Some mcls. added information:
1. a minor correction: CIP 38 Special pressure is <=21,750 psi This is a (European / metric) standard adopted by 1984, IIRC. Do you suppose US mfrs have been manufacturing their export firearms to a different standard than the domestic ones? (/sarcasm off)
2. Speer runs its 38 / 38+P tests to 20,000 or less, they say.
3. Ramshot ballistican says that, given their testing in a 7.5 pressure barrel, a 6" vented (revolver) barrel will drop velocity about 6%, 4" by 15%, and 2" by 23% or so.
4. I've never seen anyone obtain the velocities Vihtavuori claims.
5. The BB 125-gr. load is honest; I've chrono'd it in a 640. (So is the 158-gr "heavy 38+P" load). But I don't know of any retail powders that will do the BB velocities without pressures estimated well above the CIP standard.
6. Ramshot's True Blue may be the 38 Special wonder powder.
MODERATOR EDIT:
A load in excess of published maximum has been redacted. If poster can cite recognized sources in which this was published, the load will be restored to this post.
Johnny Guest
THR Staff
H&R Forum Moderator
is a CIP max load under a 125-gr. bullet, but I haven't chrono'd it yet--maybe tomorrow.
Jim H.