Buffalo Bore specializes in trying to get more bullet energy out of loads with low peak pressures. Tim is using pressure test gear to work out loads that keep a steady pressure going longer rather than a short sharp spike in pressure.
It's quite possible to have two loads that deliver the same bullet energy, but one is doing double the peak pressure and is destructive to the gun. The other is doing half the pressure but holding it longer.
It's notably easier to pull off this trick with heavy hardcast loads as opposed to lighter JHPs. The hardcast with more weight (as high as 270gr in 45LC compatible with a post-WW2 Colt SAA, NewVaq, etc.) is moving slower at the first instants of burn, letting a slower-burn powder "catch fire". A lighter slug might be out and too far down the barrel before slow-burn powder can really wake up. So you end up needing faster-burn powder, which does a shorter, sharper pressure curve.
Anyways. Buffalo Bore says *their* version of the 200gr JHP doing 1,100fps is compatible with a NewVaq or even weaker solid-frame Uberti/Pietta/etc. And Buffalo Bore doesn't have a rep for blowing up guns, as long as you use their stuff in guns they say can cope.
Here's an example: BuffBore right now ships a 158gr 38+P all-lead hollowpoint rated at 1,000fps from a snubby. And it's really delivering that without blowing guns up or leading much (it's a gas-check). Cor-Bon used to sell a load exactly like it except no gas check - and it was leading up something brutal and otherwise had a bad reputation - it's long since discontinued. Cor-Bon has also backed off the pressure levels of their 125gr and 110gr 38+P loads of late - again, signs of over-pressure in some guns.
Cor-Bon doesn't have as good a rep for careful loading as Tim Sundles at BuffBore has now. I suspect Tim might be able to make a 200gr JHP @ 1,100ish work in a NewVaq where Cor-Bon can't.
