WMR Powder - Question?

[the_spotdoctor]

Have a question concerning this powder. I know this powder was introduced in 1994, and has since been discontinued. I know it is mainly for 7 MM Rem MAG and 300 Win Mag and 338 mag. Does anyone have any loads for say 140 gr. 150 or 175 grain bullets in 7mm mag, or will it work in some other rounds. Got a good deal on a couple of lbs. of powder. Okay $20 for two lbs , and it was sealed in a climate controlled gun shop. I would mainly like to use it in a 7mag or anything else that it would be good to load with. Thanks in advance.

[BBF]

The best I can do is look at the burning rate. WMR is between IMR 4831 and XMR-3100 which are slightly faster and H-4831SC and H-4831 which are slighty slower.

[Siskiyou]

It is one of my favorite powders.  I am still P.O. at WW for dropping it. 

Hornady Manual #7 which is still on the store Shelves has a number of loads listed in a variety of cartridges.  The Hornady manual list 7 Rem. Mag. loads from 120-grain up to and including 175.

I have had good results loading 140-grain, 270 Winchester loads with it.  Best group was approximately 3/8" at 100-yards. 

It is an easy powder to work with. 

Like a good wine I have reserved my supply for the .270, but if I had a larger supply the 7 Mag would be a round of choice.

It would be a top of the list powder for the .243 Winchester.

WMR was a favorite powder for the guys shooting 6.5-284 rifles a 1000-yards.  I did a bunch of research for my brother who had a 6.5-284 built.  His only disappointment is having to look for another powder.
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=438424

[the_spotdoctor]

Thanks for the info. I found a little I know you load from 57.2 up to 70.3 grains, I can try a few loads close to max. I will be shooting it in a Remington Sendero 7mm Mag, I have two good loads already for it. 64 grains of Imr 4831 and 63 grains of Imr 4350 behind 140 grain sierra bullet, I can shoot a .5 inch group with either. If it is better than those two, it will be making a one hole group about as big as a dime. I have a Remington 788 in 243 that will shoot a dime size group with 42 grs. of imr 4350 behind a hornady 100 gr bullet, it is the most accurate gun I own, shoots better than the $1000 sendero and bought it at a gun show for 250. I had one long time ago and sold it, found this one last year and bought another , this one shoots better than the old one i Had. Sorry for rambling on, but just started thinking of things.

[blpenn66502]

Here's a link that has 7mm Mag data for WMR:  http://stevespages.com/page8c.htm

[Siskiyou]

I sent you an e-mail with the Winchester DATA sheet.  No 7 Mag on it.

I have regulated my M788 in .243 to coyote hunting.  I have used bulk WW 80-grain soft points in it pushed by H414.  The rifle has a history of accuracy with 80-grain bullets along with 100, and 105 grain bullets.  The burden of owning a M788.

The temptation has been strong to try the 80-grain bullet on deer because that is what the rifle is sighted in with.  The downside is that I do not trust the Winchester 80-grain on deer.  I do not want one bad enough to create cripples.  I bought 4 boxes of Federal blue box 100-grain ammunition.  I hope that at 100-yards it will shoot with the 80-grain bullets so I do not need to change the sights.

To repeat my earlier post I had load development with WMR and the .270 and was very pleased with the results.  The published Hornady data is a little hotter then the Winchester data.  I also did a little loaded development with WMR in the 6.5x55.  The results were very promising but I lost good daylight and my Chrony did not record the last series of shots.  Earlier that day I had fired a number of 6.5 loads using H4831 and met my goals.  I decided to discontinue the work with the 6.5 Swede because I wanted to reserve the remaining WMR for the .270.

I suspect that similar results can be achieved with the new Winchester 780 Supreme powder, but I stepped back when I checked the price.

[charles p]

Probably a might too fast for 7mm Rem powder volumes.

[the_spotdoctor]

Thanks very much for the info and the pages you sent Siskiyou.