Touchy 760 chambering

[clodbuster]

Took my 760 to the range and with hand loads it seems to take more effort than I expected to chamber, but shooting went well enough.  Is this a sign that I might need to use small base dies?  If not what are those symptoms/signs?   The overall length is well under listed but in checking the jump the bullet has to make into the rifling, it was pretty tight,  do this model tend to have a short leade?  Thanks guys

[Siskiyou]

Both my brother and I had M760's in .270 Win.  My reloads would not chamber in his rifle.  I trim to the recommend trim length but I have found that necked down 30-06 brass works great.  Pressure signs go up as the cases get longer.

[Dave in WV]

My son's 760 30-06 has a good bit of free bore. We can seat the bullets out a ways with it. He uses small base dies. I never did but I noticed I had to run the cartridges through the chamber one time before using them for hunting. They would chamber fine but it took some pressure to get them to extract if unfired. I'd check the case length first and then consider bullet seating depth. You may need small base dies. I do know a fellow that didn't tumble his brass when he started reloading. He had one 760 that wouldn't chamber his reloads. He tried small base dies to no avail. He got a tumbler and they chambered fine. One other thing to try is to clean the chamber good. Dave

[Rick Teal]

My 1954 760 in .35 Remington presents a similar problem.  I make my own bullets that are pointed, but have a rather sharp (4 calibre) ogive.  I  found that seating them deeper solved the problem for me.  However, I'm just a hunter, and have never been concerned with MOA accuracy in my guns.

[while99]

I have a small-base sizer die for the .30/06.  When loading for one of my 760 pumps in .300 Savage I often remove the de-capper stem from that die and run the .300 Savage cases through it before proceeding with my normal reloading routine.  This works great.  
You could also get a 7/8 x 14 socket-head cap screw and have a machine shop bore a hole through it that measures roughly .467" and run your cases though it before reloading them.

[Cougarz]

Model 760's have rather large chamber dimensions to improve feeding and chambering.  The pump action does not have the leverage to push rounds home like a bolt action.  Nor does it have the extraction power of a bolt action.  So the chamber has to be a little big to make it work smoothly.   Because of this full length resizing of the case is required. The brass won't last as long because of the expanding during firing then squeezing down during resizing but they last long enough. :-)

[vinconco]

I just bought a used 760 30-06.   I use the lee Collet neck sizer in station 1 and a Redding body die in station 2.  I adjust the body die down until the case will chamber easily then lock it down.  Anytime the shoulder is set back the case grows in length and not always uniformly from case to case.   Always trim all the cases after setting the shoulder back so that you get the ONE case that is too long.  


Siskiyou;
    If pressure signs are going up as your cases get longer...... TRIM THEM FAST!!!   :shock:  They are already too long.   Most loading manuals list the Max length.  If it doesn't say "Trim To Length"  then take .010 off the max length

[Bretzky308]

Ditto that full-length resizing advise.