Welcome to Chief Okemos Sportsman’s Club!

COSC is a family-friendly gun and archery club in Dimondale, Michigan, located about 15 minutes west of Lansing.


To promote the safe and responsible use of firearms and archery activities in the Mid-Michigan area

C.O.S.C. Pledge

I give my pledge as an American to save and faithfully defend from waste the natural resources of my country, its air, soil, and materials, its forests, waters and wildlife.


For all C.O.S.C members and guests:

You are responsible for your own safety and prevention of the spread of the Covid-19 virus. Therefore, all club and range rules still apply with the temporary additions of:
-Please do not touch anything that you do not have to.
-Please sanitize everything you touch to include wood and metal objects like the range benches and gate lock.
-Please maintain your 6’ social distancing, even with shared household members, or we will be getting calls on it, forcing us to send people out to check on it.

Club Hours:  9:00 am to 1/2 hour before sunset, BUT NOT PAST 9:00 pm, so please pay attention to the time of sunset.

Range Rules:  All members need to be familiar with the Range Rules

In the upkeep of the club, the board of directors has decided to place  a cap of 600 members. We will no longer be accepting new member applications at this time. Also we will no longer be taking walk-ins off the street, you will have to be sponsored by a member in good standing.

  • Non-members use of the COSC facilities is strictly prohibited.
  • Members found using the ranges or facilities in a destructive manner may be subject to revocation of membership.

Club News


Rifles are allowed on all ranges EXCEPT the

  • falling plate racks and
  • 7-yard automated range

Also, there is NO MOVING CLOSER to your targets on the 50, 100 and 200 yard ranges. You MUST stay behind the painted line under the overhead covering!

Thank you,
Ralph Batten, President COSC


With 2022 shooting activities starting soon, please, if weather in looking sketchy, contact the person listed on the club’s contact list to inquire if the activity will still take place. 



  • Time for club members to start renewing their memberships for 2023
  • “Sight In Days” at COSC this year will be held on Saturday and Sunday, October 29th and 30th from 9am until 3pm, and Saturday and Sunday, November 5th and 6th from 9am until 3pm. All participants will need to bring their own ammunition. COSC will provide targets and personnel to assist with this endeavor. The charge is still just $3 per firearm.
  • COSC Antique & Modern Firearm Show – Sunday, Sept 25 9:00 am – 3:00 pm (Flyer)
  • Hey Cowpokes! Cowboy Action is in full swing! See the page to get more details.
  • See the September 2022 newsletter for upcoming club activities. Be advised, activities are subject to cancellation due to weather or public health advisories from the State of Michigan. 
  • Firearms training – See the current newsletter on how to register.
  • New 1-year and 5-year rates for NRA membership!
  • Clubhouse Rental (for Members Only) information can be found on our Clubhouse page.
  • To report lost or found items: cosclostandfound@gmail.com
  • Club By-Laws – If you wish to review the latest revised (Jan 11, 2021) by-laws,
    Bylaws January 11, 2021
  • Is your home address up-to-date with our Membership Committee? If not, please let us know.