All
Just back from Oklahoma where I broke in my new 338RUM. I used some 'pull-push' loads and shot very well. I used the Remington factory 'hunting' load of 250 Core-Lokt, pulled the factory bullet and replaced it with the 250 Sierra GameKing (I didn't have any 250 MatchKings). The BC on the 250 Core-Lokt bullet should be about .420 according to my 'back-figured' BC. The Sierra 250 GameKing has a BC of .570 or there-about. I checked the bearing surface and diameter and felt safe with the 'pull-push' load.
The factory Remingtons have 90.0 grains of some powder and I get 2903 from the 250 GameKing. There seems to be some room for improvement in the velocity arena and the case was not nearly at 100% load density.
BTW, I used 4 rounds for velocity checks to get a ballistics chart (41 yards into a backstop on the scope installation day). I then drove to Oklahoma and used three rounds for the 100 yards zero. My next round was at 900 yards on a 19 x 36 silhouette from SWAG (guessed) data (2/3 the normal 308 come-ups) as I had left my ballistics sheet in the room. I had a miss, high, came down 2 MOA for a center mass hit (21 MOA). My next round was a POA/POI hit at 1000 yards with a 3 MOA come-up.
I fired an additional 10 rounds to get the short range data, backing down from 700 to 200. I played a little on the shorty (19x18) targets at 400 and 500 yards.
George Gardner was there with his 338 Lapua Mag, it's a good deal 'bigger' than the 338RUM. He was shooting 300 grain MatchKings at just over 2900 fps and hitting the steel pretty hard.
Now.... I need to get serious and load some proper bullets. I know I won't get 338 Lapua Mag speeds but I need to reload some decent rounds for 'plinking'.
Who has some load data with 250's or 300's and Reloader 25 or other appropriate powder?
Thanks
Just back from Oklahoma where I broke in my new 338RUM. I used some 'pull-push' loads and shot very well. I used the Remington factory 'hunting' load of 250 Core-Lokt, pulled the factory bullet and replaced it with the 250 Sierra GameKing (I didn't have any 250 MatchKings). The BC on the 250 Core-Lokt bullet should be about .420 according to my 'back-figured' BC. The Sierra 250 GameKing has a BC of .570 or there-about. I checked the bearing surface and diameter and felt safe with the 'pull-push' load.
The factory Remingtons have 90.0 grains of some powder and I get 2903 from the 250 GameKing. There seems to be some room for improvement in the velocity arena and the case was not nearly at 100% load density.
BTW, I used 4 rounds for velocity checks to get a ballistics chart (41 yards into a backstop on the scope installation day). I then drove to Oklahoma and used three rounds for the 100 yards zero. My next round was at 900 yards on a 19 x 36 silhouette from SWAG (guessed) data (2/3 the normal 308 come-ups) as I had left my ballistics sheet in the room. I had a miss, high, came down 2 MOA for a center mass hit (21 MOA). My next round was a POA/POI hit at 1000 yards with a 3 MOA come-up.
I fired an additional 10 rounds to get the short range data, backing down from 700 to 200. I played a little on the shorty (19x18) targets at 400 and 500 yards.
George Gardner was there with his 338 Lapua Mag, it's a good deal 'bigger' than the 338RUM. He was shooting 300 grain MatchKings at just over 2900 fps and hitting the steel pretty hard.
Now.... I need to get serious and load some proper bullets. I know I won't get 338 Lapua Mag speeds but I need to reload some decent rounds for 'plinking'.
Who has some load data with 250's or 300's and Reloader 25 or other appropriate powder?
Thanks