new to reloading world my primers are cratering but my grups are good in my 308

[ducksdime]

can anyone help me i have a rem 700 vtr 308 1 12 twist and i am loading a nos 125 bt blis tip with win 748 51.5 grn and my primers are cratering and flating out but my grops are good at 100 1/2 to 1" i now thats not great but its good for me im trying to lear myself and allso my grops are horable out at 300 yrd any help is grantly aprechated i willing to change my bullet and powder alltogether im trying to find a good allround bullet for varmits to deer to bench thankyou very much

 

[scout1]

duck, your at the very top with that load according to Quick Load. Drop back to 48.7 grns and shoot a round robin going up in .3 grn increments at 200 yards. You should find something acceptable.

Good luck, Jon

 

[whiskey08]

Id try a sierra 155gr mk, with varget, imr 4064, or imr4895. In that order. Im running 47grs of varget right now with a 155. make sure you work your way up to 47 if thats the route you wanna try. 47 gr's is flattening my primer, cratering i think is a function of sloppy firing pin hole? Ive had good accuracy with ballistic tips but I was shooting 150gr bullets.

also, something to try is try loading with bullets touching or .002 off of the lands then back off from there a little at a time. I always found that to affect accuracy the most, assuming i was doing everything else okay.

good luck

 

[Rust]

That, my friend is a pretty hot load. The old Winchester data says that 52 gr of 748 is maximum and that is still using the old CUP pressure and I've been a little cautious on CUP numbers.

To me, IMR 4895 has been pretty much the powder for lighter bullets in a .308, and it's always given excellent accuracy. 48.0 to 51.5 gr and as always start low and edge your way up.

I've got a 700P in .308 and it craters the primers (leaves a raised ridge around the firing pin strike indentation) pretty much from the mildest loads. Just a symptom of the bolt being drilled a little overly large for the firing pin diamter. So I keep a careful eye on primer flattening and case head expansion.

IMO you'll see better accuracy with a stick powder like IMR 4895, or 4064. They just don't meter as easily as ball powder out of a measure and should be weighed.

 

[ducksdime]

Re: new to reloading world my primers are cratering but my grups are good in my

thank you all very much i realy apreceiate it and thank you all for your time looks like i have some work to do. also is WCC brass any good thats what ive been using thanks again chris