7x300 weatherby questions

[Wingnut00]

Hey guys I got a buddy that has one of these and here soon he is gonna bring it to me for some load development with Berger 180's. I don't know anything about the gun whatsoever except that he used to shoot 168's and it shot pretty good and also I know from talking to him that fired brass is still 2 thou tight in the neck so I know I will be neck turning which ain't no big deal. I have done searches on here and found some info but really curious about different powders to try and good starting points. Curious about rl33, retumbo, imr7977, h50bmg, and us 869. Also curious about what velocities are obtainable with each. Any and all experience would be appreciated. I'm just tryin to get some ideas for when he brings the rifle to me. Thanks folks

 

[Ggmac]

Start at the lowest 7 mm STW listings . Sorry no coffee yet . I use to shoot this at 1000 in Pennsylvania . I shot h570 , still have 4 pounds .
More when I wake up .
Gary

I never shot 180s , I only shot the 168 gr.
I'd check twist and freebore before I went to such a long bullet .
Does it have the builders Mark , name ?

 

[Wingnut00]

Yep ur advise for twist and freebore is on my list of first to do. All I know is when my buddy got the rifle built he asked his gunsmith to build it around the 168 Berger so other than that I know nothing. I will be learning a lot when I get my hands on it. I really hope to get the 180's to shoot but I don't want em stuffed so far in the case that the base of that long slug is pushin the primer out. Just a little humor. But thank u for the reply and if u think of more after coffee feel free to let me know.

 

[dkhunt14]

Sierra used to have info in their loading guide. I am not sure if the newer ones do. Matt

 

[Wingnut00]

Sierra used to have info in their loading guide. I am not sure if the newer ones do. Matt

Ok thank u for that. I know my newest Sierra book just has a page about it but no data which don't make sense but I got a few buddies that have some older manuals so maybe I could get something there.

 

[Ggmac]

The Sierra book had info on the one load used at the time ( 1973-76 )
All the data was using H 570 , If I remember correctly .
Mary Louise DeVito shot a world record with that load .
The gun she used was built by a smith in Pa. Howard Wolfe , again I'm going from memory , please forgive if not correct , coffe is starting to work .

 

[Wingnut00]

Thanks for the replies guys. Much appreciated and keep em comin.

 

[AckleymanII]

I have that old Sierra Manual, no loading data in it. The article referres to a Handloader Magazine issue #87, Sept-Oct 1980

Good luck

 

[jfseaman]

I checked in QL and 7STW start loads are 7mm/300WM max+ loads.

This is the STW from Hogdgons web site

180 GR. BER VLD
Starting Loads Maximum Loads
Manufacturer Powder Bullet Diam.
C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure
Hodgdon US 869 .284" 3.655" 81.8 2,822 46,200 CUP 87.0 2,988 52,700 CUP
Hodgdon H50BMG .284" 3.655" 80.8 2,772 48,800 CUP 86.0C 2,894 52,400 CUP
Hodgdon Retumbo .284" 3.655" 69.3 2,760 49,700 CUP 73.8 2,876 53,500 CUP
Hodgdon H1000 .284" 3.655" 70.0 2,771 48,800 CUP 74.5 2,892 53,300 CUP
IMR IMR 7977 .284" 3.655" 70.3 2,757 48,800 CUP 74.8 2,901 53,200 CUP
IMR IMR 7828 .284" 3.655" 67.8 2,789 48,200 CUP 72.0 2,920 53,600 CUP
IMR IMR 4955 .284" 3.655" 63.9 2,736 50,300 CUP 68.0 2,849 54,300 CUP

 

[Wingnut00]

I checked in QL and 7STW start loads are 7mm/300WM max+ loads.

This is the STW from Hogdgons web site

180 GR. BER VLD
Starting Loads Maximum Loads
Manufacturer Powder Bullet Diam.
C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure
Hodgdon US 869 .284" 3.655" 81.8 2,822 46,200 CUP 87.0 2,988 52,700 CUP
Hodgdon H50BMG .284" 3.655" 80.8 2,772 48,800 CUP 86.0C 2,894 52,400 CUP
Hodgdon Retumbo .284" 3.655" 69.3 2,760 49,700 CUP 73.8 2,876 53,500 CUP
Hodgdon H1000 .284" 3.655" 70.0 2,771 48,800 CUP 74.5 2,892 53,300 CUP
IMR IMR 7977 .284" 3.655" 70.3 2,757 48,800 CUP 74.8 2,901 53,200 CUP
IMR IMR 7828 .284" 3.655" 67.8 2,789 48,200 CUP 72.0 2,920 53,600 CUP
IMR IMR 4955 .284" 3.655" 63.9 2,736 50,300 CUP 68.0 2,849 54,300 CUP

Awesome. Thank you for your time looking up that data. Very much appreciated.

 

[tgoss]

reloader 25 works good. I shoot 168 Barnes LRX. Gun has a lot of free ore and 3.6 box. Jumping almost .400 but will shoot sub .3. 80 grs will get 3270 out of 26 inch Hart 1:9.

 

[kendoka66]

reloader 25 works good. I shoot 168 Barnes LRX. Gun has a lot of free ore and 3.6 box. Jumping almost .400 but will shoot sub .3. 80 grs will get 3270 out of 26 inch Hart 1:9.

I have a thread on 7x300 Weatherby ,check it out. I enjoy shooting it ,Try rl33 or US869 or H870 if you can find any. I have used all of the heavy bullets in my loads.