M-40 , cast & 300 Yds ??

[Wayne S]

I'm building an M-40 "wantabe" ie, LH 700 HB 308, Choate stock, $$$ scope, ect. to play with on my clubs new 300 Yd. range. I'm thinking I need a 200 +-gn bullet over a 165 / 170 gn.
I'm thinking of starting with 28 IMR 4895 and a 311299 or RCBS 200 Sil.
Suggestions

[Outpost75]

Wayne,

That sounds fine on the low end. In my experience 30 grs. of either 4064, Varget or RL15 is in the right ballpark with #311299 or similar in either the .303 British or .308 Win. Essentially identical case capacity.

[Larry Gibson]

I'm thinking of starting with 28 IMR 4895 and a 311299 or RCBS 200 Sil.

Good place to start as mentioned. If you've not got the barrel yet I suggest a 26" barrel with 12" twist.

Larry Gibson

[Wayne S]

Thanks, luckily I found some Varget so there is another powder to try, Larry, the 26" 1-12 is what it has. Should be some interesting testing, as I have a 308 1-10 bbl for my Savage swap bbl., and the 1-11 on an M1A. Also cleaned out a "rat hole" and found some old IMR 4831, thought Id follow Bruce B's M1A data with that powder, now to find some Mag. primers

[Outpost75]

If you have any RL7, IMR8208M, or H322 those also work well, 28-30 grs. with #311299.

[Larry Gibson]

Wayne

You are definitely off to a great start. If the chance rolls around don't hesitate to try the Lyman 311466 or the LBT 150, especially over RL19 or AA4350.

Larry Gibson

[WILCO]

to play with on my clubs new 300 Yd. range.

Access to 300 yds. is great! Good luck and keep us posted.

[WILCO]

Suggestions


The LEE C309-200-R has a B.C. of .352.