keyholing bullets?
- Thread starter ratherbefishin
- Start date
Too heavy of bullets for the rifling twist is the main one. What are you shooting, and in what?
What Dogleg says.
If this is not the case, check the bore with a good light.
It may look decent, but check the bore just inside the muzzle - the last 1/8th of an inch is the worst for getting rust, then copper, then lead buildup. If this is the case, chopping just a little and recrowning will make it shoot like new.
If this is not the case, check the bore with a good light.
It may look decent, but check the bore just inside the muzzle - the last 1/8th of an inch is the worst for getting rust, then copper, then lead buildup. If this is the case, chopping just a little and recrowning will make it shoot like new.
I've had keyholes from very nice bores under two conditions (note I use cast bullets):
1. The bullet is undersize for the diameter (in my case, the bullet was about .004" undersize for my .461" diameter 45-70 trapdoor).
2. The bullet was too much oversize. I found that bullets that were .003 oversize in a .45-90 I once had would tumble, but bullets that were sized at groove diameter or .001 over shot very accurately.
Note: these were individual cases that may not occur on your guns due to a variety of factors such as bullet weight, diameter-to-length ratio, jacketed vs. cast, etc.
1. The bullet is undersize for the diameter (in my case, the bullet was about .004" undersize for my .461" diameter 45-70 trapdoor).
2. The bullet was too much oversize. I found that bullets that were .003 oversize in a .45-90 I once had would tumble, but bullets that were sized at groove diameter or .001 over shot very accurately.
Note: these were individual cases that may not occur on your guns due to a variety of factors such as bullet weight, diameter-to-length ratio, jacketed vs. cast, etc.
