Spike Camp

338-378 accumark

Re: 338-378 accumark
« Reply #30 on: February 09, 2019, 12:54:35 PM »
Well, I decided since the factory Ammo did well,
I’d play around with the 225 Nosler accubond. So far, it hates them!
Cleaned the bore after the five shot factory group. Then loaded some Nosler accubonds to try. It was 3”.

Loaded some of the Barnes 225ttsx, and tried to replicate factory Ammo velocity. NOT max but close,
Seated same depth, and crimped.
4 shots.
1 to foul the barrel back a little, 3 shot group. 0.991”
Minus the fouling shot and it was 0.773”
So I am going to continue to experiment with powders and bullets but the Barnes 225ttsx seems to be consistently sub MOA.

Re: 338-378 accumark
« Reply #31 on: February 09, 2019, 01:05:34 PM »
That's a good group in my opinion.  It certainly seems like your rifle likes that weight bullet.  So what that has me thinking is it likes bullets on the lighter end which isn't a bad thing.  I would give the 200 grain Combined Technologies Ballistic  Silver Tips or the 225 grain AccuBonds for a try since they're pretty cheap, you can get a box either of them for $19.95 for a box of fifty. 

Here's a link to the Combined Technologies Ballistic Tips:

http://www.shootersproshop.com/loading-reloading-bullets/nosler-338-caliber-200-grain-ct-ballistic-silvertip-over-run-50ct.html

Here's a link to the AccuBonds:

http://www.shootersproshop.com/nosler-products/nosler-blemished-2nds/nosler-blemished-bullets/nosler-338-caliber-225-grain-accubond-bullet-blem-50ct.html

I don't know if you have Nolser's reloading manual so here's the links to their data that's online and the same as in the books for both bullets:

200 and 210 grain bullets:

https://load-data.nosler.com/load-data/338-378-weatherby-magnum/

225 grain bullets:

https://load-data.nosler.com/load-data/338-378-weatherby-magnum/
Nothing is better than a Weatherby, big bore magnum, or a Colt.

Re: 338-378 accumark
« Reply #32 on: February 09, 2019, 01:06:36 PM »
What load were you using with the 225 grain Accubonds?  As for your fouling shot I wouldn't include that in the group's measurement because it was intended to foul the barrel and as such the barrel was clean.
« Last Edit: February 09, 2019, 01:08:25 PM by Chris338378 »
Nothing is better than a Weatherby, big bore magnum, or a Colt.

Blackbear3

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Re: 338-378 accumark
« Reply #33 on: February 09, 2019, 06:20:24 PM »
The 225 ttsx are definitely worth playing around with after your last session, your rifle seems to prefer them so far. Maybe adjust the quantity of powder then adjust the length if you want.  If you don't tighten the groups to your liking doing that, then go with Chris's suggestions for other bullets. Sounds like your having fun and getting some positive results.
We stand for the Flag, and we kneel for the fallen!!!

Doug-NRA Life Member

Re: 338-378 accumark
« Reply #34 on: February 10, 2019, 06:16:15 AM »
Chris338378,
I was shooting the nosler 225 accubond over 109.0 grain of H1000

I have ALWAYS started at the very bottom of the powder scale and worked upwards. However, on this rifle and the results being as they have and no sign or pressure damage to case or primer I went with the 109.0 grain charge as that was nosler’s most accurate load tested and was in the middle ground of the powder scale.

Without the fouling shot, the noslers were still in the neighborhood of 2.5”-3”


I am going to try them over some RL 25

The last group I shot with the Barnes would be a 3 shot group measuring really close to 1/2” without counting the foul shot.


Doug,
I am definitely having some fun now I have found at least one load that it likes. I was starting to believe I had bought the most expensive rifle of my life and would not get it lined out to suit

Re: 338-378 accumark
« Reply #35 on: February 10, 2019, 07:04:47 AM »
According to Nosler's load data for the 225 grain AccuBonds the most accurate power is Viht N165 and the most accurate charge weight listed is 102.5 grains.  For that powder they list the minimum charge weight of 100.5 grains and a maximum charge of 104.5 grains.  I would give that powder and charge a try and see how it groups.  As for using RL25 Nosler doesn't list any data for that powder with the 225 grain AccuBonds so I wouldn't suggest using it for that bullet.  Actually the only bullet they have data for RL25 is for the 300 grain AccuBonds or Custom Competitions and even with those bullets it's not listed as the most accurate powder.  Nosler's most accurate powder and powder charge normally the most accurate in most rifles so it's well worth trying what they suggest. 
Nothing is better than a Weatherby, big bore magnum, or a Colt.

Re: 338-378 accumark
« Reply #36 on: February 10, 2019, 08:48:09 AM »
Yes you are correct I spoke out of turn on the RL25for the 225accubonds

Who makes the Viht N165?
Not sure where to even find it.
I will try it for sure and post results. May take a few days. We are under a flood warning from now till12pm Tuesday so I prolly won’t be shooting much till after then.

Re: 338-378 accumark
« Reply #37 on: February 10, 2019, 08:52:58 AM »
Viht N165 is made by Vihtavuori. 

Here's a link to it on the company's website:

https://www.vihtavuori.com/powder/n165-rifle-powder/

Here's a link to it on MidwayUSA so you know what the can looks like:

https://www.midwayusa.com/product/1013085943/vihtavuori-n165-smokeless-gun-powder
Nothing is better than a Weatherby, big bore magnum, or a Colt.

Re: 338-378 accumark
« Reply #38 on: February 10, 2019, 01:29:52 PM »
My 340 Wby did not like the 225g acc. either but it shot the 250g acc. in to 1/2 inch.
John

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Re: 338-378 accumark
« Reply #39 on: February 10, 2019, 06:24:16 PM »
I use N160 in my 270 Winchester and love it, I highly recommend Vihtavuori powder.
We stand for the Flag, and we kneel for the fallen!!!

Doug-NRA Life Member

Re: 338-378 accumark
« Reply #40 on: February 17, 2019, 04:43:39 PM »
Any updates on how you're making out?
Nothing is better than a Weatherby, big bore magnum, or a Colt.

Re: 338-378 accumark
« Reply #41 on: February 20, 2019, 07:12:42 AM »
Waiting on more federal215M primers.
I did shoot it on paper with the factory Ammo @300 yards. Shoots very consistently and seems to be very sub MOA at that range.

Also put it on the 10” steel gong at 550 with that factory Ammo. Calculated the dope, adjusted and rang the steel on first shot at 550 so I am happy.
Also waiting on vith powder to arrive with the F215M primers to try with the accubonds.

Re: 338-378 accumark
« Reply #42 on: February 20, 2019, 08:31:29 PM »
You definitely have a shooter on your hands and have it figured out pretty well to ring steel at 550 yards on the first shot. 
Nothing is better than a Weatherby, big bore magnum, or a Colt.

Re: 338-378 accumark
« Reply #43 on: Today at 12:46:14 PM »
I would think those 265 Accubond would be a sweet setup.

maybe not the highest BC, but I had some 275gr Swift A-Frames, loaded for my .340wby

also maybe try that 300 Accubond.