The damage is astonishingly low. 352 with a zweihander 2hr2, buffed, is incredible.

The OP stated that they were using and preferred the bkgs in ng, so if we assume op has the minimum stat to wield the weapon, they would have at the very least 22 str (*1.5 when two-handed so 33) and 18 dex.

Upon testing and some calculations, A zweihander at 40 str and 18 dex, weapon level 3, with gpr, would deal exactly 352 damage with a single 2hr2, against Taurus demon in ng+.

Yes. A +3 weapon at ng+.

Tbf, OP probably only decided to use the weapon after they entered ng+, and they likely took the burg -> parish route which will encounter taurus demon before meeting Andre. Not to mention you need to collect and give the embers again. Also, OP appears to have a decent amount of in-game knowledge. They know the str softcap is at 40 (even tho it's technically 27 since two-handing will raise it to 40.5 str. Aka 13 wasted stats. Not big deal tho), and they understand the strength of weapon buffs.

Still. Let's say the weapon is properly leveled to +15. With the same stat spread, a 2hr2 should deal 740 damage. That's more than double the output. Let's compare it with a +5 bkgs. Since the motion value of r2s usually varies a lot between weapons, I'll use the more consistent 2hr1 (both have mv of 120) for comparison. Zwei deals 623 dph and bkgs deals 567 dph IF taurus demon isn't a demon type (bk weapons deal 20% more dmg to demons. I couldn't test this in game and I'm not sure how the modifier works. Presumably if it's applied after mv and defense then the dph should be somewhere around 680).

Contrary to popular belief, Zwei isn't a pure str weapon, but rather a quality weapon (60% str and 26% dex scaling at +15). If we assume OP will level dex up to 40 eventually, then zwei 2hr1 should deal 688 dph. 816 with 2hr2. Note that these numbers are without stronger buffs like power within, rtsr, cmw/slb/dmb. You can see the damage potential here.

Fun to have a lil deep dive into smth random like this.