The BC of the 250 gr 338 is .567 as per Sierra. The 338 300 gr MK works out to close to .800. It is actually .787.
The 30 Cal 240 gr MK is .711
We have found that the 30 Cal 240 gr Sierra MK at 3200 FPS will out perform the 338/250 gr past 750 yards to 1800 yds all day long, but it won't touch the 338 /300 gr MK at at the same speed at any range.
As last year, the hold up for me would be the obligation to the Williamsport club where Carol and I agreed to do the stats for another year.
The same would probably hold true with Boyd as he is now an Officer and we must be there.
Maybe somehow we could do it though? As you know, I always go to Colorado hunting in late October and hate to make two trips within acouple months out west. I hate to drive and have a whole truck load of equipment when I go anywhere.
As an add on here, I see where people are talking about the 30 Wolf, 338 Yoge and the 30/378 capacity.
I shoot 122.5 grs of highly secret powder in my 338/416 Rigby IMP when using the 300 gr Sierra MK.
The velocity I have seen over my Oehler Chronagraph has been 3310 FPS.
I have a friend that has the same chambering with a 40" barrel that runs his at 3350 FPS and go higher. That too is with a 300 gr 338 MK.
These are strictly cold weather loads.
To the one poster that asked about the 30/378 and some loads, I had one with a 37" barrel that I ran 200 gr Mk bullets out of at 3600 FPS. That barrel is now on my Tomahawk, 34" long and still shoots well.
I used 117 gr of WC872 ball powder (like H870) with the 200 gr bullet. Start out low and don't go above 115Gr if you use H870.
Don't try that load in your rifle if it's hot weather.
In fact, I will not be responsible for anyone using a load in their rifle that I have had success with in the past and written about on this forum. Your on your own.
Ric-- as soon as my significant other gets over her bout with 24 hour morning sickness, we will be enroute to Cody---probably sometime between Mid-March and late May--The later the better, as far as the PD's are concerned... [img]images/icons/grin.gif[/img]