Just received a new rifle in .300WSM, Borden Alpine Action, Rock Creek 5R, #3 barrel, H-S Precision stock. Total weight 8.75 lbs. This is my walking longrange hunting rifle.
I am heading to WY for elk this season. I need to develop a load by mid Sept. My preference is to shoot 180gr Accubonds or TSX at a speed of 3,000 fps.
I'm just starting out with load development. The tightest consistent group I currently have is .56" using MRP-69.0gr & 180 A-Max moly coated (right at 3,000fps). The only other powder I've tried is H4350 and I think the MRP shows more promise at this time. Oh & primers used were BR2, 210M & 215M.
The 180 Accubonds and 180 TSX seem to put 2 bullets touching and one of the 3 seems to stray from formation.
I'm not too keen on using the A-max for Elk. Anybody have any pet recipe's they would be willing to share?
Looking forward to your knowledge base,
Victor, your rifle sounds awesome. I have some brand new 300 WSM Norma brass if you want them. I have about 198 pieces. I was going to build a 300WSM project, however, I switched to a 6x284 instead. If you want them, I will give you a good deal.
If you want them, e-mail me at; firstname.lastname@example.org. If anybody else wants them, let me too. I will give Victor, first shot.
I have a Win M70 with a Obermeyer 25" fluted #5 barrel w/ Vais brake bedded in a McMillan sporter stock that was built by Mike Bryant and it weighs 9lbs with scope.
I haven't put but 100 rds thru it but it likes the 180 NBT with 60grs of AA4350, velocity is 2968fps and will put 3 into 1.5" at 300yds and wacks a 10"x13" steel target sub moa precision consistently at 600yds shooting off a backpack and a beanbag on the rear.
This should prove adequate for the coues whitetail hunt this year but for elk I hope the 180 Accubonds shoot this good as that would be my go to load as soon as I get a chance to try them.
I think the NBT would hold up better than the A-max but I too would be leery of using them for elk.
Wayne aka WAMBO
What is AA4350, Not familiar with it. Is it a Winchester powder?
From past experience of switching out Accubonds and Balistic Tips, I see no difference in my .270Wby. Both bullets have same point of impact, so odds are good that you will have luck with the accubonds.
I used up the last of my 180 Accubonds the other day but got a real good group with the last batch. I first used Norma Brass, 210M primers, MRP-69.0, & 180AB and got a 3/4" 3 shot group (100yds). Then I adjusted it a little - MRP-68.8, 180AB, 215M primer, and it shrunk my group to 3/8". When I get my next batch of bullets I will have to repeat that load and chornagraph it. The load with 69.0gr of MRP clocked at 2,989, 3,006 & 3,011 FPS.
By the way, I have found that Norma brass has thicker necks than the Winchester. I use a .336 neck bushing. It squeezes the neck just fine on the Norma, but the Win brass seems to go thru without any force at all. There is definitely a difference.
One other observation I made was that after firing, something happens to the shoulder where it binds the bolt when I reinsert the empty fired brass in the chamber. I have to use a body die to bump that shoulder back just a tiny bit. The brass goes into the body die without force, but right at the very end, it stops the ram. I could see about a .005 gap between the shell holder and the body die. I then have to put substantail force on the lever to force the brass up into the die. After that operation, the brass cycles into the chamber with ease.
I normaly reload Wby loads and I have never had such a situation like this before. With Weatherby's It's the blasted belted rim that always expanded and the primer pockets opened up really fast and shortened case life to about 6 reloads or less. I went to a beltless cartridge to get away from the Wby problems, but it seems every cartridge has its quirks. Do you find that you have to full length resize your 300WSM brass?