Passing some time waiting for it to warm up a bit (zero now -7 an hour or so ago). Some additional info on the M69 that might be of interest.
Picture of barrel shank:
Some measurements M629 Mtn Gun, M69 L Frame 5 shot 44 mag:
629 Mtn Gun weighs 39 oz
M69 L Frame weighs 37 oz
629 Mtn Gun Cylinder Diameter: 1.70”
M69 L Frame Cylinder Diameter: 1.56”
629 Mtn Gun Cylinder Length: 1.705”
M69 L Frame Cylinder Length: 1.670”
(Note: The M69 cylinder is 1.670 inches and isn't recessed for cartridge rims -- a 1.712" hand load fits, but is right at the face of the cylinder. Lymans No 49 edition shows OAL w their 425421 Keith Bullet is 1.710". A .429 minus plug gauge will enter all throats a .430 plug will not.)
629 Mtn Gun Frame Window - Height: 1.735“
M69 L Frame - Frame Window Height: 1.600“
629 Mtn Gun Frame Window – Width: 1.880“
M69 L Frame - Frame Window Width: 1.820“
629 Mtn Gun Cylinder Wall at Narrowest Point: .095” -- (.0900” between chambers)
M69 L Frame Cylinder Wall at Narrowest Point: .060 “ -- ( .130 “ between chambers)
(629 Cyl Bolt Cuts are over the chamber while M69 bolt cuts are between chambers)
629 Mtn Gun Frame Top Strap – Width: .665“
M69 L Frame - Frame Top Strap Width: .665“
629 Mtn Gun Frame Top Strap – Height: .220“ to top of frame (includes sight mortiss)
M69 L Frame - Frame Top Strap Height: .210“ to top of frame (includes sight mortiss)
629 Mtn Gun Barrel Shank OD: .630“
M69 L Frame - Barrel Shank OD: .620“
629 Mtn Gun Frame Over Barrel OD: .900“
M69 L Frame - Frame Over Barrel OD: .880“
629 Mtn Gun Trigger Reach: 3.10“ (same grips for both 629 & M69)
M69 L Frame - Trigger Reach: 3.00 “
Brian Pearce -- Bolt notches weakest point - M69 thicker than M629 at this location
Here are some chrono results:
Chronoed these from the 2.75” M69. Three rounds at 5 Long paces from muzzle and 68 deg F. Larger sample could change the results a bit. Largest ES was 42 fps.
260 WFNGC w/23.0gr H110 avg 1,125 fps
240 Zero JSP with 23.5gr H110 avg 1,126 fps
240gr Fed Factory avg 1,125 fps
265gr CSWCGC (Lyman Thompson) with 17.5gr A2400 (Deep Seat) 1,119 fps avg
325gr WLNGC (BTB) with 22.0gr H110 avg 1,104 fps
For comparison purposes these were shot a while back from my 4 ¼” M69: Same temp, distance from the muzzle.
260 WFNGC w/23.0gr H110 avg 1,224 fps
240 Zero JSP with 23.5gr H110 avg 1,230 fps
240gr Fed Factory avg 1,220 fps
265gr CSWCGC (Lyman Thompson) with 17.5gr A2400 (deep seat) 1,140 fps avg
325gr WLNGC (BTB) with 22.0gr H110 avg 1,182
21.1gr A2400, 250gr Keith 429421, std primer 1,250 fps from 4 1/4” M69
Paul
Picture of barrel shank:
Some measurements M629 Mtn Gun, M69 L Frame 5 shot 44 mag:
629 Mtn Gun weighs 39 oz
M69 L Frame weighs 37 oz
629 Mtn Gun Cylinder Diameter: 1.70”
M69 L Frame Cylinder Diameter: 1.56”
629 Mtn Gun Cylinder Length: 1.705”
M69 L Frame Cylinder Length: 1.670”
(Note: The M69 cylinder is 1.670 inches and isn't recessed for cartridge rims -- a 1.712" hand load fits, but is right at the face of the cylinder. Lymans No 49 edition shows OAL w their 425421 Keith Bullet is 1.710". A .429 minus plug gauge will enter all throats a .430 plug will not.)
629 Mtn Gun Frame Window - Height: 1.735“
M69 L Frame - Frame Window Height: 1.600“
629 Mtn Gun Frame Window – Width: 1.880“
M69 L Frame - Frame Window Width: 1.820“
629 Mtn Gun Cylinder Wall at Narrowest Point: .095” -- (.0900” between chambers)
M69 L Frame Cylinder Wall at Narrowest Point: .060 “ -- ( .130 “ between chambers)
(629 Cyl Bolt Cuts are over the chamber while M69 bolt cuts are between chambers)
629 Mtn Gun Frame Top Strap – Width: .665“
M69 L Frame - Frame Top Strap Width: .665“
629 Mtn Gun Frame Top Strap – Height: .220“ to top of frame (includes sight mortiss)
M69 L Frame - Frame Top Strap Height: .210“ to top of frame (includes sight mortiss)
629 Mtn Gun Barrel Shank OD: .630“
M69 L Frame - Barrel Shank OD: .620“
629 Mtn Gun Frame Over Barrel OD: .900“
M69 L Frame - Frame Over Barrel OD: .880“
629 Mtn Gun Trigger Reach: 3.10“ (same grips for both 629 & M69)
M69 L Frame - Trigger Reach: 3.00 “
Brian Pearce -- Bolt notches weakest point - M69 thicker than M629 at this location
Here are some chrono results:
Chronoed these from the 2.75” M69. Three rounds at 5 Long paces from muzzle and 68 deg F. Larger sample could change the results a bit. Largest ES was 42 fps.
260 WFNGC w/23.0gr H110 avg 1,125 fps
240 Zero JSP with 23.5gr H110 avg 1,126 fps
240gr Fed Factory avg 1,125 fps
265gr CSWCGC (Lyman Thompson) with 17.5gr A2400 (Deep Seat) 1,119 fps avg
325gr WLNGC (BTB) with 22.0gr H110 avg 1,104 fps
For comparison purposes these were shot a while back from my 4 ¼” M69: Same temp, distance from the muzzle.
260 WFNGC w/23.0gr H110 avg 1,224 fps
240 Zero JSP with 23.5gr H110 avg 1,230 fps
240gr Fed Factory avg 1,220 fps
265gr CSWCGC (Lyman Thompson) with 17.5gr A2400 (deep seat) 1,140 fps avg
325gr WLNGC (BTB) with 22.0gr H110 avg 1,182
21.1gr A2400, 250gr Keith 429421, std primer 1,250 fps from 4 1/4” M69
Paul