I’ve got a new C.A. In 280ai. The barrel has 75 rounds through it after the C.A. recommended break in procedure. I’ve got a couple different powders loaded up for some ladder tests but am starting to wonder if these will be conclusive. Any opinions on if the performance will change once there are 200 rounds down the tube (for example) compared to now?
Normally by the time you get a barrel broke in, velocities will stop changing due to round count. They will change with different powders and bullet loads. My experience/opinion has been that they can/will increase 50 to 100 ft/sec over the first round up to about 10 to 12 rounds in premium barrels. Factory barrels will often never peak because they will never achieve the finish of the bore in a premium barrel because of all the tool marks left in the bore.
I have seen factory barrel reach 70 or 80 rounds and still not be broke in. So these barrels will slowly increase in velocity but never more that 15 or 20 ft/sec for many rounds.
J E CUSTOM