I like my (.444 Marlin) XLR primarily because it is
stainless, has a
floated magazine tube, and is
VERY accurate (I did have to fiddle with a forend wood splintering issue though

). Even if the ballistics of the XLR rounds weren't as advertised (
and for the .444 they appear to be - 2050 fps and 3052 fpe - I chrono'd three at 2042, 2047, & 2048), I'd like the GUN.
My gripe is that the brass is shorter, and since I didn't really care about 300 yard trajectory as much as 200 yard accuracy, I figured I'd be reloading ordinary bullets, so I will save the box of 'short' Hornady brass for if I load shot capsules or something weird.
As printed on my box of .444 Marlins, they claim +3" at 100 yards gives -1.4" at 200 and -18" at 300, and I didn't get to test that far due to only having 100 yards at the range, but if the muzzle velocity is that close, it should be close trajectory-wise. I don't know what the .45-70 claim for trajectory was, but I'll bet that even at the slower velocity than you'd hoped, the final drop at 300 yards won't be much different than the .444, due to the heavier bullet probably retaining more velocity at 300 yards than the .444's, which has slowed to 1380 fps at that point. The .444's 300-yard energy is supposedly 1120 fpe with their little 265 grainer, so most likely your .45-70 will have at least that much energy remaining at 300 yards, as well...
On a positive note, even the 'lesser-than-originally-claimed' .45-70 load they're selling is a thumper, and I'll bet you can nail any critter you need to with it.
