I started fooling with my 25-06 today with 100 gr SMK bullet's and setting FL dies to partical re-size with a feeler guage. The idea being to make the setting up of FL dies for that operation much less complicated. I only recommend partical re-sizing on belted and rimmed cases to make those cases head space on the shoulder rather than the belt or the rim.
Well I tried with my .243 and found out that to partical re-size with it, the die needs to be .001" off the shell holder. That don't show much! So I decided to try with my 25-06 and got bullet's to do it with yesterday, 100gr SMK's.
Got out a box of MTY but primed FL cases and made four try loads up to max listed for IMR 4350. Those cases will get partical resized and soon as they won't chamber after being fired anymore, go to the feeler guage to set the die.
Went to the gravel pit where I do a lot of 100yd shooting and set up. Shot at 100yds from a bench and off a sand bag rest. Got to the fourth group, listed max load, and pulled the first shot, knew it when I did it. 1st shot was 3/4" low and 3/4" right of the second shot. Went back and fired another, then walked down to look while the barrel colled. Missed the target completely! Couldn't possibly be but there it was. Went back and fired one more and walked down again. 4th shot opened the 2nd shot just barely and I mean barely. Huh! Fired the 5th shot and could see the hole moved just a smidge.
Got home and looked at the back of the target and could see the paper torn a bit more than one hole would do. So got the calipers out and measured the widest point best I could eyeballing. .368"! That's more than one hole. Take away one dia, .257, and that leaves a group size c to c of .111". Nothing special, do it all the time! Yea right. I'll take a picture of this this and post it tomorrow, I still have a hard time believeing this and the target is right here.
BTW, I'm still gonna try the experimant with this rifle. Then I'll probably get back to this load!