Roll your own! I have a Marlin 336 and tried Rem 170 gr Core-loks factory loads . A dismal 4-1/2 " groups. I thought this sucks. Got some 30-30 dies and loaded up and my groups shrunk dramatically to just under 1-1/2 " and with 100 fps faster than factory ammo. I used Rem core-lok 170 gr bullets Rem brass,WW lr primers 33 gr H4895 . This is a Max load approach with caution. This gave me a 5 shot groups avg. 1-3/8" and avg. vel of 2370 fps.