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Old 09-11-2007, 08:28 AM
Silver Member
Join Date: Oct 2005
Posts: 117

How does this round run compared to the other 33s (lapua,Ultra,340) What can you get with a 250 and 300 MKs. Can you break 3000 with the 300. Also hows the accuracy with this round. Will do a 28 inch 5.5 bbl if I do the wby. Thanks for any replies.
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Old 09-11-2007, 08:46 AM
Platinum Member
Join Date: Jul 2004
Location: Texas
Posts: 5,441

It is the most powerful of the factory 338's

As for the 5.5 barrel it's going to be mean unless you install
a break.

Thats the reason I like the #7 taper (tames it down and no
muzzel break)

As far as 3000 fps from a 28" barrel "maybe" but with a 30"

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Old 09-11-2007, 03:46 PM
Posts: n/a

I easily get 3000 with the 338/378 using the 300gr Sierra and retumbo.

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Old 09-11-2007, 05:14 PM
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Join Date: Feb 2005
Location: USA
Posts: 2,598
What barrel lenght and how many loads before your brass has loose primer pockets..........How manny grains of Retumbo?
range it,check the wind, dial in correction, aim and only one shot
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Old 09-11-2007, 06:06 PM
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Join Date: Jun 2004
Location: Texas
Posts: 1,027
Casscade; I have a 13 lb, 27 1/4" barrel, rifle that I've started working up. So far, 2760 fps with the 300 smkhp and 110 gr of H-5010. Very mild, 3/4" 5 shot @ 100yds. I believe I can make 2800 fps, maybe not with 5010 though. I expect to get down to 1/2 moa. I don't think I have enough barrel to get 2850, pushing hard.

IMO, a 5.5 is way too light for a barrel over 26" in this caliber, let alone 30".
JECustom is right, it will be unpleasant without a brake, and the brake is unpleasant to hunt with.

Chawlston, ditto jwp's questions. I haven't had any luck with Retumbo. What primer do you use? 3000 fps is a great neighborhood!

jwp, I get 3-5 firings before the pocket gets too loose.

There's been a lot of good discussion pro and con about the Wby calibers and guns recently. The MK V's are my favorite actions, and the only factory action that I will build a .378 based caliber rifle on.

Texas State Rifle Association Life Member
NRA Endowment Life Member

A big fast bullet will beat a little fast bullet every time
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Old 09-12-2007, 10:19 AM
Silver Member
Join Date: Oct 2005
Posts: 117
Have 3 lapuas already and just wanted to do something different. Was hoping I could a 300 at 3000 fps with this round out of a 28 inch pipe.
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Old 09-12-2007, 04:15 PM
Posts: n/a
I am still working on the original brass that has seven firings on it, 106.90gr on my acculab scale (was 107gr on the RCBS). Federal 215 primers. I am at sea level which is higher humidity (read lower BC) and quicker to hit a pressure limit. You guys higher up in altitude have an advantage on burn rate and bullet flight. Anyway, this is a very good load for my gun which is a Hall Express in a McMillan McHale stock with a 29" cryroed (didn't realize that until now) K&P fluted barrel. I have found that these custom actions will take a tad more powder prior to showing pressure signs.

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