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Lands vs. magazine length, browning A bolt 270

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Unread 08-23-2013, 10:42 AM
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Join Date: Dec 2012
Posts: 598
Re: Lands vs. magazine length, browning A bolt 270

No you dont have to take it out. Just be careful with your dremel and get the high speed cutters that will fit as good as you can along side the rivet. I most of the time end up taking off part of the sides of the rivets before things are done. One thing also to think of is you will need two cutter. They will eventually fill with the aluminum and quit cutting. With two you can switch and keep them cool to prevent this. All you need is two verticle channels one on each side of the rivets. It is not to tough to get it smooth, and works great.
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Unread 08-23-2013, 11:08 AM
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Join Date: Mar 2008
Location: SD
Posts: 334
Re: Lands vs. magazine length, browning A bolt 270

Originally Posted by fireworks View Post
Hunt the distance thanks for the tip. I assume you need to mill down the back of the spacer and re install so they glide?
I loaded 3 rounds at 0.005 off, 0.010, 0.015 and 0.020 with 56 grains imr 7838. Low velocity all around but 57 grains will fill to the neck so I'm thinking the ssc may be the ticket. Forget any others, rl 22, 4831...4350... a snowballs chance in getting those but the imr 7828 in both forms are available in my area. Here's my trouble, no matter the seat, I can put two of three inside a dime but the 3rd is in left field, off 2 to 3 inches and it is not just the first or "cold shot". I clean after ever 3 round group. Two so tight you smile... one in siberia. I' m using standard remington lg. Primers due to area availability. Do mag primers such as federal 215 make that much difference? I've ran 70 rounds of a 100 round box and I fear I may not be able to luck onto another even IF I figure this out.
I load every round by hand weighing with a didgital scale and use a lee handloader and caliper every load precise. Even went so far as to check my scope to see if it's taking recoil.
Frustrated! At this point I'm thinking of switching to berger 150 VLD. Any further pointers are appreciated.

The brownings I have worked with all start flying after the 3rd shot. Maybe some don't but the ones I have dealt with all do. I would be happy with the 3. I used to be consumed with 5 shots on big guns.
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Unread 08-25-2013, 02:11 PM
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Join Date: Aug 2013
Location: wyoming
Posts: 22
Re: Lands vs. magazine length, browning A bolt 270

Well I think I dialed it in. This gun likes the berger vld 150 gr. at 56.5 gr. Imr 7828 ssc at 0.020 off. 3 shots at 100 yds. You can can cover with a dime. One shot was actually partially inside one of the others. Not bad using a prone position bi pod. When I added up the three chrono's and devided by 3 the mean FPS was 2912 with a 22 inch barrel. I tried bumping to 57 grains and it started to separate and the mean FPS was not much better. Then I tried the 150 gr. Nosler ABLR. Ironically. The lands are virtually the same as the bergers so I went with 0.020 off as well but since they are a longer bullet I backed off to 56.0 grains. The group could be covered with a quarter but the wind was also picking up. Couple that with the fact I was again shooting prone off my bi pod I figured good enough. Here is the real irony... mean average FPS three shot group? 2912 same as the bergers? Go figure. I believe I could mess around with the charge and the BOSS brake and get the magical 3000 FPS but I don't see much point. This I feel is very good considering the 22'' barrel. Time to send the data and scope to leupold.
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