7x300 weatherby magnum

[Ggmac]

Joe , it sounds like a twin to mine !

 

[Joe Salt]

Ggmac It belonged to one of my buddys, he needed the money so I have it. But It was built in like 1971. I also have the Die's for it. Oh the stock was made by Bill Miller.

Joe Salt

 

[wboggs]

No one has mentioned RL-50 or 7828 ssc I own a 7-300 that is one of the Originals from the Williamsport Club! One of these days I'll try it. Its a 1-9 twist Hart barrel in a block Chambered by Howard Wolfe with an FN single shot action. Just thought I'd add a couple more powders.

Joe Salt

Thanks, Matt. Will go to the site. What a historic shooting area. Bill

 

[kendoka66]

I will update my testing with my 7x300 Weatherby.

H870 90.0gr. 175 Nosler ABLR, Mv. 3160 fps.
Rl 33 88.0gr. same bullet Mv.3100 fps.
us869 92.0gr. same bullet Mv. 3100 fps.
Rl26 78.0gr. same bullet Mv. 3065 fps.
Rl25 80.0 same bullet Mv. 3060 fps.
My c.o.a.l. is 3.808" all of the above loads shoot m.o.a. or less at 300 yards. My long range testing at 800 and 875 yards have been outstanding , 6 inch groups are the norm.

 

[kendoka66]

I will update my testing with my 7x300 Weatherby.

H870 90.0gr. 175 Nosler ABLR, Mv. 3160 fps.
Rl 33 88.0gr. same bullet Mv.3100 fps.
us869 92.0gr. same bullet Mv. 3100 fps.
Rl26 78.0gr. same bullet Mv. 3065 fps.
Rl25 80.0 same bullet Mv. 3060 fps.
My c.o.a.l. is 3.808" all of the above loads shoot m.o.a. or less at 300 yards. My long range testing at 800 and 875 yards have been outstanding , 6 inch groups are the norm.

This barrel is the heavy varmint contour with a 9.250" twist and is 26" long.
I ordered a Bartlien SS barrel same counter with a 1 /8 twist and the length is 29" long with 5r rifling. I think I will be able to get about 75 to 100 fps.
The loads I listed are max. so be very careful when working up loads. I am using the 28 Nosler data.

 

[zorak]

I have a 7/300wby as well that I just rebuilt. I broke my barrel in with some 162gr hornady match hpbt bullets with 76.5gr of IMR 7977 powder. It grouped 9/16" at 100yrds and all my shot were real constant. Now I'm gonna work some.new hunting loads as well. My gunsmith and his dad both have the same caliber and one is using 82gr of retumbo with 180gr VLD and his dad is using 80gr of retumbo with 180gr VLD's at 3110fps and 75gr of Rl-25 with Barnes 168gr LRX's at 3140fps. I had played with 7828ssc and is seem to shoot good out of my old barrel and it was a garbage barrel.

 

[kendoka66]

I have a 7/300wby as well that I just rebuilt. I broke my barrel in with some 162gr hornady match hpbt bullets with 76.5gr of IMR 7977 powder. It grouped 9/16" at 100yrds and all my shot were real constant. Now I'm gonna work some.new hunting loads as well. My gunsmith and his dad both have the same caliber and one is using 82gr of retumbo with 180gr VLD and his dad is using 80gr of retumbo with 180gr VLD's at 3110fps and 75gr of Rl-25 with Barnes 168gr LRX's at 3140fps. I had played with 7828ssc and is seem to shoot good out of my old barrel and it was a garbage barrel.

What c.o.a.l. are you using?

 

[DanConzo]

What c.o.a.l. are you using?

I still use one for hunting - FN Mauser singleshot bench action, old Hart barrel, w/ aluminum barrel block, Bishop bench stock, chambered by Howard Wolfe. My brother has one about the same thing We shoot the 168 and 175 Sierra Matchkings w/ 73 and 73.5 grs H4831 powder, Wby brass necked down, Fed 215 primers. Both rifles are very accurate a long way out. Both rifles have 9" twists.

What c.o.a.l. are you using?

73.5 H4831 w/ Wby brass, Fed 215 primer, 175 gr Sierra Matchking seated just touching lands in 9" twist barrel is real accurate. Velocity about 3180 fps in a 30" barrel.

 

[zorak]

What c.o.a.l. are you using?

With my Barnes lrx's I'm at 3.670 and with my Hornady 162 martch bullets wich were my break in rounds I was at 3.675. So I'm guessing the ogive is different between the 2.

 

[zorak]

I still use one for hunting - FN Mauser singleshot bench action, old Hart barrel, w/ aluminum barrel block, Bishop bench stock, chambered by Howard Wolfe. My brother has one about the same thing We shoot the 168 and 175 Sierra Matchkings w/ 73 and 73.5 grs H4831 powder, Wby brass necked down, Fed 215 primers. Both rifles are very accurate a long way out. Both rifles have 9" twists.

73.5 H4831 w/ Wby brass, Fed 215 primer, 175 gr Sierra Matchking seated just touching lands in 9" twist barrel is real accurate. Velocity about 3180 fps in a 30" barrel.

What is your C.O.A.L? Have you tried using retumbo, 7828 or RL25 in it? My gunsmith has this same round and he's 82grs of retumbo with 180hr VLD's.

 

[DanConzo]

What is your C.O.A.L? Have you tried using retumbo, 7828 or RL25 in it? My gunsmith has this same round and he's 82grs of retumbo with 180hr VLD's.

I use a single shot, no freebore, I load one at a time I don't mess with overall length and have to worry about feeding problems. I seat the bullet just touching the lands. I used R25 and 7828. I've never had any luck w/ either, but H4831 is the berries. I use it on all 300 Wby based cartridges, long and short cut.

 

[kendoka66]

I use a single shot, no freebore, I load one at a time I don't mess with overall length and have to worry about feeding problems. I seat the bullet just touching the lands. I used R25 and 7828. I've never had any luck w/ either, but H4831 is the berries. I use it on all 300 Wby based cartridges, long and short cut.

I have never tried H4831 powder in either one of my 7x300 wby,s. But I load a few up to see if they work out for me. The 162gr. HornadyELD X bullet has been outstanding so far,it has a BC of613. I going to try it at long range 875 yards.
My gunsmith told me about a special collet die made by Inovative Technologies , when you have stretched cases at the belt this collet die work great. My cases had stretched to .513" plus after using the die they measure .509".

 

[kendoka66]

I have been using Weatherby and Norma ,Nosler brass but was not satisfied on case web stretching . I sectioned each brand and measured the web areas I found that Weatherby and Norma are about the same Nosler was a little heavier and had a thicker web. I bought Hornady 300H&H brass And found that was about 8 grains heaver so I cut and sectioned one case and the web was really a lot stronger and extended above the belt ,I shot them with no expansion at all. I am going to use Hornady brass from now on The only down side is I have to Fireform and prep all of the cases.

 

[kendoka66]

I use a single shot, no freebore, I load one at a time I don't mess with overall length and have to worry about feeding problems. I seat the bullet just touching the lands. I used R25 and 7828. I've never had any luck w/ either, but H4831 is the berries. I use it on all 300 Wby based cartridges, long and short cut.

I tried your load of 73.0 gr of H4831 and the 175 Nosler ABLR ,it shot well 5 shots .75 at 100 yds. I will increase the load up to 74.0 and see how it does. no pressure was noted my m.v. was 2934 fps. in my 26" factory Rem. barrel with a twist of 9.250" thanks for sharing.

 

[ebb]

If H870 works then maybe WC 872 would work also, and its cheap.

 

[drags]

WC 872 will work but the lot I had was slightly slower than h870 and the velocity was lower in the 7x300 wby and 300 wby with the same powder charge.
Drags

 

[kendoka66]

WC 872 will work but the lot I had was slightly slower than h870 and the velocity was lower in the 7x300 wby and 300 wby with the same powder charge.
Drags

WC 872 will work but the lot I had was slightly slower than h870 and the velocity was lower in the 7x300 wby and 300 wby with the same powder charge.
Drags

Who makes WC872?, what speed did you get with it? how was the accuracy.

 

[drags]

WC872 is a surplus powder and you should be able to find it where surplus powder is sold.
In my 300 wby a max load with WC872 was about 100 fps slower in my rifle than h870 but the accuracy was slightly better with the WC872, in the 7x300 wby it was a little bit slower but I don't remember how much. It is a good powder and compares favorably with h870 and the price is right.
Drags

 

[kendoka66]

WC872 is a surplus powder and you should be able to find it where surplus powder is sold.
In my 300 wby a max load with WC872 was about 100 fps slower in my rifle than h870 but the accuracy was slightly better with the WC872, in the 7x300 wby it was a little bit slower but I don't remember how much. It is a good powder and compares favorably with h870 and the price is right.
Drags

 

[kendoka66]

Just finished my load development in the new 29" Bartlien barrel with 1/8 twist. Here are some loads that work well.
US869 87.5 gr. 195 Berger 3,143, Hornady brass with CCI 250 primer. c.o,a.l was
3.868".
H870 87.5grs. 180 VLD, same primer and brass, Mv was 3,250, c.o.a.l. 3.800
RL33 85.0 grs. same primer Norma brass 180 VLD,
,3187, C.o.a.l. 3.840.
I am going up with the 180 and 195 and with Hornady 300 H&H brass which is much stronger. I have tried Magnun and RL26, IMR7977 with good results.