Montana Rules of Civil Procedure R. 86
Rule 86. Effective Date — Statutes Superseded.
(a)In General. These rules and any amendments take effect at the time specified by the supreme court. They govern:
(1)proceedings in an action commenced after their effective date; and
(2)proceedings after that date in an action then pending unless:
(A)the supreme court specifies otherwise; or
(B)the court determines that applying them in a particular action would be unfeasible or work an injustice.
(b)October 1, 2011 Amendments. If any provision in Rules 1-86 conflicts with another law, priority in time for the purpose of section 3-2-706 is not affected by the amendments taking effect on October 1, 2011.