.