7 STW and Winchester WMR powder

[victor3ranger]

I am about to fall into the 7STW hole soon and I figured I better start asking some questions.
Has anyone here used Winchester WMR powder in their 7STW?
If so how good did it work?
I know that there is probably better powder out there but I am curious about this one since I have a bunch

 

[MagnumManiac]

I will look up my info from years ago and let you know ASAP.
I was always surprised how well this powder shoots.

Cheers.

 

[VinceMule]

In my 7 STW's, I shot 120g Barnes TTSX and ballistic tips at 3850 fps using R#22 and IMR 7828 with Win brass and Fed 215's. 140g Nosler combined Technology bullets were shot at 3650 fps into very tiny groups with IMR 7828. BIG Deer were dead in their tracks on bullet impact out to 550 yards.

I would love to hear your experience with the WMR powder.

 

[ButterBean]

Never tried it or knew of anyone that did, RL22 and at the time "new " RL25 with the 140's was the ticket

 

[baldhunter]

There is very little data out there for the Winchester WMR.It looks like it's kinda fast burning for the 7STW.It looks like it's close the the burnrate for IMR4831,Hunter,Reloader19.Probably works a little better with light weight bullets.I shoot the slower burnrate Winchester WXR in mine that has a burnrate like Reloader22.Here is some load data to help you figure out about the range of powder charge you might use for different bullet weights.As always,work up your loads.Every rifle is different. https://stevespages.com/284_6_175.html

 

[Gary in MD]

I have an 8 pounder of the WMR, I haven't used it much over the years. Hornady lists loads for the STW, I think they are one of the only manuals that I've seen data for that powder. When listed, it is usually listed for heavy bullets for that cartridge. It seems to me that it is very close to RL22 & H4831 in burn rate. I didn't use it in my 7mm STW, I always got great accuracy using RL22 & IMR 7828.
With that said, I'd be surprised if you couldn't work up some acceptable loads with it in the STW.
Try it and keep us posted.

 

[DarryH]

Curious what gun you chose? Where I work, we have a Weatherby MKV in that caliber. It has been making me think about it for myself. Right off I can't recall what scope is on it, I just remember it was a good one. I'll have to look when I work again.

 

[Bghunter338]

Curious what gun you chose? Where I work, we have a Weatherby MKV in that caliber. It has been making me think about it for myself. Right off I can't recall what scope is on it, I just remember it was a good one. I'll have to look when I work again.

Buy it, it's my favorite round. I have 2 of them now. This is from my newest one. Give you an example of what there capable of.

 

[victor3ranger]

I have an 8 pounder of the WMR, I haven't used it much over the years. Hornady lists loads for the STW, I think they are one of the only manuals that I've seen data for that powder. When listed, it is usually listed for heavy bullets for that cartridge. It seems to me that it is very close to RL22 & H4831 in burn rate. I didn't use it in my 7mm STW, I always got great accuracy using RL22 & IMR 7828.
With that said, I'd be surprised if you couldn't work up some acceptable loads with it in the STW.
Try it and keep us posted.

Someone steered me to the Hornady manual with the load data so I ordered the manual and it has good information in it.

 

[victor3ranger]

Curious what gun you chose? Where I work, we have a Weatherby MKV in that caliber. It has been making me think about it for myself. Right off I can't recall what scope is on it, I just remember it was a good one. I'll have to look when I work again.

Alright Darry, where do ya work and how much for the weatherby
I am having shortgrass put a new barrel on my old rem 700 7RM and he is going to chamber it in 7STW

 

[victor3ranger]

Buy it, it's my favorite round. I have 2 of them now. This is from my newest one. Give you an example of what there capable of.

View attachment 483824View attachment 483825View attachment 483826

Dear Lord that looks like a tank killer round

If all this works out I am going to rename my rifle from "ugly Betty " to "Creedmoor killer "

 

[victor3ranger]

I did start going through the brass I had found yesterday and I was very disappointed, so far half of them are no good, cracked necks, messed up shoulders and bent necks

 

[victor3ranger]

I have 100 rounds of loaded 8mm Rem Mag with all its load data, I guess I am going to have to start pulling bullets, annealing and sizing down the necks just to get started

 

[tallgrass ranch]

I've had the 7stw since 96 , the man who built the gun earlier used 8mm cases , I still have a box or two of .
Rem 700 24" Douglas 150 NP over 80.5 /h-1000 @ 3316 & .93 moa . Western Oklahoma plains !!!