Reloading to tune a load to a barrel is probably one of the best ways to gain that extra accuracy. But some standard rifle barrel contours are beyond finicky in harmonics.
I would love to explain a list of barrel harmonics and how I fix them but I'd hate to be discredited by all the experts in the gun world. But rubber is a very cool way to fix harmonics vs. stock issues. Also plastic and brass but harder to test and keep in one spot without glue or adhesive. Still waiting on the heat of the summer to run a final test. If it don't change impact then I'll never waste money on having a gunsmith bed in a standard sporting contour barrel again. EVER. But alas waiting on the heat of summer is a long way off and I'm sure once again I'll be proven wrong. Time will tell.