As a matter of fact we have run into problems. It has hurt us. Have been very reluctant to call out any names. It is safer to name the barrels that we know work well with our bullets. The list is pretty long. Here goes: Bartlein, K&P, Benchmark, Pack Nor, Preferred, Lilja, McGowan, Douglas, Savage, Proof, Remington on their 1960s production rifles. Have not tried Hart or Shilen. Some of our customers may have used other brands that have worked well for them but have not told us, not that we necessarily needed to know. Very kind of Chase to mention us. He is a real stand up guy and very very honest. Superb teacher of the art of ELR shooting, I should add.