Sorry, :( I have edited the original post. The correct drop is now listed. That's what I get for working while I'm typing. HA! But I have more now that I've had a minute to do the math. Apparently everyone has an opinion, but I'm the only one willing to put out the facts.
The exact muzzle velocity change I can't determine with my data, but it should be just around 100 fps. Now for the details..
That translates into 23.5 inches difference at 1000 yds. You might say this is significant, but lets compare... The overall drop is now 293.8 inches!! So how much difference is that 23.5 inches? Well the beloved 308 winchester at 1000 yds even at the apparent loved barrel length of 26 inches drops a 200 gr bullet 540 inches....I heard the 338 win mag mentioned...it drops the same 300 gr slug 422 inches at 1000 yds. The lapua is still 128 inches better than a 26 inch barrelled 338 win mag even at 20 inches. Seriously I'm not busting anyone's balls. I can argue ballistics all day, but I want to know if anyone has used a short barrel and how it worked. I'm not a first time gun owner and I think this would make one heck of a rifle.