M70 270 Weatherby Range report.

jmad_81

Handloader
Feb 14, 2007
2,945
27
Well, it turns out that This one likes RL-22 more than it does 7828. I was able to get a group this morning around the 1" mark with RL-22 and some 140 BT. I don't now how fast they were going, but I'm guessing around 3250. I think I can tweak the COAL a bit and get it to do close to .5". We'll see. I still have two loads with H1000 that I want to try tomorrow. I might load up the 72 gr RL-22 load again tonight and shoot it again as well.

One thing I have noticed about both the M70 and the Mark V is I seem to get a lot of groups that go two and one, but the one is sometimes up to 4" out while the two are dange near cutting. Is this because of the free bore? Is it common in weatherby chambers? It doesn't seem to matter what Powder I'm using either.

Whats your thoughts?
 
Ok, I'm not sure what is going on, but I can't attach any pics. I get a message saying something about a board attachment quota being met? Anybody know anything about this?
 
My wood-stocked MK V in .300Bee would toss the 1st shot 2" high and left from any other following shots. I had the barrel channel scraped-out and that cured it ... for awhile. Then It went to doin' it again. More scraping cured it again, finally that fixed it, with hand-loads going into an inch at 100 yds.

Don't know where that rifle is now, as I thought I needed something else, again!!!!!!


Jim
 
jmad_81":36ms7jmj said:
..............

One thing I have noticed about both the M70 and the Mark V is I seem to get a lot of groups that go two and one, but the one is sometimes up to 4" out while the two are dange near cutting. Is this because of the free bore? Is it common in weatherby chambers? It doesn't seem to matter what Powder I'm using either.

Whats your thoughts?

Most likely bedding. Does it have the clear hot glue bubble gun bedding?
 
The M70 has been bedded, and I have not looked at the Mark V. The thing that makes me think it is not bedding is that they are both doing it. We'll see as I keep playing with it. I have some more of the 71 gr RL-22 140 BT loads made up with different seating depths to try. I'll keep you posted.
 
The .270 Bee Model 70 Sporter's were all USRAC rifles with hot melt glue bedding, I believe. That may be your issue? I had to Accraglass my .30-06, USRAC made about that same time (>1990's). The hot melt bedding easiliy pulled out with needle nosed pliers, leaving no residue.
 
This has been properly bedded with what looks like accraglass. They guy has a good reputation in the area for doing good work.
 
How are your dies, are they producing good ammo with reasonable bullet runout? Could be a reason both guns are getting fliers.
 
Jake,

SInce its not bedding, what about the rest? What are you using?

JD338
 
Scope, mounts or rings maybe?

Sounds like bedding and what I am seeing right now with my .257 Roberts. The barrel channel keeps swelling and touching on the transition area where it should not.
 
I'm using sand bags off if a very steady bench. And I have double checked all rings amd bases.

The barrel is free floated with plenty of clearance from tip to the bedding. Only a few inches of barrel are supported by the bedding. It's not just the M70 that is doing it. The Mark V is doing it worse until you hit the sweet spot. Then they both seem to shoot.

I was just wondering it it had to do more with the free bore. Seems like I get the two and one curse whenever i can't get close to the lands, not just these two. My STW does it as well. I have no doubt I'll get them shooting better.

Thanks for all the help. I'll hopefully have another range report tomorrow.
 
Good luck Jake. I imagine you will get it sorted out. I would give it a ton of time between shots and see if that helps it. Recheck the Torque settings on the action screws as well. Make sure they are set to 30-35 InLb's..

Sounds like it is coming along fine though. Looking forward to seeing it all set up.

I was going to mention bedding as well, as my 264 did the same till I bedded it. After that, it still did it a little, till I found RL25. RL25 calmed it way down.
 
It sounds goofy but I finally got much better results with my .340 Weatherby when I switched to Forster dies. Forster was the only die set that put my double case shoulder and neck radiuses where they belonged (per dial indicator) and gave me precise and repeatable headspace datum control when FL resizing. I sat down before and after and made a 10X engineering layout of the resized case with a gage setup and dial indicator and blueprinted it. The Forster dies put it back in specification. The .340 Weatherby case does not have a straight line datum intersect, it is the tangent point of two radiuses intersecting.

I also had issues with the Fibermark stock not being dimensionally stable and despite glass bedding the recoil lug, still having a moving gap (freefloat) in the stock forend. The only device in the Mark V Fibermark stock which controlled the barrelled action position in the stock was two small glass bedded lands on the stock surface in the action ring cutout which spontaneously broke off of the plastic stock surface. I put a properly bedded (Taper #2) Euromark stock on the rifle and all this floating freefloat business stopped. The rifle than started shooting sub MOA groups.
 
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