What is the differance between the Hornady 270 grain 375 bullets? I have 4 older boxes #3710 270 grain Interlock spire point and 2 newer boxes #3711 270 grain interlock SPRP? How are they not the same??

Well I show the 3710 as an "SP" the 3711 as an "SPRP". As to what the difference between the two is I have no clue. I would treat them as the same and go shooting.

I had some of both and they look the same so I loaded them the same.

The newer "Interlock" bullet has the core "locked" into the cup with a couple of bands of copper in the shank. I don't believe the core is actually "bonded" to the jacket though.

Visually the new bullet's point is more of a protected point, with a small flat exposed lead tip, and the original soft point was a pronounced exposed lead tip.

If memory serves, the ogive point on the bullet is also different, and I know at least in my loads the over all length changed a bit.

Comparing the new to the old, the accuracy is still excellent though, at least in my 2 guns. I haven't had the opportunity to test the new bullets on game yet (sadly-no elk tags), so I can't say if game performance is any different.

quote:

Visually the new bullet's point is more of a protected point, with a small flat exposed lead tip, and the original soft point was a pronounced exposed lead tip.

In Hornady speak, RP means Recoil Protected.

LWD