Re: hornady xtp 124gr 9mm
A long time ago, there was keen discussion about 9mm loads that could make major category (500 ft./lbs+ ME) I took this as a personal challenge, and did it handily with the 124 gr. XTP and a bit much of Blue Dot. I urgently advise that anyone who is serious about the 124 bullets get into Blue Dot. The reason being that Unique will push you right into over pressure with just a tiny bit over the max. load, whereas the case simply can't hold enough Blue Dot to do it with bullets seated to mag length. Find the pressure ratings for both powders, and you'll see that Blue Dot runs both the highest attainable velocities with 124 gr. bullets, AND the lowest pressure for that velocity.
With 115 gr. bullets, the CORRECT powder with those same attributes is Hodgdon HS-6. Unique doesn't even apply (with me) until bullet weight goes to 90 gr. I refuse to use a powder that cannot be safely used with the case clear full. That way, it's impossible for me to make the mistake of overcharging.
Around here, we don't say "Oh shucks", or "oh man". We say Oh BAMA!!