Post by GSSP on Jul 7, 2024 17:30:25 GMT -5
I'll have some questions to go along with my post.
Several months back I bought a very nice condition Ruger 50th Anniversary NMBH 4-5/8" blue flat top 357 Magnum. Gun is dirty, having just come from the range.
I pin gaged the cylinders and they came out .
Cylinder
1 = .3579"
2 = .3579"
3 = .3577"
4 = .3579"
5 = .3578"
6 = .3579"
Decided to NOT use cylinder #3 during my testing of 5 shot groups.
I did push pure lead Hornady lead balls through the bore, some from the muzzle, 1/2", .3567". Some just into the throat, underneath the frame, .3567". The rest all the way, throat to mz, .3567". All measure with a Mitutoyo .00001" micrometer.
A little shooting of Barnes Bullets ammo to create a base of information to compare to. First, I installed a Griffon Hill reddot optic base for this flattop. I was able to find a no longer in production, Vortx Venom reddot sight for my aging eyes and it was VERY useful. Once sighted in at 25 yds I proceeded to shoot 5-shot groups gather chrono data with the new Garmin Xero C1 Pro chronograph. Really liking this unit. When I tell the unit what the bullet weight is if automatically computes the Kinetic Energy at the muzzle which is important to me since Utah request 500 ft lb KE at the muzzle for antelope and deer. Other, larger, once in a life time Utah big game requires 500 ft llb KE at 100 yds.
125 gr TAC-XPD = 1571 fps, 54 ES, 19.3 SD.
140 gr Vor-Tx = 1336 fps, 79 ES, 29.2 SD I ended up shooting these after a longish session and the groups could be the result of me being tired.
I set the COAL at 1.590" SAAMI
not with the bullet setting up against the cylinder throats at 1.626"
Anyone know of a good holster that will allow this optic to stay mounted "as is"?
Some very nice groups.
I did see an off and on trend where 4 would print into a nice tight cluster, throwing one shot wide. Am I to guess one of the cylinders did not like the bullet? If so, why did it print some very nice 5-shot groups with the same cylinders used throughout the test?
After each 5-shot group I pulled the cylinder and checked the barrel for leading. Some did, but very light leading, some towards mz and some towards throat end, mostly higher velocity/pressure and many did not. I would push/pull a copper wrapped brush through the bore to remove the leading if it existed. It all easily came out. All fired cases either fell out or pushed out quite easily with the push rod. Brass was all 0x fired Starline and primers were all CCI 500 except the H110 loads.
The first outing the trigger and springs were at full/factory setting. 7+ lb pull. It became exhausting. The next session I dropped one trigger return leg spring to reduce the pull to around 4 lbs. Better but not great. A trigger job is in the future.
Your thoughts.
Alan
Several months back I bought a very nice condition Ruger 50th Anniversary NMBH 4-5/8" blue flat top 357 Magnum. Gun is dirty, having just come from the range.
I pin gaged the cylinders and they came out .
Cylinder
1 = .3579"
2 = .3579"
3 = .3577"
4 = .3579"
5 = .3578"
6 = .3579"
Decided to NOT use cylinder #3 during my testing of 5 shot groups.
I did push pure lead Hornady lead balls through the bore, some from the muzzle, 1/2", .3567". Some just into the throat, underneath the frame, .3567". The rest all the way, throat to mz, .3567". All measure with a Mitutoyo .00001" micrometer.
A little shooting of Barnes Bullets ammo to create a base of information to compare to. First, I installed a Griffon Hill reddot optic base for this flattop. I was able to find a no longer in production, Vortx Venom reddot sight for my aging eyes and it was VERY useful. Once sighted in at 25 yds I proceeded to shoot 5-shot groups gather chrono data with the new Garmin Xero C1 Pro chronograph. Really liking this unit. When I tell the unit what the bullet weight is if automatically computes the Kinetic Energy at the muzzle which is important to me since Utah request 500 ft lb KE at the muzzle for antelope and deer. Other, larger, once in a life time Utah big game requires 500 ft llb KE at 100 yds.
125 gr TAC-XPD = 1571 fps, 54 ES, 19.3 SD.
140 gr Vor-Tx = 1336 fps, 79 ES, 29.2 SD I ended up shooting these after a longish session and the groups could be the result of me being tired.
I set the COAL at 1.590" SAAMI
not with the bullet setting up against the cylinder throats at 1.626"
Anyone know of a good holster that will allow this optic to stay mounted "as is"?
Some very nice groups.
I did see an off and on trend where 4 would print into a nice tight cluster, throwing one shot wide. Am I to guess one of the cylinders did not like the bullet? If so, why did it print some very nice 5-shot groups with the same cylinders used throughout the test?
After each 5-shot group I pulled the cylinder and checked the barrel for leading. Some did, but very light leading, some towards mz and some towards throat end, mostly higher velocity/pressure and many did not. I would push/pull a copper wrapped brush through the bore to remove the leading if it existed. It all easily came out. All fired cases either fell out or pushed out quite easily with the push rod. Brass was all 0x fired Starline and primers were all CCI 500 except the H110 loads.
The first outing the trigger and springs were at full/factory setting. 7+ lb pull. It became exhausting. The next session I dropped one trigger return leg spring to reduce the pull to around 4 lbs. Better but not great. A trigger job is in the future.
Your thoughts.
Alan
