I give up on Magpro powder, produced patterns but no groups in my rifle. I'm trying to decide on what to try next. I have RL19, IMR 4350, and H4831sc available. I dont have a chrony so I know it's just a guess but what do you all think would give the next best velocities. 270 WSM, 140 gr. Nos. Bal. tips., Win mod. 70 Supershadow. Note: A friend gave me 1/2 can of the RL19, I havent used it before and am a little leary of it from what I have read here about the lot to lot inconsistencies.
24" barrel on Kimber 8400. 7828 works OK but I haven't ended up with it as the best load in a cartridge since RL-22 came out. Also make sure that your loads are concentric i.e. not too much runout, this can make a big difference.......DJ
Posts: 3976 | Location: Oklahoma,USA | Registered: 27 February 2004
Be carefull using IMR 4350 it is tempature sensitive, and pressure will vary from cold to hot weather. Hodgdon 4350 is listed as an extreme tempature powder. For more info on Hodgon Powder look at there website.
I've never had a problem with Re19, 22, 25. Temp sensitive, sure, but it didn't change my groups at all with over a 50 degree temp diff.
I love Reloader powders, IMR, and Hodgdon. But, since you are leary, try the 4831SC or even H1000. I get amazing groups and velocities with 140 B-Tips in my 270WCF with H1000 max load.
This buck was killed with my 270, Re19, 130 triple shock, at 254 yards:
and so was this one:
I worked up the load last August in Ohio with HOT temperatures. When these bucks were killed, it was no warmer than 20-30 degrees early in the mornings. The triple shocks went right on target.
Do you think that primers can make that much differance? I don't have Federal but do have CCI 200 I can try. I don't think seating further off the lands will help as the groups opened more at .030 (unless it was just me, as it's kinda hard to stay focused when your trying to squeeze those shots into a 2" circle)
That is an impressive 200 yrd. group with the RL22. I think RL22 will be powder #2. What is the barrell length on a Kimber 84?
I have also read that some folks are having good luck with IMR7828, and it seems to generate lower pressures. Anyone have any experience with this stuff?
Quote: Be carefull using IMR 4350 it is tempature sensitive, and pressure will vary from cold to hot weather. Hodgdon 4350 is listed as an extreme tempature powder. For more info on Hodgon Powder look at there website.
There is no doubt that some of the IMR powders will produce some pressure/velocity variation due to temperature changes, but, unless these are extreme, such as developing an absolute maximum load at 32 degrees F then shooting it at 100+ degrees, the variation is nothing to get your rompers in a snarl over! I used IMR 4350 in my favorite .270 Win. load for 30 years, using the same load (53.5 grains with the Nosler Partition 150-gran bullet) in Alaska, Arizona, Colorado, New Mexico and Texas with absolutely no problems at all. Needless to say, the temperature variations between these locales is rather noticeable! As a matter of fact, until relatively recently, American reloaders had only Hercules and DuPont (IMR) powders to choose from, and most of us got along pretty well without Norma, VV, etc. etc., for many years!!
Felcher, RE-19 is my go-to powder in my .300 WSM, but, having said that, it doesn't mean it will be THE powder for your .270. But I certainly would try it.....
FWIW.
MKane160 aka BigDogMK
Posts: 488 | Location: TN | Registered: 03 January 2004
Here are the components of my loads: New Win. brass, WLRM primers, Magpro 69.0, 69.5, 70.0, 70.5, 71.0, 71.5, 72.0, 72.5 grs.(bolt got sticky at 72.5), 140 Nos. Bal. tip. Initially I loaded 5 of each of these seated .020 off the lands. The 71.0 and 72.0 showed the most promise so I loaded 10 more of each of these charges. I then tried 5 of each with bullets seated .010 and .030 with no real improvements. I then loaded 5 more of the 72.0 seated to .020 off the lands and then backed the torque off the action screws (which were intitially very tight). End results were still 1.5 to 2 inch groups. This was done over the course of a couple of weeks, sometimes 2 trips per day to the range (early morn. and late evening) and usually would shoot only 5 rounds per trip over the course of an hour or so, (point here is that the barrell was sufficiently cool). Only thing I can figure is my gun just don't have a taste for Magpro.
Felcher: I'll admit I don't have a .270 WSM but I'd heartily advise you to take Steve's advice. I had problems for years getting my .270 Win. to group consistantly. After seeing his recomendation, I now get 1" groups on a very consistant basis and very acceptable standard deviations as well. This with a Ruger, mod. 77. After looking at information on his site, I'd then play with seating depth as measured to the ogive. My experience suggests that next to correct powder, seating depth is the 2nd most important factor in accuracy. This of course assumes correct bench technique. Hope this helps some. Bear in Fairbanks
Posts: 1544 | Location: Fairbanks, Ak., USA | Registered: 16 March 2002
Quote: I give up on Magpro powder, produced patterns but no groups in my rifle. I'm trying to decide on what to try next. I have RL19, IMR 4350, and H4831sc available. I dont have a chrony so I know it's just a guess but what do you all think would give the next best velocities. 270 WSM, 140 gr. Nos. Bal. tips., Win mod. 70 Supershadow.
MAGPRO is the best powder for .270 WSM and a 140 gr bullet, bar none!!! What load are you using?? I put together 70 gr of MAGPRO and 140gr Nosler Accubonds(like a Ballistic Tip only bonded), Winchester Brass and Federal Primers. I'm getting .6" MOA at 100 yards. You should browse on over to Shortmags http://www.shortmags.org and check the forums there. You should probably play with seating depth. It would help to know ALL components of your load, as well as seating depth.
bowhuntrrl
Posts: 931 | Location: Somewhere....... | Registered: 07 October 2002
Quote: Here are the components of my loads: New Win. brass, WLRM primers, Magpro 69.0, 69.5, 70.0, 70.5, 71.0, 71.5, 72.0, 72.5 grs.(bolt got sticky at 72.5), 140 Nos. Bal. tip. Initially I loaded 5 of each of these seated .020 off the lands. The 71.0 and 72.0 showed the most promise so I loaded 10 more of each of these charges. I then tried 5 of each with bullets seated .010 and .030 with no real improvements. I then loaded 5 more of the 72.0 seated to .020 off the lands and then backed the torque off the action screws (which were intitially very tight). End results were still 1.5 to 2 inch groups. This was done over the course of a couple of weeks, sometimes 2 trips per day to the range (early morn. and late evening) and usually would shoot only 5 rounds per trip over the course of an hour or so, (point here is that the barrell was sufficiently cool). Only thing I can figure is my gun just don't have a taste for Magpro.
First of all, I would try a primer change. I'm using Federal Large Rifle(not magnum). Second of all, I would back off the lands to .050, then .040, and finally .030 . I'm getting almost 3200 fps in my gun with 70gr of Magpro. If your best groups were 71 and 72, I'd use those to play with seating depths. Seriously though, try the different primers I suggested. Some on Shortmags are getting 3400 fps with 140 grainers and Magpro. It's a great powder IF you can find a load that your rifle likes.
bowhuntr
Posts: 931 | Location: Somewhere....... | Registered: 07 October 2002
