Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Durkin Tactical Franklin Armory
User Panel

Site Notices
Posted: 1/16/2022 2:32:54 AM EDT
[Last Edit: Normlizer]
Link Posted: 1/16/2022 12:13:43 PM EDT
30 bullets aren't enough to do a proper test.

20.5 to 21.0 grains of IMR-4198 with the bullets seated around 2.200" should function fine. I use the H4198 variety (20.7 grains) with 52/53 grain Sierra Match Kings and they shoot lights out from rifles. Carbine gassed rifles run these 100% reliably. 20" rifle gassed rifles may or may not cycle 100% of the time until they are properly broken in.

IMR-3031 could use between 23.0 to 23.5 grains and shoot (function) reliably. I have used 22.5 grains with Hornady 60 hp flat base bullets and it's close to maximum with that bullet weight.

Reference online data (Hodgdon) to gain more insight.

Link Posted: 1/16/2022 4:23:01 PM EDT
[Last Edit: Normlizer] [#2]
Link Posted: 1/17/2022 2:07:49 AM EDT
[Last Edit: Normlizer] [#3]
Close Join Our Mail List to Stay Up To Date! Win a FREE Membership!

Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!

You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.

By signing up you agree to our User Agreement. *Must have a registered ARFCOM account to win.
Top Top