Does the SST create more pressure with the same loads as the BT?

The jacket on the BT is slightly heavier than the SST...this might suggest a trifle more resistance to going down the tube but to say it's more pressure is not a verifiable statement.....this much I can say.....I've used both bullets with the same loads with no discernable differences.

I can second the 'no discernable difference' comment in the .308 caliber ones I have tried. Virtually same POI and velocity on the same powder. The Bt is slightly more streamlined, and has a brass (gilding metal actually) jacket...the SST is pure copper IIRC.

BT's were measureable more accurate for me though...and slightly more effective on deer (sample of 3 for SST vs 50+ for BT's). YMMV.

CDH, you likely thinking of Swifts,not Hornady when you mentioned copper jackets.

I tested 308 165s SSTs and BTs into wet phonebooks.The SSTs were ever so slightly better.But this test only counts with those bullets.

The 139 gn 7mm SST seems to produce a little less pressure than the 140gn Nosler BT . SST's also shoot groups about 3 times as large as BT's in my 7mm WSM .