Strange happening!!

wynn24

In my ruger .22-250 i have been loading 33gr of winchester 748 with a cci magnum primer and a sierra 52 grain hollow point. I shot a group of 5 and then zeroed in. I also shot a varmit or two in between. And then another grouping the other night. Basically i have shot this load 16-18 times. Everything was fine, groups great, no signs of pressure, ect. Last night i shot same load and the case ejected very black, the neck was covered and a majority of the case. Wasnt sure of the problem so i fired another round. Same thing very black. The residue wipes right off but i haven't seen anything like this before. Any thoughts on what this could be. I have shot this load several times and no problem. I realize that the 33gr is near the bottom of loads recommended, and powder usually burns dirty at the low end, but i am using the magnum primer. Any input would be greatly aapreciated. Thanks Ryan

perry shooter

Hello IMHO your load is not generating pressure to expand the case to the chamber walls and you are getting blow by my suggestion is to use a faster burning powder to load if you want reduced velocity loads.

Highball

Has the weather moderated since the 'blackening cases' started ?

JustC

pressure too low. More powder or faster burning powder.

mrbruce

Step it up and loose the Mag primer it's not really needed with that little bit of powder unless it's a hummer as far as groups go.....