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Reloading Techniques For Reloading


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270 AM 169RBBTs

 
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  #1  
Old 12-04-2007, 09:00 PM
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270 AM 169RBBTs

Anybody tried IMR 7828 SSC in a .270AM? I was wondering if the short kernals would negate any pressure/bridging problems. How about Thunderbird T870? I just got the gun today and got some 872 with it, but was just wondering if there were any alternatives.
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Old 12-04-2007, 09:48 PM
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So that answers my ??? s why AVMCGEE. has not reponded to my ??s or email. What scope was it and what barrel maker /twist.

I can,t help on the loads. I would like to see a picture though.

Congrats on a nice gun. I would think Kirby can help you with loads. PM him if you don't get a response.
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  #3  
Old 12-04-2007, 11:33 PM
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Surplus powders that work well are WC872 and WC860. I have not personally used 860 but I have some customers that have.

With the 169.5 gr ULD RBBT, there are several commerical powders that work well also. Retumbo is probably the very best. US869 also works well but its a bit sensitive to temp changes as are the surplus powders.

Rl-25 should also be usible but you will need to watch as you can pressure out easily with this class of powder.

I have not used 7828 SSC but it is similiar in burn rate so it would probably work as well with a properly developed load.

I have not used T870 but it to would well as its a very slow burning powder. I have no load data for it.

Retumbo is the very best powder out there for the 7mm RUM with 140 to 160 gr bullets. It works just as well for the 270 AM with 169.5 gr bullets.

Kirby Allen(50)
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  #4  
Old 12-05-2007, 01:07 AM
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When US869 first came out i grabbed a 8lb container of it and went to work. As with alot of powders when they first came out it differed a decent amount in burn rates from one lot to another. My lot was VERY fast and hard on brass. i used it none the less and in a 30" bbl i was able to have enough speed to have a 100yd zero and for 1000yds i only needed 14.5 moa for a bullseye!!!!!!!!! last time i checked i think exbal said the velo was around 3450fps!!! Now this brass wouldnt last long and in warm temps it was a stiff bolt throw but in my gun it shot damn well.

In my current 270AM I think my load is 97grs of 869 at around 3280, more than enough to take down anything i want and a heck of alot easier on brass. This is also a 27" bbl.

just my 2 cents
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  #5  
Old 12-05-2007, 08:33 AM
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Thanks for the info.

I have had a little confusion regarding WC872, here is my take on it. It is a surplus sperical ball powder that is marketed as a replacement for the now extinct H870, and uses the same load data. (basically the same powder that H marketed until the supply ran out) T870 also falls into the same catagory.
869 on the otherhand is the powder that Hodgdon is marketing as the "new" 870 and it is not surplus powder.

Is that correct?

I looked at T870 compared to WC872 and it looks pretty much the same except T870 has fewer of the not quite round powder kernals. I have used both of these powders in a 300wby and got much greater velocities w/o pressure signs using my lot of T870. I do not know if the circumstances will be the same with the 270AM, but I am going to find out today. I am thinking the lot of T870 that I own is a little slower than the previous lot of WC872 that I used.
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Old 12-05-2007, 09:15 AM
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Quote:
Originally Posted by eddybo View Post
for the now extinct H870
It may no longer be produced but you can still get it. I talked with a guy the other day who has close to 100 lbs. $84.00 for 8lbs.
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  #7  
Old 12-05-2007, 09:20 AM
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I have seen lots of 872 that were not much slower then Retumbo and others that were even a bit slower then H50BMG. Thats why I generally only give starting loads and tell customers to work up over a chronograph to know what you have instead of thinking you know.

I would say T870 would be very usible as well and similiar in burn rate, starting loads for both should be safe .

Kirby Allen(50)
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