The comment about BB not caring about SAAMI specs deserves rebuttal.
They do the R&D for those who can't be bothered to do their own.
They have the lab that you don't want to buy yourself.
They are VERY cognizant of pressures.
They are very much concerned about safety among those who buy their products (both from a "We don't want to hurt anybody" viewpoint, and a "We don't want to get sued" angle).
Their stuff is consistently excellent quality.
Their stuff is expensive BECAUSE they did the R&D and they expand the envelope in bullet & load choices you generally won't find elsewhere.
They make no pretense of going after the mass market.
They produce products for those who want more performance in certain areas than the major makers will provide, for those who don't want to get into building their own, and for those who may only buy a box or two to last through several years.
As far as pressures go, they can run high.
The company does watch those in load development & does not sell bombs.
It sells high-performance ammunition.
The consumer has the responsibility of determining whether a high-performance load is appropriate in their particular gun or not.
Last September I ran some BB 158 LSWC gas-checked +P loads through a Smith 10 and a Colt OP, along with three other factory loads.
I did not chronograph through either gun.
Both guns were in excellent condition, the Colt was unfired from the early 60s & the Smith was lightly used from the 70s.
The BB produced a best-group at 25 yards through the Smith of five holes at 1 5/16 inch.
The BB wasn't the best performer among the four factory loads in the Colt, but did its tightest group at 2 3/8 inches.
The BB stood both guns up in my hands, literally.
Hot stuff.
Far more noticeable recoil than the next stiff load, a Black Hills 125 JHP +P.
If I were to carry a full-sized .38 again for defensive use, I'd go with a BB load without hesitation.
I'd do my own handloads at the upper levels of the manuals' charge ranges to come closer to the BB in recoil for realistic practice, but I'd actually carry the BB.
The only real factor I'd have any concerns about would be the broad axim that hotter loads GENERALLY run the risk of accelerated wear in a DA revolver, and for that reason alone I would not consider an older Colt V-Spring gun to be a viable candidate for such applications.
The basic action of an OP can stand up to hotter .38s, the 357 V-Springs did well with hotter magnums when those were introduced.
Both have the same internal vulnerability in the hand, though, and Colt can't service those anymore.
If I were going to shoot the OP here much, it'd be more mild ammo to prolong the life of the hand, and it'd be only occasionally, same reason.
And- SAAMI is not the final word on pressures, anyway.
Denis