Originally Posted by marioq
So I also tried 250 Bergers today but stopped when I got the bad velocity. I have some 250 sierras too so I can try that. As for mag length, I think u mean max length???
So you are talking about my OAL with the hornady OAL gauge and take .030 off that number?
Just making sure I don't waste more time and powder!!!!
Actually sometimes more free bore is better. If your chamber is a SAAMI spec. the cartridge OAL
is not measured at the ogive but the tip of the bullet to the case head. Different bullets measured at the ogive will have different COAL lengths.
Most manufacturers control the COAL and the free bore with the magazine/Mag well length.
If you shorten the COAL to Magazine length minus .020 to .030 that will increase free bore and should increase velocity if your chrony is working right.
Hope this helps
J E CUSTOM