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> .280ai poor speeds
.280ai poor speeds
@ 12:17 am (GMT) |
Grant HarrisHi Nathan,Grunta here. Just posting a SOS call for a mate. He's got a kimber 280ai and he's got it shooting sweet with 150gr ballistic tips and 150gr nosler accubonds (longrange) but he's getting real poor velocities out of it. It's had 100 rounds through it now so the barrel should have settled by now. He's gone to 4grs over max with 2213sc and is only getting 2869fps. This has been verified by 2 diff chronys so its not a chrony issue. He's tried other powders as well to no avail. I'm dumbfounded as to why its so slow. Any ideas? Cheers, G |
Replies
@ 03:30 pm (GMT) |
Nathan FosterRe: .280ai poor speedsHi Grunta, from what you have described, your mate has just about run out of case capacity. He will need to switch to ADI 2209 (H4350) as you have done in your rifle. This will be much more responsive.Always hard to say why a rifle is slow. Could be chamber dimensions and head space, could be throat length if a separate throat reamer was used and the operator went too far. It could be the actual bore dimensions. I do not think this is a major. ADI 2213sc does its best work with heavy bullets. I mentioned this in the knowledge base and have just gone back through the .280 Rem text to make sure this is fully clarified. |
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@ 12:25 am (GMT) |
Grant HarrisRe: .280ai poor speedsThanks Nathan. As long as the accuracy is there I think he'll be happy, but just a little disappointing. He did some more testing today with 140gr Nosler Abs and BTs and got them to 3000fps with 6gr over max with 2213. Not really the performance he was looking for with the 280ai but o well, its a kimber that shoots - so thats always a bonus! lol |
@ 01:43 am (GMT) |
Bob MavinRe: .280ai poor speedsG’day grantAs Nathan said. Maybe reduce the volume of powder and try a quicker burn rate powder like 2209. I’m confused with your 2213sc load being 6gns over max? A compressed load of 62gns (ADI book) says 3010fps. Maybe check your scales? 6gns is a lot of extra powder to fit on an already compressed load. Cheers Bob |
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@ 01:54 am (GMT) |
Grant HarrisRe: .280ai poor speedsHi Bob,Thanks for the reply. Its not my rifle, it's a mates and he's doing the reloading for it. He's quite fastidious so I would assume he's correct with it being that far over. I'm currently shooting 5gr over max with 2209 in my .270 so it is possible - no pressure signs what so ever - same with my mate - no pressure signs. It's just unfortunate that he's not getting the full effects of a 280ai - especially since he went from his beloved 7mm rem mag to it. It's a nice rifle and extremely light, but I don't think I'd buy one. Cheers, G |
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@ 02:29 am (GMT) |
Bob MavinRe: .280ai poor speedsG’day GrantI still think 2209 is worth a try (in a 24" barrel) rather than compressing powder. ADI says 62gns is compressed so another 6gns is a lot more that’s why I questioned the scales. 280AI needs a 26” barrel to get into the 3200fps with 140gn pills, if using a 24" barrel the extra 2213 powder will be burning outside the barrel. ADI say 3010fps with max 62gns C for 3010fps with a 24” barrel 140gn pill. All the best Bob |
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@ 05:51 am (GMT) |
Bob MavinRe: .280ai poor speedsPS. I'm not much of a writer. Incase my previous post isn’t clear? I don’t like heavily compressed loads (for various reasons). If you can’t get what you expected with a compressed load, go to a faster burning and less amount of powder. The powder needs to completely burn inside the barrel length. To get the best from a 280 AI, you need a long barrel (26”) and a slower powder (say 2213sc) to get max velocity. With a shorter barrel say 24” min, use a faster powder (2209). If the powder is too slow it burns up outside the barrel, wasting energy. Cheers Bob |
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@ 01:06 pm (GMT) |
Grant HarrisRe: .280ai poor speedsI appreciate your feedback and explanation Bob, makes sense what your saying. I've sent him an email suggestion 2209 again and I'll give him some 2209 to try out when I next see him. Originally he was hesitant to try 2209 as someone mentioned to him thats its not as stable as 2213 but I'm sure it wont be a problem.Cheers, Grant |
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@ 03:25 pm (GMT) |
Bob MavinRe: .280ai poor speedsG’day GrantI hope you get what your after mate. It all depends on his barrel length, at 26” 2213sc or slower AR2217, RL 19 or RL 22 should be the powder to use. If his barrel is only 24” 2209 is worth a try. Keep us posted please mate. Bob |
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@ 11:47 pm (GMT) |
Grant HarrisRe: .280ai poor speedsHis barrel is 24". He's going to give 2209. I'll post the results - hopefully happy ones.Cheers, G |
@ 03:04 am (GMT) |
geoff hintonRe: .280ai poor speedsGidday,I have done some load dev for a nosler 280ai. 24inch barrel. Using nosler custom brass with a fed gold primer I am getting 3085 fps with 63 grain of RL22 behind an accubond 140grain. Thats almost identical to the speed from the nosler custom ammo. 60 grain of RL22 gives me 2885 Tried 2213sc with the same proj and got 2877 with 60 grain of that. Hope that is helpful |
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@ 01:38 am (GMT) |
Grant HarrisRe: .280ai poor speedsHi Geoff,Thanks for the info - I'll pass it on. Just received an email from him saying he's got 4 test pots of powder to try so I'll see if RL22 is among them. I'll keep updating as I get more results. G |
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