Changing out breech plug or o-rings

[Hammer49]

How often would you suggest switching out the breech plug itself vs. the o-rings (I'm shooting an encore PH)? And, along those lines, how often would you suggest switching out the o-rings? I'm about to place an order with MidSouth and don't want to "short" the order. Thanks in advance!

Hammer

[lemoyne]

With normal use about 20 pounds of powder for the breach plug, I change the O ring once a year. Lee