Help on loading 30/338 Lapua 35degree Improved

#1 07-03-2003, 08:24 PM

I recently received my new rifle in 30/338 Lapua 35 degree Improved ( 300 Wambo Mag )
Case capacity is approx. 116grs of water.
What I want to know is since this is real close to the capacity of my 300 RUM do you think it will be ok to use the RUM data. The RUM is about 2-3 grs less so I was thinking that it would be safe to use. Also, does any one have a good load to try with the 240 SMK?
Thank you in advance for your replies,
Wayne

#2 07-03-2003, 08:39 PM

The data does not work well from the 300 UM.
The powder columns are different shapes.

For the 240 MK, start at 92 grains of H50-BMG and work up. 86 grains of Retumbo would also be a good starting point for the 240 MK.

#3 07-03-2003, 09:35 PM

S1,
Thank you again for your help.
Wayne

H-BAR · #4 07-04-2003, 10:10 AM

I am curious what twist rate did you have this rifle made in?

#5 07-04-2003, 01:03 PM

H-Bar,
I used a 1-10" twist. The reason I picked this twist is because everybody who uses the 240 SMK on this forum said it would work.
I just went out today and shot some 3 shot groups at 300yds to continue to break in the barrel. With fireformed brass and 88grs of Retumbo I shot a .950" group at 2964fps,
80 grs of RL25 did .785" at 2875fps and 95grs of WC872 was 1.050" at 2903fps.
Looks promising, will give more results as it comes in. Thanks to everybody who helped with advice and technical info.
Wayne

[ 07-04-2003: Message edited by: Wayne McD ]

Tim Behle · #6 07-05-2003, 07:26 PM

Wayne,

Sounds like you didn't waste any time getting that new rifle to shoot? Are you taking it to the next competition? When is it?

I should have my brake back and be shooting again sometime next week. If I can, I'd like to make it up there. Just promise not to laugh!

#7 07-05-2003, 08:30 PM

Tim,
The next match is Saturday the 12th. It would be real nice to have ya make it with your Tomahawk, hopefully you can make it. I'm not taking the new rifle to this one, I want to get at least 100rds thru it first. As of yesterday I've shot 38rds thru it, tomorrow morning possibly another 12 or so. I've been shooting a fouling shot then a 3 shot group and clean, the first 10 was shoot and clean after every shot, took me 3 days to shoot the first 10. The barrel is still fouling more then I would like it too but I've never shot a long bullet like the 240 at almost 3000fps so I don't know if this is normal or not.
Take care, good to hear from you.
Wayne