Originally Posted by memyselfni
I am using 59 grains of 2209 , which is equivalent to H4350, the adi powders are the most easily available over here, and i am going by the ADI Manual, i am one grain over the max allready giving me just on 3000 ft/s on my chrony with a 140gr accubond and ssts with consistant MOA 3 shot accuracy at 100 yards. I also have a tin on ADI 2225, which is supposed to be the equivilant of retumbo and RL 25,how will this powder perform? how fast should i be able to drive a 150 grain bullet out of this rifle? also, i have a leupold vxIII 2.5-8x36 on this rifle because i do a lot of walking up mountains, do you think i will be able to 'click up' for distances to say 500 yards? will i have enough energy out there? (My longest shot so far was some feral turkeys with it at 300 yards),
I live in Australia,and I think I can help you out,AR 2225 IS Retumbo,that's what it's sold as in the US.AR 2217 IS H1000,same as before.I believe this is the slowest powder you should be using in your 270WSM.(I have a 270 Weatherby) and I heed my own advice!
AR 2225 is WAY too slow for your case capacity!
You should be able to get just shy of 3100fps with 150gr bullets.
Try a load of AR 2217 with a start load of 71gr-max load of 73gr with 130 gr bullets.
AR 2217 start load of 66gr-max load of 70gr with 140gr bullets.
AR 2217 start load of 64gr-max load of 67.5gr with 150gr bullets.
If Reloader 25 is available in New Zealand,I would also give it a try.
The charge weights above for AR 2217 can be used for Reloader 25 with no problems,as long as you work up from below max by no more than 5%.
Now if you have a long throat you MAY be able to increase your loads until you get high pressure signs;ejector marks on case head,flattened primers,blown primers,sticky bolt lift(this may be NORMAL in WSM rifles) and larger than normal expansion of case body just ahead of the extraction groove.This symptom will most likely appear when you full length size your cases(recommended for WSM brass).
The above loads can be found in Nick Harveys' Practical Reloading Manual,I'm sure it's available in New Zealand,this one is the 8th edition.
The size and magnification of your scope really plays no part in your ability to shoot at longer ranges.You need to sight your rifle for it's maximum point blank range (MPBR).This varies with each load and bullet weight,but if you want to take shots at 500 yds you will generally need to sight in 3"-3.5" high at 100 yds to have a drop of no more than 12"-16" at 500 yds.which negates a backline hold on Reds and Sika.
Harveys manual can give you the MPBR for your rifle,it's in the back of the book!
Keep increasing your loads until you get signs of high pressure,then back off a few grains.