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Need some advise

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Unread 04-02-2010, 08:41 PM
Silver Member
Join Date: Sep 2008
Posts: 327
Re: Need some advise

well i was referring to using very heavy 7mm bullets such as the 200gr ULD wildcats etc for it to be at least a little practical... a 200gr ULD with a BC of circa .88 pushed by the .378 @ circa 3300fps would be ballisticallly very impressive with less windage and more downrange energy @ 1000yds than anything avail in 30cal.... still be a hell of a barrel burner tho and ive since found out that the 7mm-378 already exists, there is quite a few barrel makers that already have reamers for it... simply order the bbl with the appropriate twist and throated for the long pills

still not as practical as the 30cal no doubt, meerly offered it as a 'simple' rather than practical alternative for his existing caliber and rifle by not needing to change anything except his old barrel, dies and projectiles...

as for changing to a 30-338LM, what advantage would he get from all that cost of changing his current 30-.378? pretty much an exact ballistic twin of his current cartridge.... what would be the point besides simply spending money?

Last edited by groper; 04-02-2010 at 08:50 PM.
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Unread 04-02-2010, 09:33 PM
Platinum Member
Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 6,068
Re: Need some advise

The 200 grain bullets would be better, but there are some high BC 30 cal custom bullets on the way also.

There would be no advantage of going to a 30-338 LM from a 30-378, In fact it would be a step down, but the OP said he was looking for something "new" abd just wasn't interested in rechambering to a 30-378.

It would however meet his requirement for a 500 - 1K elk rifle. And there is Lapua brass availble. if he wants to match the 378 he could improve it, but that would cost more and shorten his barrel life and the standard LM case would be enough to do what he wants to accomplish. A 300 RUM might be a ggod way to go also.

Last edited by MontanaRifleman; 04-02-2010 at 09:38 PM.
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Unread 04-03-2010, 04:30 AM
Platinum Member
Join Date: Feb 2009
Posts: 3,548
Re: Need some advise

With the 30-338LM you get Lapua brass and it is different.
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Unread 04-04-2010, 12:43 PM
Bronze Member
Join Date: Aug 2008
Posts: 80
Re: Need some advise

well I have been away for awhile
Thanks to all for the insight, i am begining to get interested in your 300-338 Chad can you tell more detail such as barrel exp and how well it shoots with the heavy bulletts also the 30-338 LM what about it is tit the same or what is the diff in ballistics
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Unread 04-04-2010, 02:08 PM
Gold Member
Join Date: Jan 2007
Location: South Dakota
Posts: 753
Re: Need some advise

I set mine up to be a "flaming death" varminter. I shoot light 30 caliber bullets. I know a few years back somebody set some sort of 1k record with one using the heavy stuff. My gun is a 12 twist (I think-it's been a long time since I fussed with it, it's a closet queen now) and I once chronographed the 125 Noslers at 4375fps at the CorBon tunnel.

It doesn't take a genius to conclude with that kind of velocity barrels become consumables. . .

I imagine you could achieve some pretty good speeds with 180's. I'd guess at least in the 3600fps range. I don't suspect barrel life will go much past 1K rounds. Maybe even less. Probably close to what the big WBY gets.

No belt to deal with on the case. (they bug me) Easy to form the cases, easy to load. Just get a drum of RL22-25 and pour till all you see is the case neck looking back at you. Stealing the scoops from the candy isle bins at the grocery store makes quick work for dumping powder.

I made my own neck squisher die. Nothing special, it just gets the job done and the fire forming takes care of the rest.

That's about it. last time I played with this thing it'd hold sub 1/3 groups at 100. I've never had a chance to really stretch its legs. I'll get after it this summer and devote some time.

Brass of course requires dipping into the college fund, but such is the nature for anything good these days. One word of advise. Lapua brass is great stuff, but the rims tend to run a smidge heavier than Norma. If you have issues with extraction look here first. I just modified the T slot extractor and its run fine ever since.

Good luck.
Chad Dixon
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