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Best to start off slow! that way you don't wear yourself out! grin
interesting info! thanks for posting it up!
Paul
I can't spell... Deal with it...
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Dang that 260AI is sexy and I've a Rock .264 barrel on the way. That AI body is like a Siren's call though I know it may cause feeding issues. Perhaps a center feed DBM of some make. Hmmmm.
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Feeding from a Rem 700 SA is not bad. I use the SAUM follower. It allows 4 down and feeds pretty well. I polish the follower, feed ramp and bottom of the rails really well. You can feel it coming out of the magazine for sure, but no problem.
Bob
I met a French guy the other day. I asked him "Do you speak German?" He said "No." I said "You're welcome!"
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Here are pictures of the before and after cases. This .260 case before fire forming weighs 160.9 grs empty. This fire formed .260 AI case weighs 160.5 grs empty. Ok I have to ask where did the .4 grs go? just blow out the end of the barrel? You do realize it's the same piece of brass right? just different dimensions but the same amount of brass. You might want to check your scales. Unless it was not the same case and your cases are varying that much in weight.
Last edited by joecool544; 03/05/11.
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Ok I have to ask where did the .4 grs go? just blow out the end of the barrel? You do realize it's the same piece of brass right? just different dimensions but the same amount of brass. You might want to check your scales. Unless it was not the same case and your cases are varying that much in weight. Actually it's not the same piece of brass. I weighed a standard .260 and a formed .260AI empty and then filled with water. The two pieces of brass weighed .4 grs different. Sorry for the confusion. Bob
I met a French guy the other day. I asked him "Do you speak German?" He said "No." I said "You're welcome!"
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If you wanted to get real anal the AI'd case is likely a hair shorter than the parent case. The capacity of that length difference is just bullet at like OAL, LOL.
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I'll flip flop a bunch before I get all the components in the smith's hands and commit,LOL.
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I've owned two rifles in this chambering, my experience has been mixed with highs and lows. Accuracy seemed ok, but not exceptional. Fire forming brass is pretty straight forward and case life was very good. The last rifle has fouling problems, after a few rounds, the groups grow exponentially and is not reliably accurate. Therefore, this rifle is awaiting a new barrel and will be chambered in 6.5X47 Lapua. The 260 rem bests the velocity of this chambering by 100 or so fps but the Lapua is far more accurate and close to the same velocity with smaller case capacity.
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Lapua is far more accurate and close to the same velocity with smaller case capacity. At higher pressures. Why don't you try out some the new Lapua 260 Rem brass.
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I can't wait for that stuff to get out!
I am going to ream my 260 to 260AI, main reason is that I don't have a 260 die and I do have a 260AI die. The neck on my 260 is .294 and I hate it. The neck on my AI is .297 or 298 which will work with available brass better. I am waiting for the new Lapua stuff to come out before I do it to see if it works 'as is' before I tear this sucker down!
NRA Benefactor Member
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Any idea in how long before Lapua 260 brass is out?
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Graph's says April. I put in a order.
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I thought long and hard about an AI. The fireforming and only about 100fps gain wasn't worth it to me. Terry Cross shot an AI but since switched back to straight 260.
I spoke with Terry Cross a bit yesterday and brought up the 260/260AI. I want to be careful not to butcher what he articulated so take what I write with a grain of salt. The gist I got is that he like to run his 139/140 grain bullets near 2900 fps(26" barrel). With better brass being available, Norma and now Lapua, He can run higher pressures and still keep tight primer pockets with the 260 and reach those velocities. Also a rifle that feeds well may not do so in under the rigors of the field and competition and the standard 260 has a marked advantage there. FWIW.
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I've done some research to answer my own question: the 260AI shows a 5% gain in capacity. Given that, one could expect a 1% - 2% gain in velocity (25 - 50 fps), given similar chamber pressures. If you're doing better than that you're shoving more stuffing in the turkey, which can be done with either chambering.
Ackley himself wasn't too strong on the 6.5-08AI. But if it turns your crank, go ahead. I can give some actual data on the capacity differences. I built my very first one in 1979 while in gunsmith school and quite a few since then. I corresponded with Ackley by mail about the first one. He even sent me some load data from the Prowley Ballistic Calculator. They were way too hot! Here are pictures of the before and after cases. This .260 case before fire forming weighs 160.9 grs empty. This fire formed .260 AI case weighs 160.5 grs empty. The plain .260 weighs 212.3 grs full of water. The .260 AI weighs 217.3 grs full of water. The water weights for these cases are � 212.3 � 160.9 = 51.4 grs for the standard .260 217.3 � 160.5 = 56.8 grs for the .260 AI This gives of 5.4 grs or 10.5% increased capacity. (5.4 divided by 51.4 = 10.5%) Sorry for the bad pictures. For what it's worth, the .260 AI performs great and case life is terrific, i.e. - 10 + loadings. Bob PS - My first post. Which translates to about 60 fps, given equal pressures.
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Which translates to about 60 fps, given equal pressures.
True, and if I was running an 260 AI the first powder I would try would be RL25 to take advantage of that little more capacity. I would bet 2,900 with a 140 at equal pressure.
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Campfire 'Bwana
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Here's the results of a 100 grain ballistic tip that left the Muzzle at 3350 fps... and met a 175lb blacktail at 125 yds... this was out of a plain old factory Ruger 77 Mk2. in 260 Rem...
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