In the next week or two Im going to go out and shoot 3 different brass selections for my 6.5 creedmoor. The brass is from remington, hornady, and seller and bellot. Im looking to see how mixed brass effects velocity an group size. If anyone has any opinions or experience let me know.
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This message is going to be a recorded learning lesson. When using my chronograph it was used between 1-3ft from my muzzle. This gave very bad, and inaccurate readings. Waste of ammo and time. After a quick google, I learned that 15-20ft is appropriate, so that muzzle blast does not interfere. This may be old news for most, but something I had to catch up on.
I would be very careful. If you say load up a good load in say hornady brass, you better back off in S&B brass as it is thicker thus less case capacity. I've seen primers blow right out of S&B brass from box. So please reduce your loads to min book load. You might find changing seat depths to be much more effective in that test as it will change your velocities as well.
Have you checked each brands capacity ? Every case can be different but most likely brand to brand will show the most. My RP cases will hold more than Hornady in some calibers. Water is fine but I use powder to the top, (to check, not shoot! )The brand that has less capacity will run higher pressure and more FPS generally.
Please keep us updated with your results! Very interested to see how things hold up. Is this once fired brass? @matt.fulkerson99
The biggest factor will be consistency from one piece of brass to the other. You don’t have to do this, but you may want to fill each case up with water to checkout the weight in each one. Brass thickness can vary from one piece to the other.