|When I talked to my friend and aske about the parent case, he thought it was a .308 Win. I asked it might be stamped 307, which would actually make his barrel a 7 MM JDJ 2 (If I understood what I read online correctly).|
Yes the parent case is the 307 [ rimmed 308]
I have 2 Barrels a 21 inch bull bbl rifle and a super 16 cut down to 15 and 7/8 with a custom muzzle break to make it just over 18
To be clear I can take the break off to make it a legal hunting pistol.[NY]
This is to allow them to be used for rifle and pistol hunting in NY I have one rifle action and one pistol action! [ Legal Federal Rules]
I reload this using the following loads
110 Grain Speer TNT bullets with 40 Gr of AA2460 It is very fast over 2800 in the 21 inch rifle and over 2600 in the 16 inch pistol.
120 Ballistic tip bullet with 42 Grains of AA2520 does well too.
I have loaded a few heaver bullets but I am a Velocity guy and they fell short of expectation.
At one time I was able to get 3000 fps with Barns 100 Gr bullets and Win 760 but when I told JD Jones he almost had a heart attack ! so I backed off that load. but it was not causing any pressure signs ?