The Firing Line Forums - View Single Post - How can I get my 308 reloads to be as good as out of the box168gr Fed GMM

Jimro · June 12, 2014, 12:56 AM

Ok, if you want to duplicate Fed GMM...

Buy Sierra 168gr SMK bullets.
Buy virgin Federal Premium brass.
Buy Federal GMM large rifle primers.
Buy a jug of IMR4064.

Assemble the rounds, do a ladder charge, five rounds each with the following charges.

41.5
42.0
42.5
43.0
43.5

Five rounds each.

Find the two groups that impact closest to your FedGMM lot.

Then fine tune the powder charge until the POI is the same between your handloads and the commercial lot.

Don't expect the same performance after the brass has been shot once.

Jimro

June 12, 2014, 12:56 AM	#6
Jimro Senior Member Join Date: October 18, 2006 Posts: 7,097	Ok, if you want to duplicate Fed GMM... Buy Sierra 168gr SMK bullets. Buy virgin Federal Premium brass. Buy Federal GMM large rifle primers. Buy a jug of IMR4064. Assemble the rounds, do a ladder charge, five rounds each with the following charges. 41.5 42.0 42.5 43.0 43.5 Five rounds each. Find the two groups that impact closest to your FedGMM lot. Then fine tune the powder charge until the POI is the same between your handloads and the commercial lot. Don't expect the same performance after the brass has been shot once. Jimro __________________ Machine guns are awesome until you have to carry one.