kitchengunsmith
Member
- Joined
- May 10, 2016
- Messages
- 16
So I was shooting my K31 in the snow the other day, the way God intended, doing some load development, and I encountered something I have never actually seen before: actual significant "cold bore" point of impact changes. I was shooting 3 shot groups(cuz I can't afford 10 shot groups) and with every single group I shot the first shot was way high and the other two would hit about 4 inches lower, within an inch of each other. I wasn't cleaning the rifle between groups or doing anything differently from one group to the next except leaving the rifle in the freezing cold while I swapped out targets. I was increasing my powder charge in increments of .5grains with each 3 shot group; the point of impact would shift accordingly, but each group looked the same with one way high shot and two shots right next to each other.
For those that don't know, the K31 has a little metal chingaderro on the bottom of the fore end of the stock that pushes upward on the barrel. This was done to a lot of old military rifles as a way of harmonically tuning the barrel. The only reason I can figure for my rifle acting this way is that the combination of rapidly changing barrel temps interacting with a wood stock and said chingaderro putting pressure on the barrel caused my rifle to have a completely different harmonic signature cold than it did once the barrel warmed up a little.
I am really curious to hear people's thoughts on what was going on with my gun. I would especially like to hear from anyone who has experimented with full length glass bedding of the barrel.
For those that don't know, the K31 has a little metal chingaderro on the bottom of the fore end of the stock that pushes upward on the barrel. This was done to a lot of old military rifles as a way of harmonically tuning the barrel. The only reason I can figure for my rifle acting this way is that the combination of rapidly changing barrel temps interacting with a wood stock and said chingaderro putting pressure on the barrel caused my rifle to have a completely different harmonic signature cold than it did once the barrel warmed up a little.
I am really curious to hear people's thoughts on what was going on with my gun. I would especially like to hear from anyone who has experimented with full length glass bedding of the barrel.