Hello.
I am trying to determine a maximum do-not-exceed velocity for a cast & coated 158gr bullet in my 4" 586. Note that I am well aware that a certain velocity doesn't necessarily mean a safe pressure... Surfing YouTube, I find values between 1250 and 1434fps (for Underwood & Buffalo Bore), the later seemingly very high for a barrel that short. I wonder what kind of powder they use...
Just for information, I have only access to French powders and Vihtavuori:
Vectan Ba9: Very close to Unique (not used for heavy loads).
Vectan SP3: Very close to 2400.
Vectan Ba6-1/2: Very close to N110/H110.
My test loads (not shot yet) do not exceed 15.5gr of both SP3 and Ba6-1/2, slightly below Vectan's max published data.
My light load is 5.5gr of Ba9, and my medium load is 13.5gr of SP3. I use Starline 357 cases with regular primers.
For those of you guys who own a chrono, what kind of max velocity did you settle on with your 4-inch barrel?
Thank you.
Gil.
I am trying to determine a maximum do-not-exceed velocity for a cast & coated 158gr bullet in my 4" 586. Note that I am well aware that a certain velocity doesn't necessarily mean a safe pressure... Surfing YouTube, I find values between 1250 and 1434fps (for Underwood & Buffalo Bore), the later seemingly very high for a barrel that short. I wonder what kind of powder they use...
Just for information, I have only access to French powders and Vihtavuori:
Vectan Ba9: Very close to Unique (not used for heavy loads).
Vectan SP3: Very close to 2400.
Vectan Ba6-1/2: Very close to N110/H110.
My test loads (not shot yet) do not exceed 15.5gr of both SP3 and Ba6-1/2, slightly below Vectan's max published data.
My light load is 5.5gr of Ba9, and my medium load is 13.5gr of SP3. I use Starline 357 cases with regular primers.
For those of you guys who own a chrono, what kind of max velocity did you settle on with your 4-inch barrel?
Thank you.
Gil.