I am very fond of the older Mossberg rimfires, particularly the "M" models.
They are a very good quality firearm, and tend to be very accurate.
I have a 151 M, a 46 M and a 42 M, plus a 146 B and a 144 LSB [Very accurate]
My 146 B is a T bolt, but they were also made with a round bolt handle.
I had an interesting encounter at the local club range when I was shooting my
146 B. A fellow came to shoot at the rimfire range. He did not waste any time
telling me how he had spent over $1000.00 on his fancy 10-22 Ruger,
and how it was capable of shooting better than any bolt gun [especially an old
Mossberg like I was shooting]
I take that stuff with a grain of salt, but let him know that the "Old Mossberg"
was a pretty decent shooter. He challenged, I accepted. We agreed on 10 shots
for score at 50 meters. His score: 94/100, the "Old Mossberg": 96/100. He was
somewhat subdued for the rest of the time there.
FWIW, the Mossberg likes Lapua Master L, but I am getting low. Dave.