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Posted: 11/19/2010 11:17:26 AM EDT
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I just started loading 270.
I am using a 110gr. Barnes TTSX Boattail. I started 2 grains under max load. (58 Grains of H414) and got flattened primers. I dropped to 57gr that flattened the primers, then tried 56gr and that also flattened the primers. The min. was 55gr. The C.O.L was 3.590" Here is a pic is there somthing else I could look at? 
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That charge seems high to me. I don't have any Barnes load data in front of me, but looking at Hodgedon's reloading data center. Hodgedon doesn't list data for the 110 TSX, but they do list data for a 110gr hornady, which will be shorter and take up even LESS case capacity than the TSX, and lists the min as 51 and the max as 55. I would bet that the max for the long TSX would be even lower, due to the lowered case capacity.
Where is your load data from? |
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Brand new Winchester brass is worse than the brass I pick up at the range. That's from personal experience, but lets get to the problem at hand.
Did you size and trim the brass to proper spec's? This needs to be done more to size the neck than the body of the case, but I take nothing for granted. As for your load I would check with several sources for min and max loads. Is your brass clean and free of any lubricant, and if so is your chamber of your rifle similarly clean? Do these things and then retest. |
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That charge seems high to me. I don't have any Barnes load data in front of me, but looking at Hodgedon's reloading data center. Hodgedon doesn't list data for the 110 TSX, but they do list data for a 110gr hornady, which will be shorter and take up even LESS case capacity than the TSX, and lists the min as 51 and the max as 55. I would bet that the max for the long TSX would be even lower, due to the lowered case capacity. Where is your load data from? ^^^^^^^ This... Consult with Barnes for recommended load data for your .270 application. Don't worry too much about your flattened primers. I have some .270 winchester factory round hulls that I picked up at the range that have flatttened primers. [ETA}As good practice, you should size and trim new brass, because there are no spec.s that say new brass is right sized. |
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What kind of rifle are you shooting? Winchester Brass is fine. Iv used it alot. Your rifle may have a short throat... double check OAL and brass ( i know you prolly already have) Old or New rifle? Do you know your headspace? Could be any of those. Savage 116 Brand new Oal is 3.2" on all loaded rounds. Don't know headspace. |
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That charge seems high to me. I don't have any Barnes load data in front of me, but looking at Hodgedon's reloading data center. Hodgedon doesn't list data for the 110 TSX, but they do list data for a 110gr hornady, which will be shorter and take up even LESS case capacity than the TSX, and lists the min as 51 and the max as 55. I would bet that the max for the long TSX would be even lower, due to the lowered case capacity. Where is your load data from? ^^^^^^^ This... Consult with Barnes for recommended load data for your .270 application. Don't worry too much about your flattened primers. I have some .270 winchester factory round hulls that I picked up at the range that have flatttened primers. As good practice, you should size and trim new brass new brass, because there are no spec.s that say new brass is right sized. New brass should be sized and trimed if needed. What primers you using? |
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I like Win 760 for my 270. Same as H414. With the bullet you are using and that power I would start at 52grs.
You might need to go lower. Then work up .3grs at a time. I also would use CCI magnum primers. Just my 2 cents. But i've split cases and not flatten primers in my 270. I load 150gr bullets and I like then hot. |
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Deprime several cases you have fired from each of the various charge weights. DO NOT mix them with other charge weight fired primers.
Look at the profile of the primer in good light to see how much the radius of the primer's rounded edge has been removed at the base of the primer due to flowing out toward the inside rim of the hole. Even charges that are midway between min. & max. weight will usually remove some of that radius as being removed, obviously due to pressure. What you DO NOT want is a primer that has extruded/flowed to the wall of the primer pocket. If you have that condition, you will most likely also have pierced primers & cratering of the primer where the firing pin has struck the primer. Your picture is not clear enough to see if the primer has flowed/extruded enough to indicate excessive pressure. Contrast fired factory 110gr. rounds primers with yours. That should give you an idea of your pressure verses the factory pressures. Let us know what you learn about the primers. |
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Show us a photo of a flattened primer in your cases.
I'm reading from your first post that the Barnes data has 60 grains listed as the maximum charge weight. Please double check your book to make sure you're reading the correct line for H414, and while you're at it, make sure you're looking at the right cartridge, I'm wondering if you accidentally checked .270 Winchester Short Magnum data. The .270 WSM is a higher pressure cartridge for starters, and I think the case will hold more gunpowder, too. However unlikely, it's not all that hard to get on the wrong page of data; I've done it, and I expect I'll do it again. I'll just throw out there that I wouldn't be a bit surprised that 58 grains is hot with that bullet (even if you did pick it off the correct table of load data). Maybe even 55 grains. |
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The fired primer on the left appears to have extruded/flowed a bit more than the fired primer on the right. It that correct?
The right primer appears to have flowed about half the way toward the edge of the ring that surrounds the primer pocket. Is that correct? The primer on the right, to me, seems to show pressure that I would not consider excessive. Both fired primers appear to have a bit of extrusion around where they were struck by the firing pin. Can't be sure due to the lighting & angle the pics were taken. If the firing pin hole in the bolt face is more than a bit larger than the firing pin, primer metal can extrude into that area, causing that effect. Does it appear that the bottom of the primers have pushed back against the firing pin, & flowed a bit toward the rear? Your pics are better here. Thanks. |
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The fired primer on the left appears to have extruded/flowed a bit more than the fired primer on the right. It that correct? The right primer appears to have flowed about half the way toward the edge of the ring that surrounds the primer pocket. Is that correct? The primer on the right, to me, seems to show pressure that I would not consider excessive. Both fired primers appear to have a bit of extrusion around where they were struck by the firing pin. Can't be sure due to the lighting & angle the pics were taken. If the firing pin hole in the bolt face is more than a bit larger than the firing pin, primer metal can extrude into that area, causing that effect. Does it appear that the bottom of the primers have pushed back against the firing pin, & flowed a bit toward the rear? Your pics are better here. Thanks. Yeah the firing pin hits did crate a little. Thanks for the info guys. In not too worried about it. I just have some tinkering to do then I guess. Posted Via AR15.Com Mobile |
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Heres a pic of 2 unfired and 2 fired I let my camera focus a little longer this time: <a href="http://d.imagehost.org/view/0348/270" target="_blank">http://d.imagehost.org/0348/270.jpg</a> Why does that unfired primer look odd? |
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A quick look on the Hodgdon site shows some interesting data: http://data.hodgdon.com/cartridge_load.asp It shows a start load of 51.0 gr and a max load of 55.0 gr. for 110 gr bullets. Might want to recheck your data or look at other sources.... |
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Heres a pic of 2 unfired and 2 fired I let my camera focus a little longer this time: <a href="http://d.imagehost.org/view/0348/270" target="_blank">http://d.imagehost.org/0348/270.jpg</a> Why does that unfired primer look odd? It may just be the light, but I think I see a primer crimp ring which would very odd for a .270. The OP is using large rifle primers, right? |
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