300 WSM comparsion - 24hourcampfire

Worked up a load in my 300 WSM. ( 24" bbl ) 66grs Win 760/H414 & the Hornady 165gr BTSP. CCI #200 LR primer, Win brass.Over my chrono 3150 fps. Got my loading info from Nosler . They of course were using a Nosler bullet. Their max load was 66.5grs Win 760. Load worked out great with consistently pleasing accuracy. Just wanted to do some comparison with others out there who might have similar results.

Originally Posted by Hesp

Worked up a load in my 300 WSM. ( 24" bbl ) 66grs Win 760/H414 & the Hornady 165gr BTSP. CCI #200 LR primer, Win brass.Over my chrono 3150 fps. Got my loading info from Nosler . They of course were using a Nosler bullet. Their max load was 66.5grs Win 760. Load worked out great with consistently pleasing accuracy. Just wanted to do some comparison with others out there who might have similar results.

Why didnt you use the hornady manual?

The reason I didn't use the Hornady manual is that I sold my place here & am in the middle of moving. All my loading manuals were packed except for Nosler. Guess I could have looked on line but had limited time to load & shoot. The load work out wonderfully though.

Hornady with 165gr bullet. The max with 414 is 66.9 and their max with 760 69.1. Which makes no sense considering they are the same powder.

Will add nosler always been on the conservative side. But if i remember right the partition will show pressure long before a interlock bullet, so that’s probably why.

It is true the partition will create more pressure than a bullet with no partition. Also strange to see such differences in loads listed by Hornady since Win 760 & H-414 are the same powder just with a different label. I assume it could be a difference in lot productions which shows why it is important to work up any load you have if you acquired with a different lot # of the same powder.

MD verified what I was using for years....the Hornady bullets shoot right with the Barnes, they are a good bullet for cheaper practice, etc. I've also used Sierras (Pro Hunters) for that too. Did you trade in that .270 EW for the 300 WSM? ha

Originally Posted by 79S

Will add nosler always been on the conservative side. But if i remember right the partition will show pressure long before a interlock bullet, so that’s probably why.

Would you be willing to clarify this statement ?
Nosler list 3092 FPS with RL17 and a 180 gr bullet .
Hardly conservative.

3150fps is what I was getting with 65.0grs of 760 and a 165gr Hornady Interbond.I just ran 20 fire lapping bullets down the bore to give me a touch more free bore because my rifle could never shoot anything close to book max without getting pressure signs.After shooting those lapping bullets,the velocity did drop a 100fps on my loads,so I'm thinking now that I'm going to have to bump my loads up a grain or two.I noticed the same thing with the Hornady manual.There loads are kinda all over the place.I too saw the same thing on their H414 and 760 loads.They are the same powder just different lots.If you look at Hodgden,they show the same data http://www.hodgdonreloading.com/data/rifle
760 was the one powder that gave me the best accuracy and velocity in my rifle.Reloader 17 was the highest,but it wasn't as accurate.Reloader 22 was very accurate but the velocity was a bit lower.A lot of powders will work well in the 300WSM,it's kinda like the 30-06,just some may be a lot better than others.I haven't tried Reloader 16 in it yet,but that powder has given me good results in a 30-06 I was loading it in and I think it will be a good powder for the 300WSM.

Originally Posted by baldhunter

3150fps is what I was getting with 65.0grs of 760 and a 165gr Hornady Interbond.I just ran 20 fire lapping bullets down the bore to give me a touch more free bore because my rifle could never shoot anything close to book max without getting pressure signs.After shooting those lapping bullets,the velocity did drop a 100fps on my loads,so I'm thinking now that I'm going to have to bump my loads up a grain or two.I noticed the same thing with the Hornady manual.There loads are kinda all over the place.I too saw the same thing on their H414 and 760 loads.They are the same powder just different lots.If you look at Hodgden,they show the same data http://www.hodgdonreloading.com/data/rifle
760 was the one powder that gave me the best accuracy and velocity in my rifle.Reloader 17 was the highest,but it wasn't as accurate.Reloader 22 was very accurate but the velocity was a bit lower.A lot of powders will work well in the 300WSM,it's kinda like the 30-06,just some may be a lot better than others.I haven't tried Reloader 16 in it yet,but that powder has given me good results in a 30-06 I was loading it in and I think it will be a good powder for the 300WSM.

Are you referring to powder charge or velocity when you refer to book max ?
I don’t believe you can speak of them interchangeably.
I’ve always used velocity. It will take more or less powder to achieve this velocity depending on your barrel or even the condition of that barrel.

3150 FPS with a 165 on the upper end .

What have you guys shooting the 180 AccuBond found the upper velocity to be with H4350 and RL17 ?

Originally Posted by Stilllearning

Originally Posted by baldhunter

3150fps is what I was getting with 65.0grs of 760 and a 165gr Hornady Interbond.I just ran 20 fire lapping bullets down the bore to give me a touch more free bore because my rifle could never shoot anything close to book max without getting pressure signs.After shooting those lapping bullets,the velocity did drop a 100fps on my loads,so I'm thinking now that I'm going to have to bump my loads up a grain or two.I noticed the same thing with the Hornady manual.There loads are kinda all over the place.I too saw the same thing on their H414 and 760 loads.They are the same powder just different lots.If you look at Hodgden,they show the same data http://www.hodgdonreloading.com/data/rifle
760 was the one powder that gave me the best accuracy and velocity in my rifle.Reloader 17 was the highest,but it wasn't as accurate.Reloader 22 was very accurate but the velocity was a bit lower.A lot of powders will work well in the 300WSM,it's kinda like the 30-06,just some may be a lot better than others.I haven't tried Reloader 16 in it yet,but that powder has given me good results in a 30-06 I was loading it in and I think it will be a good powder for the 300WSM.

Are you referring to powder charge or velocity when you refer to book max ?
I don’t believe you can speak of them interchangeably.
I’ve always used velocity. It will take more or less powder to achieve this velocity depending on your barrel or even the condition of that barrel.

3150 FPS with a 165 on the upper end .

I had to use the help of my chronograph to tell me when I should quit even if I didn't see pressure signs with some powders.Most of the time I'd be getting a tight bolt lift a few grains below reaching book max.There was no way I could load book max loads in my rifle.After fire lapping,I knew the velocity of my loads,the velocity dropped about a 100fps.I was starting to get a little erosion on my throat so it not only cleaned that up a little,it also gave me a little freebore that my rifle never had that was why loads listed in the manuals where always too hot for my rifle.180gr data max loads were about perfect max for my 165gr loads.Now I'm sure the 165gr data will now work for 165gr bullets in my rifle.

Originally Posted by Stilllearning

Originally Posted by 79S

Will add nosler always been on the conservative side. But if i remember right the partition will show pressure long before a interlock bullet, so that’s probably why.

Would you be willing to clarify this statement ?
Nosler list 3092 FPS with RL17 and a 180 gr bullet .
Hardly conservative.

Yep all day long, and I have never came anywhere near what nosler list for velocity as well..

Originally Posted by baldhunter

I had to use the help of my chronograph to tell me when I should quit even if I didn't see pressure signs with some powders.Most of the time I'd be getting a tight bolt lift a few grains below reaching book max.There was no way I could load book max loads in my rifle.After fire lapping,I knew the velocity of my loads,the velocity dropped about a 100fps.I was starting to get a little erosion on my throat so it not only cleaned that up a little,it also gave me a little freebore that my rifle never had that was why loads listed in the manuals where always too hot for my rifle.180gr data max loads were about perfect max for my 165gr loads.Now I'm sure the 165gr data will now work for 165gr bullets in my rifle.

I had the same problem with one of my 300WSM rifles. It had a tight chamber and I'd get a stiff bolt lift with 66gr of H4350 and the 165gr hornady interlock. I backed off to 65gr and that was the sweet spot for accuracy as well. What really sucked was I was only running 2,900 fps. with that load. Not that I'm complaining though, as it was very accurate out to over 600 yards. I shot one of my furthest bucks with that rifle and load at a LR'd distance of 600 yards on the nose. Every rifle is its own entity. Some rifles reach their "max" before the books suggest. The only thing you can do is switch to a different powder and see if you can get closer to the stated max velocity without getting obvious pressure signs, such as stiff bolt lift.. I always heard RL17 was made for the 300WSM and you can get excellent accuracy and higher velocity than H4350. I've never used it, but it is definitely on the list of powders to get for the new 300WSM...

I was able to try R17/168 TTSX a few days ago. It worked out especially well as I wanted to try it in temps over 80 deg. ( I had tried R17 in a couple other cartridges that did swell in cold temps) It was 83 deg, and I was only using 3 shot groups ( I always do then I shoot more if a load has promise first) anyhow, this Kimber has a tight chamber too, 64gr was very accurate. easy extraction ( if that means much) went into.40". 65gr, also easy bolt lift, went into a nice, rounded .75". I will chrono them later. Anyhow, R17 proved ( to me at least) every bit as good as H4350 for the temp issue. I'm very pleased, to say the least! I'm settling on the 168 TTSX for this rifle now.

Finally got to chronograph my loads today. The 300 WSM/ R17 64gr/168 TTSX is going 3167fps and it repeated its accuracy. I'm impressed! My 300 WinMag/R23 73gr/175 LRX is going 3081fps, also repeated its accuracy. My 270/R16 53.6gr/129 LRX did not. I went on up to 54.5 and it clocked 3160fps, but 4 shots went into 1 1/2". I'm going to seat them a tad deeper and try 54.5 to 55.5 in increments, see what happens.

Here you go.

I believe SAAMI standards are closer to 65K PSI for the WSM:

Code

Cartridge          : .300 WSM (CIP)
Bullet             : .308, 165, Hornady BTSP 3045
Useable Case Capaci: 74.129 grain H2O = 4.813 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Hodgdon H414

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.735% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-07.4   87    63.00   2894    3068   48625  10678     97.4    1.246
-06.6   88    63.50   2916    3115   49780  10753     97.6    1.232
-05.9   89    64.00   2938    3163   50963  10826     97.9    1.219
-05.1   89    64.50   2960    3211   52173  10896     98.1    1.206
-04.4   90    65.00   2983    3259   53412  10965     98.3    1.193
-03.7   91    65.50   3005    3308   54680  11031     98.5    1.180  ! Near Maximum !
-02.9   91    66.00   3027    3356   55978  11095     98.7    1.168  ! Near Maximum !
-02.2   92    66.50   3049    3405   57307  11156     98.9    1.156  ! Near Maximum !
-01.5   93    67.00   3071    3455   58668  11215     99.0    1.143  ! Near Maximum !
-00.7   93    67.50   3093    3504   60061  11271     99.2    1.131  ! Near Maximum !
+00.0   94    68.00   3115    3554   61487  11325     99.3    1.119  ! Near Maximum !
+00.7   95    68.50   3136    3604   62948  11377     99.5    1.108  ! Near Maximum !
+01.5   95    69.00   3158    3654   64444  11426     99.6    1.096  !DANGEROUS LOAD-DO NOT USE!
+02.2   96    69.50   3180    3705   65977  11472     99.7    1.085  !DANGEROUS LOAD-DO NOT USE!
+02.9   97    70.00   3202    3755   67546  11516     99.8    1.073  !DANGEROUS LOAD-DO NOT USE!
+03.7   98    70.50   3223    3806   69155  11557     99.8    1.062  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba     94    68.00   3159    3656   65014  11248     99.9    1.093  !DANGEROUS LOAD-DO NOT USE!

I worked up loads with H414, 760, 785 in 300 WSM. All of them were initially perfect. Subsequent range trips proved to be disappointments. The dependable, repeatable accuracy was too sporadic. JB warned me of that & he was sure correct. Got no tolerance for sometimes things.

Wound up settling on H4350 for 165’s & VV N550 for 155’s. Fully reliable on race day.

Was able to shoot my 300WSM the other day after I ran the 20 fire lapping bullets.Prior to lapping I was getting 3080fps with 64.5grs of Win 760 and 3137fps with 65.0grs of Win 760 with a 168gr Nosler Ballistic Tip.After lapping,using the same bullet and powder,66.0grs 3113fps and 66.5grs 3167fps.The 168gr bullet is just a little longer and I see about 20-30fps slower velocity than I get from the 165gr using the same load.