So yea!, finally got that modern actioned .303 I spoke of all those years ago. Yesterday I fireformed the cases, almost 100 cases I guess all in all - just hope I did it slow enough, as not to burn the barrel.
So I now have the weapon and the cases, some 170 Gr Ballistix bullets and my likely bullet of choice, a 180 gr APM bullet. The APM is a cup and core bullet has an rather thick pure copper jacket, 0.3 mm and a huge exposed lead point. I am hoping, believing that this will give me that slow deep, expanding bullet I am searching for.
I do not have S341, but do have 321, 335 and 365. Using the Remington 180gr .312 bullet as a parent bullet (APM is not on my quick load) I have tried very superficially to find a starting load and propellent.
Barrel 700 mm - case capacity after forming is 58.8 ml
I am wanting to achieve 2650 fps - what I consider a bit of a magic velocity for the heavier bullets, and the magic speed in Cody's 7mm08, the rifle that introduced me to slower shooting.
A very basic sweep through quick load gives me the following.
S365 at 55 gr gives me 2650 fps at 41000 psi and 98 % case fill
S335 at 45 gr gives me 2600 fps at 50600 psi and a 88 % case fill
S321 at 46 gr gives me 2640 fps at 47555 psi and a 82 % case fill
I will after shooting over the chrony do the QL in detail and adjust burn rate etc
I will have to pull all my Ballistix 170 gr bullets from their cases as to fireform the cases before developing a high pressure top velocity load for the mono bullet. I will request input again then, but now, I just want a relatively slow and heavy inside 250 m meat hunting load.
Any input will be appreciated.
