PB, it's hard to diagnose the problem without the firearm in my hand but I think checking the mag is a good bet. You have the bullet seated within range. You may try seating it to the max overall length (1.275) instead of less and see what happens.
USAF Retired, CATM, SC CWP, NH NR CWP, NRA Life/Endowment/Patron
To preserve liberty, it is essential that the whole body of people always possess arms, and be taught alike, especially when young, how to use them... -- Richard Henry Lee, 1787
"When Government fears the people, it's liberty. When people fear the Government, it's tyranny."
- Benjamin Franklin