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load data for 300 grain .338 scenar

Re: load data for 300 grain .338 scenar

Got to try out a load this weekend:

Rifle:
GAP Templar, .338 LM, throated for 3.750, Seekins BM
28.5" Bartlein, 9.5 twist. Purchased from TurtleSniper. Great rifle, good deal, had a delay on my end to take delivery, he was very patient and easy to work with.

94 gr. Retumbo, 3.740 COAL, 300 gr. Scenar, 215M,

Ave: 2849
ES: 23
SD: 9

No pressure signs at all. His best load was 95gr. Retumbo. Will try that next time out. Got .495 @ 100 yds.

 
Re: load data for 300 grain .338 scenar

Desert Fox,

A bunch of guys I shoot with, one being my gunsmith, are shooting the 338 lapua Auck Imp round. Mine is being built, but they have been blamming theres for a few years now. They use US869 only for powder and are running 300gr smk's and senars at around 3100 fps out of 29.5 inch barrels(mostly use the smk for availability sake). They are running between 110-112 grns with the 300's and have loaded as much as 117gns behind the 250's with no pressure signs. The 250's didn't shoot great, but they can handle it. Give the powder a try. It works really well. The last time we were out, they were grouping little less than 1/2 moa at 1000 consistently from both rifles(they were having a good day). Both rifles are nesika actions, Rock creek 5r barrels 9.4 twist at 29.5 inches.
 
Re: load data for 300 grain .338 scenar

I'm getting very similar results as Redmist, velocity and accuracy, using 90gr RL25 and 300 Scenars out of my Remington 700 MLR. COL is 3.66" (mag limited), which is about .050" of the lands. There are no high pressure signs. Good primer, easy bolt lift and case head expansion is about .001" using once fired Hornady brass.
88gr of RL25 did not work as well.
 
Re: load data for 300 grain .338 scenar

I use Fed 215 primer, Lapua brass, 300 gr lapua scenar, US 869 powder at 102gr
out of my standard throat AR-30... Load may seem light but this is the sweet spot.
I seat to lapua factory depth for the 300 gr scenar. After trying several different approaches, I found the factory seat depth to give the best result. The rifle is set up for 1000 yd zero and I use the TMR for extended range. Accuracy is simply insane.
Of the powders I have tried, the US 869 is simply the best all around... measures beautifully, very stable, give it a try.
 
Re: load data for 300 grain .338 scenar

I use a broughton 28" 9.3 twist, 94g, 95g and 96g Retumbo depending on the temperature. 94g does 2886 and more from 90deg and up. 96g under 60deg keeps it at 2886 or close. It will shoot one half minute at a thousand all day with 300g SMKs or 300g Scenars. I think it would shoot rocks good. 6" groups at 1600 yds are not uncommon. 1900 and 2000yds are a little more work but not bad. At 2400 and 2500yds it is on target shooting at a man size silouete. The COAL with the Scenar is 3.865 and 3.885 with the SMK. 94g of RL25 in heat will hit high 29s easy. When its cool 95g of Rl25 will hit 2930. Never any pressure signs. 215 primers shoot 20 fps less than CCI 250s. Both powders are good. The 300g rounds are flatout better than the 250s. Good luck.
 
Re: load data for 300 grain .338 scenar

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Does the 570 reduce the amount of rounds you can fire accurately before you need to clean?</div></div>

Not more than N170 or N560. It just keeps the barrel dirtier and some people lose their sleep because of that. Most of the dirt is actually graphite used to slow down the burning rate.

If you hate dirty patches coming out of the rifle barrell forget N570. You will "never" get it 100% clean again. And if you do then you have to shoot 20 rounds minimum to condition it back to normal. Either you get used to living with graphited bores or you don´t.

300 grainers with max loads will shorten the throat life somewhat but I doubt it really matters. We are probably talking about 100-200 rounds difference, max.

With N570 is pretty much impossible to overload with 250 Scenars. One can stuff the Lapua case full and the pressures will stay within reason.

300 Scenars and MKs tolerate wind better but with full loads they do push around the shooter much more than 250 grainers. Much more than the calculator would make you believe.

I use N560 for 250 Scenars.
 
Re: load data for 300 grain .338 scenar

Hy guys, experience with N560 and 300 gr Lapua Scenar?
 
Re: load data for 300 grain .338 scenar

Doesn't help much with handloads other than providing a reference, but I've fired thousands of rounds of Lapua factory 300gr Scenar ammo in the last year and have found it to be tremendously accurate (generally 1/2MOA) in several dozen rifles. I get approx 2725fps from a fairly new 24.5" barrel (unsuppressed).

I've also confirmed that 300gr Scenars flying overhead at 1700 meters (7,000 ASL) are still supersonic at 2725fps muzzle velocity.

....edited to add: SD has been from 11fps to 16fps based on rifle, ammo let, etc....


IMG_4696.jpg

IMG_4701.jpg
 
Re: load data for 300 grain .338 scenar

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: greentimber</div><div class="ubbcode-body">
I've also confirmed that 300gr Scenars flying overhead at 1700 meters (7,000 ASL) are still supersonic at 2725fps muzzle velocity.

</div></div>

One can hope that is not on a two way range.
 
Re: load data for 300 grain .338 scenar

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Chiller</div><div class="ubbcode-body">

One can hope that is not on a two way range. </div></div>

No. Just research!
 
Re: load data for 300 grain .338 scenar

Nice pics Kyle....looks like an antelope rifle to me...........grin!
 
Re: load data for 300 grain .338 scenar

Hello,
New to the hide but figured this would be a good place to start. Just got my 338 lapua and need to start the break in period. I am planning on using REL25 with 300 grain Scenars with Lapua brass. 338 Tac Action and Rock barrel 9.4 twist throated for a COAL of 3.900'' using Seekins DBM. Does anyone have any suggestions for loads using REL 25???

Thanks much!
 
Re: load data for 300 grain .338 scenar

250gn Scenar, 98.0g Retumbo (max load on Hog's manual), I get 3050fps...
300gn Scenar, 94.0g Retumbo (max load on Hog's manual), I get 2750fps

On both loads I am about 100fps higher than the Hodgdon manual predicts.
The temp was about 70deg F, so that wasn't a factor. I wonder if my RCBS scale is off... I check calibration with the weights occasionally and it weighs out 50.0 grams maybe just off .2 to .4 grains.

For my Rem 700 PS 338LM, with 26" 1:10 twist, the cases on both loads are moderately difficult to lift the bolt out. Not until I dip below 90 grains of Retumbo on my scale do the cases become easy to lift out. Strange.

edit: or my Chrono is off... I will calibrate it with a Fed GM2 308 round which is very consistent at 2700fps. I will update if I can prove the Chrono is good and can be removed from the equation.
 
Re: load data for 300 grain .338 scenar

btw... what do you 338LM shooters use for jump... I am using 0.010" ... though measuring it... it's coming out to more like 0.008" ... maybe this is too close to the lands and pressures are building up before the bullet starts engraving down the barrel?

Perhaps I will try to go 0.020" back...?

edit: I should add that the both 250 and 300gn loads are extremely accurate at 100 yards... holes are largely overlapping during sight in. fwiw.
 
Re: load data for 300 grain .338 scenar

good article on interior ballistics... http://kwk.us/ibsw.html

worth a read if you haven't looked into pressure vs velocity. Some surprises herein.
 
Re: load data for 300 grain .338 scenar

can anyone shed light on this... I am getting 2800-2850fps from 94.0gr of Retumbo and Fed 215M primer, when the Hogdon book shows I should be getting around 200fps lower... I have measured the cartridge OAL post firing... the neck is definitely not jamming into the throat, it's short enough. What's left... the only thing I can think of is neck tension is too tight, but measuring things according to Redding, the 367 neck die bushing I am using is right.

Last time I loaded this same brass using 92.0g Retumbo I got 2700+fps which is still 50fps higher than the databook, but even then it was not 2800-2850fps from the same Retumbo batch...

Temp was 70deg F. Rifle Rem 700 338LM, 26" barrel.

edit: ps, my bullet jump is about 0.010" ...
 
Re: load data for 300 grain .338 scenar

Using Lapua brass, federal primers, 88-89gr RE 25 with 300 grain scenars shooting very well from my rock creek 1:9.4 26'' barrel at @ 2685 fps w/ 88gr and 2735 fps w/89 grn. shooting sub 1/2 MOA (1.5'' groups at 300 yards and 6-8'') at 1000 yards. My coal is 3.90'' and ogive is 3.165''.
 
Re: load data for 300 grain .338 scenar

I have been to the range several times now testing and the retumbo 88.5 grains is my ticket. i shot 6 shots on body steels and called all head shots first was right in neck and i dialed up and the other 5 all in head. shot today and they had small swingers and center body had 4 shots left they were all touchin. I cant say enough about this load.
 
Re: load data for 300 grain .338 scenar

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 1fstTA</div><div class="ubbcode-body">I have been to the range several times now testing and the retumbo 88.5 grains is my ticket. i shot 6 shots on body steels and called all head shots first was right in neck and i dialed up and the other 5 all in head. shot today and they had small swingers and center body had 4 shots left they were all touchin. I cant say enough about this load. </div></div>

at what distance?
 
Re: load data for 300 grain .338 scenar

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 1fstTA</div><div class="ubbcode-body">1k. </div></div>

Nice. Of course it all depends on barrel length and all, but 88.5 of Retumbo seems pretty light... in my Rem 700 that wouldn't probably get past 2600 or maybe even 2500fps.
 
Re: load data for 300 grain .338 scenar

Anyone shooting the 300 scenars try the new 300 Bergers? How do they compare for accuracy and velocity?
 
Re: load data for 300 grain .338 scenar

i set up three equal size targets at 1550 yards, shot 10 sierras, 10 scenars and 10 bergers. All grouped well at 100 yards, they where all moving approx 2750 fps, I hit my steel 5/10 w/ sierra, 6/10 w/ scenar and 9/10 w/ berger. Same conditions, all 300 grn, Bc's are I think .764, .768 and .891, that is my experience w/ them. so I'm sticking w/ the bergers.
 
Re: load data for 300 grain .338 scenar

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Brado16</div><div class="ubbcode-body">Anyone shooting the 300 scenars try the new 300 Bergers? How do they compare for accuracy and velocity? </div></div>

The 300 grain Bergers are awesome for accuracy and speed. Give Vit N570 a try for lower pressures and higher velocities.

A suggestion to those that are interested in running a longer magazine to benefit from shooting the 300gr bullets, take a look at Wyatt's. His mags allow for a cartridge length of 3.790. http://wyattsoutdoor.com/product_info.php/cPath/2/products_id/52 However, I'm not sure if his bottom metal is compatible with Badger DBM inlet.
 
Re: load data for 300 grain .338 scenar

I have some 300 bergers on their way, will try with RL25 since this if what I have had luck with the scenars. Also want to try h1000.

Animal- how many grains of N570 and what speeds are you seeing? I'm running the seekins dbm with the 300 scenars with a coal of 3.90"and it works pretty well.
 
Re: load data for 300 grain .338 scenar

Animal Thank You for the suggestion,
How fast have you pushed these bullets and still retained a reliable round. What twist also?
 
Re: load data for 300 grain .338 scenar

Sorry it's taken so long to respond.

I'm using a Bartlein 5R 9.3 twist at 26 inches and getting 2800fps with 91.0 of Vit N570, F215M in a 338 Norma Mag. The 300 gr hybrid bullet is seated back to fit in the AICS mag box so it's got some jump to it. Start 5-10% low and work up your load for safety. The chamber I have is throated for the 300 gr SMK to fit in the AICS mag box with minimal jump.

I haven't messed with the load range too much because 2800 was shooting bug holes so I just left it alone. No extractor marks and the bolt lifted easily.

I'm not sure about what twist is optimum for the 300 gr hybrids but the 9.3-9.5 twist seems to be the trend towards the 300 gr bullets.
 
Re: load data for 300 grain .338 scenar

I shoot a 338 Win Mag and have some 300 gr Lapua's they shoot fine but I have always had good luck with Berger so next order will be some 300 gr Hybrids from Berger and if they work like they have in my 308's and 7mm Rem Mag then I'll stick with them for powder I'll be using IMR-4350 at think it is at 61 grs. now but with Berger I seem to be able to load down and still get my speeds.
 
Re: load data for 300 grain .338 scenar

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: laylowlong</div><div class="ubbcode-body">Of the powders I have tried, the US 869 is simply the best all around... measures beautifully, very stable, give it a try. </div></div>

I've been using WC860 (milsurp 50BMG powder) and it seems pretty close to US869, at least in quickload:

http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2933597

I'm getting a bit over 2700fps with the 300SMK in a 26" barrel.
The load is 106 grains and the deviation seems better with regular non-magnum primers.
 
Re: load data for 300 grain .338 scenar

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 1fstTA</div><div class="ubbcode-body">I have been to the range several times now testing and the retumbo 88.5 grains is my ticket. i shot 6 shots on body steels and called all head shots first was right in neck and i dialed up and the other 5 all in head. shot today and they had small swingers and center body had 4 shots left they were all touchin. I cant say enough about this load. </div></div>


What are you shooting this load out of? My 110ba loves this load out to 500. Farthest I've been was 12-1400yds est. and it was still real tight.
 
Re: load data for 300 grain .338 scenar

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JTG</div><div class="ubbcode-body">i set up three equal size targets at 1550 yards, shot 10 sierras, 10 scenars and 10 bergers. All grouped well at 100 yards, they where all moving approx 2750 fps, I hit my steel 5/10 w/ sierra, 6/10 w/ scenar and 9/10 w/ berger. Same conditions, all 300 grn, Bc's are I think .764, .768 and .891, that is my experience w/ them. so I'm sticking w/ the bergers. </div></div>

Not trying to question this, but is this a fair test? Did you shoot some extra rounds to get each load on the target before you shot your 10 round string?

Here's an experience of mine. One day I'm confirming drops with my .338 snipetac, 300gr Bergers. I put 3 hits at a mile, actually 1754 yards, got my drops. So the next target is set at 1850, I have 5 rounds left, the bullets hit inches right and left, no hits, bummer. Well I have 7 rounds of 275gr Rocky Mtn bullets loaded up, they were running 130fps faster than the Berger load. So the guy spotting for me and myself put our beady little brains together and figure using the same dope this load should shoot close to 2000 yards. We check the ballistic charts and yes it's close. So I shoot at the 2000 yarder, low, again low, finally on the 4th shot it hit, then two more hits, missed the last one, bummer.
So, was the RM load better than the Berger? In a way I think it was, but it didn't matter because I wasn't buying any more of the RM bullets. But this was not a fair test in my book.
 
Re: load data for 300 grain .338 scenar

McGruber. Are you telling us you are using .891 for the BC on the Berger and getting hits at 1550. As I understand it Berger revised the BC down to .81 or so.
 
300gr Lapua Scenar with US 869?

I'm currently testing 300gr SMK with 105gr US 869.

Only getting 2600fps in a 26" Barrett MRAD, hoping the scenars are a bit quicker.

(22°F 1600' ASL)
 
  • Wow
Reactions: Aftermath
For the long lost thread for .338LM load
Bullet 300gr Scenar
Primer 215M
Brass Nosler
Powder Retumbo 90.00gr
C.O.A.L 3.713
AVG FPS 2786
SD 8.4
 
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