Thread: Reloading Poser

Do a measurement to where the projectile contacts the rifling to see how far advanved your throat has gone.
If you don't have a dummy case etc you can do a rough check using a cleaning rod.
Close the bolt and push cleaing rod hard up against bolt face. Mark the point on your cleaning rod at the muzzle.
Remove bolt and drop a projectile into the chamber. Give it a gentle tap or push with your cleaning rod to ensure its in conact with the rifling.
Push cleaning rod carefully down the barrel again taking care to not dislodge the projectile. Make sure you have a jag on the cleaning rod for both measurements. If you don't and your rod has a female end the end will go over the tip of the projectile and give a reading error.
Mark cleaning rod again at the muzzle.
Measure between the 2 marks and compare that with a loaded round.

My first 22-250 had grouping issues after many many rounds. It would fire a goodish group followed by a shotgun group. Never consistant. I didn't have a bore scope back then so did the simple measurement with the cleaning rod and was horrified that the projectile contact with the rifling, due to throat errosion, had moved a good distance up the barrel. Also, when I pushed the projectile with the cleaning rod I could feel roughness.