The winchester 222/333/555 bulk hp is very effective on gophers, its all i use. The winchester xpert hp was even more accurate, but fouled my barrel within a few hundred shots. So i gave up on it. Federal bulk hp are not effective for me on gophers due to the small hp, too many crawl aways.
However, to shoot gophers past 50 yards, i want my .22 to put 5 shots in less than an inch, so i much prefer to test ammo before investing in a pile of it. Because it gets frustrating. JMHO.
Something i never expected though is that now, as 333 ammo is all my 10/22 has seen for years, its accuracy has noticeably improved with it. It's probably pretty close to 1/2 " at 50 yards. I never clean the barrel.