I have 2 of these, the 702 and 715T. Did not realise the 715T is a 702 internally.
Had I known this, I would NOT have bought a second one, I figured with the massive issues I had on the 702 five years ago, Mossberg would have fixed this by now.... I see I am sadly mistaken.
I have had MASSIVE issues with the feeding on this rifle.
Mossberg clearly does not care about whether they build good guns or crap guns.
Both have identical issues, and i'm no gun smith, but even I can see this issue.
There are 2 issues, actually.
The ramp (DIRECTLY UNDER THE CHAMBER) is too short/ needs to be about 5 or 10 mils taller.
No, it is NOT WORN. I have 20 rounds into the 715 and about 200 in the 702.
Look at the chamber, where the bullet will sit when fully ready to fire, there is a gap between the chamber and the feed ramp. Now I understand there should be some space so the rim of the bullet will seat proper, but this space is rediculously excessive. If the rim needs 5 mils, you've got about 30 or 40...
On 1st shot/ manual feeding it will catch on every bullet. EVERY BULLET. It slices 1/8 inch off the side of every single bullet, and bites into the bullet about 1/32 of an inch. Yes, even copper jacket... sometimes it just slices off a strip of copper, but does load, rarely.
Brass jacketed Remington is the only ammo that will work, apparently brass is hard enough.
Seems brass works well enough. I have no bolt issues, etc... you would have a darned good rifle if the design was thought through better.... one extra step in the manufacturing process, and you might actually have a good rifle. It could be a trustworthy rifle, but my 702 and 715T are shaky at best.
I can tell you EXACTLY what is shaving off the copper/ causing jams. The chamber/ hole in the barrel is a perfect 90 degree, the seat of the barrel is the root of this issue, the ramp is contributing.
POSSIBLE SOLUTION:
Take the barrel off the rifle. You see the hole where the bullet sits? Yes, that is the chamber, just in case Mossberg engineers need to know what it's called...
Yeah, bevel/ream it, 2 or 3 mils, 45 degree angle maybe, where the bullet actually sits.... problem is probably solved. On a feed-in, the bullet would not catch on the 'lip' of the chamber, this is exactly where the problem lies, the short ramp contributes.
I'm no engineer, and don't claim to be, but this could be fixed easily.
I don't actually expect Mossberg to fix this, or to fix both of my rifles, but I have been burned by Mossberg. I am sorry to say, they are happy building crap.
This is just my 2 cents.
I will NEVER BUY A MOSSBERG EVER AGAIN. PERIOD.