- May 24, 2021
I know some of you will po po this, but I have never found that the manufacturer of brass made a lot of difference in accuracy. All that brass does is contain the important stuff, primer, powder and bullet. The only difference I have noted between different brands of brass is how many times that they can be reloaded. I do not mix brands of brass, new they are all from the same lot or if once fired from the same box. New brass right out of the box or bag needs to be treated exactly the same as once fired brass. It needs to be dimension checked, full length resized, trimmed to the same length you trim once fired brass to. The powder charge needs to be weighed to the exact weight for each and every round. Bullets need to be checked that they are at the proper dimension and weight and the bullets seated to the exact same depth with the exact same bullet jump from the bullet to the rifling. This is extremely important because different bullet designs have different ogive's which affect how far the bullet will actually travel before engaging the rifling. Hornady makes a tool that makes determining this dimension easy, and it's also inexpensive and accurate. If all is assembled properly your group sizes should not vary and your zero maybe requiring only slight tweaking.Here’s what I’ve got. It’s a Savage 308 win. I used Federal gold medal match for the barrel breakin and then worked up a load in the Federal brass that was shooting 1/4 moa with 168 grain Amax and 46 grains of Varget and a 210M primer. I only had about 40 pieces of Federal brass so after it was getting pretty shot out I grabbed a box of Lapua brass. I knew I’d have to tweak the load some but I expected just a small powder charge adjustment because I have done similar with other rifles In the past. Instead though this rifle just shoots like crap with the Lapua brass. 45.8 grains shoots the best at about 3/4”. So you think the brass needs fire formed first to shoot well? I’ve always had good luck with Lapua right out of the box. What are some of your thoughts??
I have not changed anything g else in the load. I just took the 1/4 moa load and put it in the Lapua brass. Same primer. Same bullet. Same seating depth. And the same charge at first. Then I went up to 46.6 grains and 45.5 grains. 45.8 shot around 3/4 moa and below that opened up and above that opened up. It’s got me a little puzzled.
Here’s a pic of how it was shooting with the Federal brass. I know it says 45.8 grains but 46 (like I said above) proved to be the better load after more testing.