240smk's in a 300WM

Discussion in 'Big Stuff -- 6.5mm, 7mm, 30 Cal' started by Ksmirk, Oct 10, 2018.

  1. Ksmirk

    Ksmirk

    Joined:
    Oct 8, 2007
    Messages:
    387
    Did some searching and either there isn't much info or my search foo sucks lol I put together a 300WM and set it up for the Berger 215's and well my barrel just has no love for the Berger's :( so I'm giving a few other bullets a try and like the title not much info out there on 240's with a 300WM so the reason I ask. This chamber was throated long and with the 240's I've got an ogive length to the lands of 2.932" with a coal of 3.5" so I've got a bit more powder room in the case and was just curious if any of you fella's have played with them in your rifles and your results. Thanks,

    Kirk
     
  2. simo hayha

    simo hayha

    Joined:
    Jul 18, 2014
    Messages:
    92
    Got some buds that shoot the 220smk in the 300wm. They like em
     
  3. dkhunt14

    dkhunt14

    Joined:
    Jan 15, 2012
    Messages:
    5,499
    I shot the 240 in a 308 Baer for 1000 yard BR. You can get about 2800. The bullet has a very long bearing surface and needs a long freebore. Way more them a 210 or 215 needs. They are no good for hunting and will not open. I tried them on groundhogs and they would not kill. It was fairly accurate and i won some aggregates with them.

    The Baer would be real close to capacity of a 300 WM. It is a 300 Weatherby IMP. Matt
     
  4. Ksmirk

    Ksmirk

    Joined:
    Oct 8, 2007
    Messages:
    387
    This rifle won't be for hunting as the biggest thing around here are deer and ya don't need a cannon for those, this is a strictly target/ steel rifle just for playing. If I can get anything promising from the 240's I still have the throating reamer I can adjust as I'll agree the bearing surface is massive compared to the 210, 215, and 200's! wish I knew Sierra was coming out with the 230's I'd have tried to find a 8T barrel as I doubt my 9T would be a good match I'm told by many. I had good luck with SD and velocity from the 215 Berger's just couldn't get them to shoot what I would consider respectable groups, tried many different jumps, powder charges all the normal stuff and no love.

    dkhunt14 do yo mind me asking your barrel length? this one is 28" and set up as a single shot so the length can be adjusted fairly easily :) the best I could muster from the Berger's was Retumbo at 3020fps but I don't consider 1 1/4" at 100 yards acceptable! threw some old 208 Amax loads together and the rifle will shoot 1/2-5/8 but I'd rather shoot heavier bullets for the ranges I'm looking at.

    Thanks for the info I appreciate the advice.

    Kirk
     
  5. dkhunt14

    dkhunt14

    Joined:
    Jan 15, 2012
    Messages:
    5,499
    My barrel was 30 inches. They shot alot of 10 shot groups of 5 inches at 1000. We shot them in 10 twists. Sierra tends to overestimate the twist. Matt
     
  6. Cody Richardson

    Cody Richardson Silver $$ Contributor

    Joined:
    Sep 6, 2012
    Messages:
    448
    Have you tried the 230 Bergers?
     
    FatBoy likes this.
  7. dkhunt14

    dkhunt14

    Joined:
    Jan 15, 2012
    Messages:
    5,499
    No I haven't shot the 230 Berger. I have since switched to a smaller case, the 300WSM, and all i shoot is the 210 VLD. Matt
     
  8. Cody Richardson

    Cody Richardson Silver $$ Contributor

    Joined:
    Sep 6, 2012
    Messages:
    448
    Haven’t tried the VLD’s but I’ve great luck with the 215’s and the 230’s in my wsm
     
  9. Ksmirk

    Ksmirk

    Joined:
    Oct 8, 2007
    Messages:
    387
    Haven’t tried the 230 Berger, I normally start with the bergers and if I can’t get them to shoot switch to the smk’s and so far it’s been working. I got some of the 240’s and looks like I’ll have a mess of bullet in the case so not sure they will work for my goals :( or at least I’m not confident enough to run a throating reamer in there!

    I really wish the 215 bergers would have shot well! it would have saved a mess of time for sure. This project has been off and on for the last two years as I seem to get frustrated with my results probably due to this being my first anything that uses over 60gr of powder plus I hear the WM can be a bit finicky.... I’m hard headed so a match made in heaven right lol

    Fellas thanks for the info I appreciate it!

    Kirk
     
  10. JBT

    JBT Gold $$ Contributor

    Joined:
    Jan 24, 2017
    Messages:
    958
    What seating depths did you try with the 215’s? I have shot them out of 3 different .300 Win Mags and they all shot well.
     
  11. Ksmirk

    Ksmirk

    Joined:
    Oct 8, 2007
    Messages:
    387
    Anywhere from a .010" jam to .150" off the lands, powder charges in .5 increments until I hit pressure then with H1000 and Retumbo and the best I could get out of the 215's was right at an inch most over 1 1/4". I had some old Amax 208's and the 175SMK's just to see if it made a difference and I was at the 1/2"-5/8" range with both so the rifle will shoot fair it just doesn't seem to like the 215's.

    I spoke with several folks who shoot the 300WM and 90% of them stated to shoot the 215 Berger's so I went with their suggestion and chambered and throated the rifle for the 215's and I really busted my ass to get them to shoot but no love. I've always had great luck with the SMK's so thought I'd go that direction but after getting the 240's I'm not really sure they will be that great unless I throat the chamber out more and doing that if they don't shoot well that would be a $350 ooopsie and a new barrel blank so thinking it's back to the drawing board and more searches for bullets.

    Kirk
     
  12. dkhunt14

    dkhunt14

    Joined:
    Jan 15, 2012
    Messages:
    5,499
    I think your powder selection is too slow. We always shot H4831SC or H4350 in the Baer case for accuracy. The slowest powder I used was RE25. Matt
     
  13. Ksmirk

    Ksmirk

    Joined:
    Oct 8, 2007
    Messages:
    387
    I have some H4831SC that I use in my 243, funny I was using the Retumbo in my last 243 with good results and most of the reason I still have a mess of it! pressure will dang sure surprise you with the Retumbo. So with barrel length and bullet weight you feel the powder is too slow? the fella's having the great luck with the 215 Berger's swore by the H1000 as it was a magical combination BUT I have enough of the H4831SC that I can give it a go.

    I do know if I can get the Retumbo to shoot that would be wonderful! as I still have roughly 6# left lol I will dig around and see if I can find any data but with my chamber I'll for sure have to work up as my Retumbo loads I found pressure sign at 82.0 just a light swipe and no difficult bolt lift so I've got a pretty fair amount of powder space.

    Matt thanks for the info! I appreciate the direction as this rifle being the first magnum I've really messed with has been a huge learning curve and I feel I have a mess more to learn, get me back on the 6mm's I feel way more confident.

    Kirk
     
  14. dkhunt14

    dkhunt14

    Joined:
    Jan 15, 2012
    Messages:
    5,499
    Those are the two powders most the 1000 yard BR guys used in the Baer. H4350 is a bit fast but worked in some guns that didn't like the H4831. The Baer case was a 300 Weatherby IMP so it should be close to a 300 WIN in capacity. The 240 liked around 2800 or so if you can get it. It was a good bullet and won alot. Now everybody switched to a 300WSM amd shoot 210 Bergers. They seem easier to get to shoot and seem to be more accurate. Matt
     
  15. FatBoy

    FatBoy

    Joined:
    Dec 30, 2004
    Messages:
    1,290
    Consider trying the Berger 230 OTMs if you can find them. It's got a profile much different than the hybrid and works very well in my 10 twist 26" 300wm with Retumbo. I mag load so I have the bullet deep in the case. I only run it at 2800fps but I consider it to be very accurate to 1000 and it does pretty damn good at 1250 as well. Half MOA or better right out of the box with Winchester bulk brass. This in a barrel that wouldn't shoot 208 Hornaday or 220SMKs under MOA at 100y with H1000 or rl22.
     
  16. Zero333

    Zero333 Gold $$ Contributor

    Joined:
    Dec 24, 2015
    Messages:
    1,496
    I shoot 240's in a 300winmag and RL-33, F.C. brass and 215m primers.

    I settled on 76 gr with a velocity of 2,760 fps from a 26" barrel with 10" twist.

    Chamber has a very short throat. Far from ideal for the 240's super long bearing surface, but it shoots great nevertheless !!! CBTO was 2.880" or around 3.453" kissing lands.

    If your chamber has generous freebore, I assume you'll have to up the RL-33's charge weight a little bit compared to mine.

    Here is a pic of the 76 gr group during load development at 220 yards...
    (4 shot groups during load development to save a little barrel life )

    240smk300Win76RL33.jpg
     
    Ksmirk and simo hayha like this.
  17. Ksmirk

    Ksmirk

    Joined:
    Oct 8, 2007
    Messages:
    387
    Well finally got out with some Hornady 225 BTHP over some H4831SC and .020" off the lands, I have to say the rifle really has some potential! I've got a few more bullets to try but I would be happy just going with the results from today honestly, nothing over 1" group granted only 3 rounds each as I was also seeing where pressure would show, here's the better of the bunch. I guess this barrel just didn't like the Berger 215's!

    71.0 2801fps SD 18 ES 36 1"
    71.5 2802fps SD 4 ES 7 7/8"
    72.5 2857fps SD 1.7 ES 3 3/8"-1/2" just a big hole of all 3 rounds, think this one's going in the log
    73.0 2881fps SD 6.5 ES 13 1/2"-5/8" light swipe on brass

    Damn sure don't try these in a factory chamber! this chamber has been throated longer. Soon as I get a few promising loads I'll get a bit more range and test again to see what happens but I'm much happier than I was this time last year. Appreciate the advice fella's and pointers.

    Kirk
     

Share This Page